04_aws_open_data_registry.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<img src='./img/opengeohub_logo.png' alt='OpenGeoHub Logo' align='right' width='15%'></img>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<a href=\"./00_index.ipynb\"><< Index</a><br>\n",
    "<a href=\"./03_WEKEO_dias_service.ipynb\"><< 03 - WEkEO - Copernicus Data and Information Access Service</a><span style=\"float:right;\"><a href=\"./05_google_earth_engine.ipynb\">05 - Google Earth Engine>></a></span>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Amazon Web Services - Open Data Registry"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### About"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "[The Registry of Open Data on AWS](\"https://registry.opendata.aws/?search=tags:gis,earth%20observation,events,mapping,meteorological,environmental,transportation\") is a registry of open geospatial datasets on Amazon Web Services.\n",
    "Large volumes of geospatial data are made available as S3 storage buckets and are available for download or to directly load it in AWS processing services.\n",
    "\n",
    "Check out the program [Earth on AWS](https://aws.amazon.com/earth/) as well.\n",
    "\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Data"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "There is a variety of different `geospatial` data available. So far, the following Copernicus data are available:\n",
    "* [Sentinel-1](https://registry.opendata.aws/sentinel-1/)\n",
    "* [Sentinel-2](https://registry.opendata.aws/sentinel-2/)\n",
    "* [Sentinel-3](https://registry.opendata.aws/sentinel-3/)\n",
    "* [Sentinel-5P Level 2](https://registry.opendata.aws/sentinel5p/)\n",
    "\n",
    "\n",
    "* [ECMWF ERA-5 climate reanalysis](https://registry.opendata.aws/ecmwf-era5/)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### How to retrieve data?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "[boto3](https://boto3.amazonaws.com/v1/documentation/api/latest/index.html) is the Amazon Web Services (AWS) SDK for Python in order e.g. to access data on AWS S3 storage buckets.\n",
    "\n",
    "Follow the steps below for an example on how to use boto3 to retrieve data."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<hr>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### Load required libraries"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 36,
   "metadata": {},
   "outputs": [],
   "source": [
    "import boto3\n",
    "import botocore\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<hr>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Example to retrieve data with `boto3`"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 1. Initiate the a `boto3 client` with `boto3.client()` and define the bucket of your interest."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Initiate the a `s3` client and define `meeo-s5p` as your bucket of interest."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "client = boto3.client('s3', config=botocore.client.Config(signature_version=botocore.UNSIGNED))\n",
    "s5p_bucket = 'meeo-s5p'"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 2. Create a `paginator` and iterate of the results from the API request"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "`Paginators` are a feature of boto3 that act as an abstraction over the process of iterating over an entire result set of a truncated API operation. \n",
    "\n",
    "You must call the `paginate()` method of a Paginator in order to iterate over the pages of API operation results. "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<botocore.paginate.PageIterator at 0x7feda851e0b8>"
      ]
     },
     "execution_count": 14,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "paginator = client.get_paginator('list_objects_v2')\n",
    "results = paginator.paginate(Bucket=s5p_bucket, Delimiter='/')\n",
    "results"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "But the `paginator` object is just a `PageIterator`. In order to see the structure in which the data is organised on the S3 bucket, you have to iterate over the object: "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "COGT/\n",
      "NRTI/\n",
      "OFFL/\n",
      "RPRO/\n"
     ]
    }
   ],
   "source": [
    "for prefix in results.search('CommonPrefixes'):\n",
    "    print(prefix.get('Prefix'))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 3. Paginate over the PageIteror with a `Prefix` parameter"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Instead of the `Delimiter` keyword, the `paginate` function accepts also a `Prefix` parameter, which can be used to filter the paginated results by prefix on the server-side before sending them to the client:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "<botocore.paginate.PageIterator at 0x7feda851e160>"
      ]
     },
     "execution_count": 16,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "prefix=('COGT/OFFL/L3__NO2__')\n",
    "pages = paginator.paginate(Bucket=s5p_bucket, Prefix=prefix)\n",
    "pages"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "The next step is now to iterate over the `Contents` of each page of the PageIterator `pages`. Since the resulting object are dictionaries, we get a much cleaner output by just selecting the `dictionary key`. \n",
    "\n",
    "You see that the data are daily aggregates and for each day, there are three differenct COG files with the following endings:\n",
    "- `_4326`\n",
    "- `_mask50_4326`\n",
    "- `_mask75_4326`"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
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      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200717_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200718_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200718_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200718_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200718_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200720_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200720_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200720_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200720_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
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      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200721_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200721_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200722_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
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      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200723_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
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      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200724_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200724_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
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      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200725_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
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      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200726_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200726_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200726_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
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      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200727_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200727_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200728_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200728_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200728_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200728_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200729_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200729_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200729_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200729_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200730_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200730_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200730_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200730_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200731_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200731_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200731_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200731_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/07/_.json\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200801_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200801_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200801_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200801_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200802_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200802_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200802_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200802_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200803_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200803_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200803_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200803_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200804_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200804_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200804_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200804_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200805_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200805_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200805_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200805_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200806_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200806_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200806_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200806_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "COGT/OFFL/L3__NO2___/2020/08/_.json\n",
      "COGT/OFFL/L3__NO2___/2020/catalog.json\n",
      "COGT/OFFL/L3__NO2___/202003%/_.json\n",
      "COGT/OFFL/L3__NO2___/202004%/_.json\n",
      "COGT/OFFL/L3__NO2___/catalog.json\n"
     ]
    }
   ],
   "source": [
    "for page in pages:\n",
    "    for obj in page['Contents']:\n",
    "#        print(obj)\n",
    "        print(obj.get('Key'))"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 4. Store the `dictionary_keys` in a Python list"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Let us store the dictionary keys in a list with the name `key_list`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0\n",
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      "1\n",
      "COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200225_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "2\n",
      "COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200225_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "3\n",
      "COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200226_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "4\n",
      "COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200226_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "5\n",
      "COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200226_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "6\n",
      "COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200226_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "7\n",
      "COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200227_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "8\n",
      "COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200227_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "9\n",
      "COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200227_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "10\n",
      "COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200227_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "11\n",
      "COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200228_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "12\n",
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      "13\n",
      "COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200228_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "14\n",
      "COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200228_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "15\n",
      "COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200229_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "16\n",
      "COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200229_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "17\n",
      "COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200229_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "18\n",
      "COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200229_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "19\n",
      "COGT/OFFL/L3__NO2___/2020/02/catalog.json\n",
      "20\n",
      "COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200301_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "21\n",
      "COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200301_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "22\n",
      "COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200301_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "23\n",
      "COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200301_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "24\n",
      "COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200302_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "25\n",
      "COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200302_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "26\n",
      "COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200302_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "27\n",
      "COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200302_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "28\n",
      "COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200303_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "29\n",
      "COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200303_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "30\n",
      "COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200303_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "31\n",
      "COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200303_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "32\n",
      "COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200304_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "33\n",
      "COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200304_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "34\n",
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      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200721_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "590\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200721_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "591\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200722_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "592\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200722_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "593\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200722_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "594\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200722_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "595\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200723_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "596\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200723_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "597\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200723_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "598\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200723_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "599\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200724_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "600\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200724_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "601\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200724_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "602\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200724_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "603\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200725_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "604\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200725_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "605\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200725_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "606\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200725_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "607\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200726_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "608\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200726_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "609\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200726_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "610\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200726_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "611\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200727_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "612\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200727_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "613\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200727_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "614\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200727_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "615\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200728_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "616\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200728_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "617\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200728_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "618\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200728_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "619\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200729_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "620\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200729_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "621\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200729_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "622\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200729_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "623\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200730_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "624\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200730_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "625\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200730_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "626\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200730_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "627\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200731_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "628\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200731_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "629\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200731_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "630\n",
      "COGT/OFFL/L3__NO2___/2020/07/S5P_OFFL_L3__NO2____20200731_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "631\n",
      "COGT/OFFL/L3__NO2___/2020/07/_.json\n",
      "632\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200801_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "633\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200801_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "634\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200801_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "635\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200801_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "636\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200802_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "637\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200802_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "638\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200802_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "639\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200802_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "640\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200803_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "641\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200803_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "642\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200803_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "643\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200803_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "644\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200804_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "645\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200804_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "646\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200804_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "647\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200804_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "648\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200805_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "649\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200805_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "650\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200805_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "651\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200805_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "652\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200806_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.json\n",
      "653\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200806_PRODUCT_daily_nitrogendioxide_tropospheric_column_4326.tif\n",
      "654\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200806_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask50_4326.tif\n",
      "655\n",
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200806_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "656\n",
      "COGT/OFFL/L3__NO2___/2020/08/_.json\n",
      "657\n",
      "COGT/OFFL/L3__NO2___/2020/catalog.json\n",
      "658\n",
      "COGT/OFFL/L3__NO2___/202003%/_.json\n",
      "659\n",
      "COGT/OFFL/L3__NO2___/202004%/_.json\n",
      "660\n",
      "COGT/OFFL/L3__NO2___/catalog.json\n"
     ]
    }
   ],
   "source": [
    "i=0\n",
    "key_list=[]\n",
    "for page in pages:\n",
    "    for obj in page['Contents']:\n",
    "        print(i)\n",
    "        print(obj.get('Key'))\n",
    "        key_list.append(obj.get('Key'))\n",
    "        i=i+1"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 5. Filter the relevant files"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "With Sentinel-5P data, you are interested in a conservative cloud factor of at least 75%. Let us selected only the files with the ending `_mask75_4326.tif`. We can do this by filtering the list `key_list`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "['COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200225_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200226_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200227_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200228_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/02/S5P_OFFL_L3__NO2____20200229_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200301_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200302_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200303_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200304_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200305_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200306_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200307_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200308_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200309_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200310_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200311_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200312_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200313_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200314_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200315_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200316_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200317_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200318_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200319_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200320_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200321_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200322_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200323_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200324_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200325_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200326_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200327_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200328_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200329_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200330_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/03/S5P_OFFL_L3__NO2____20200331_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/04/S5P_OFFL_L3__NO2____20200401_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/04/S5P_OFFL_L3__NO2____20200402_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/04/S5P_OFFL_L3__NO2____20200403_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/04/S5P_OFFL_L3__NO2____20200404_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
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       " 'COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200801_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200802_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200803_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200804_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200805_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif',\n",
       " 'COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200806_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif']"
      ]
     },
     "execution_count": 29,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "selected_files = list(filter(lambda x: x.endswith('mask75_4326.tif'), key_list))\n",
    "selected_files"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "#### 6. Download the files of interest with `client.download_file()`"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Now you are ready to go to download the specific files. The client function `client.download_file` takes the bucket name, key name and output folder to download the data.\n",
    "\n",
    "For the example, we only select one image to download"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 34,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200806_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif'"
      ]
     },
     "execution_count": 34,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "selected_files[161]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 35,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "COGT/OFFL/L3__NO2___/2020/08/S5P_OFFL_L3__NO2____20200806_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n",
      "S5P_OFFL_L3__NO2____20200806_PRODUCT_daily_nitrogendioxide_tropospheric_column_mask75_4326.tif\n"
     ]
    }
   ],
   "source": [
    "for i in selected_files[161:162]:\n",
    "    print(i)\n",
    "    tmp = i.split('/')\n",
    "    print(tmp[5])\n",
    "    client.download_file(s5p_bucket, i, './'+tmp[5])"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<a href=\"./03_WEKEO_dias_service.ipynb\"><< 03 - WEkEO - Copernicus Data and Information Access Service</a><span style=\"float:right;\"><a href=\"./05_google_earth_engine.ipynb\">05 - Google Earth Engine>></a></span><br>\n",
    "<a href=\"./00_index.ipynb\"><< Index</a>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<hr>\n",
    "&copy; 2020 | Julia Wagemann\n",
    "<a rel=\"license\" href=\"http://creativecommons.org/licenses/by/4.0/\"><img style=\"float: right\" alt=\"Creative Commons Lizenzvertrag\" style=\"border-width:0\" src=\"https://i.creativecommons.org/l/by/4.0/88x31.png\" /></a>"
   ]
  }
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