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run_DEM_EUDEMv11.py
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run_DEM_EUDEMv11.py
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'''Python for Processing Digital Elevation Models (DEMs).
Author: He Zhang @ University of Exeter
Date: 16th March 2019 (Update: 20th April 2019)
Contact: hz298@exeter.ac.uk zhangheupc@126.com
Copyright (c) 2019 He Zhang
'''
'''
DEM Data:
EUDEMv11 - EU-DEMv1.1
Download Link: https://land.copernicus.eu/imagery-in-situ/eu-dem/eu-dem-v1.1
Terms and Abbreviations:
EPSG - European Petroleum Survey Group
GCS - Geographic Coordinate System (Identified by an unique EPSG code)
PCS - Projected Coordinate System (Identified by an unique EPSG code)
WGS-84 [EPSG 4326] - 1984 World Geodetic System [GCS]
Merc [EPSG 3857] - Mercator -> Web Mercator -> Pseudo Mercator [PCS of WGS-84]
OSGB-36 [EPSG 4277] - 1936 Ordnance Survey Great Britain [GCS]
BNG [EPSG 27700] - British National Grid [PCS of OSGB-36]
ETRS-89 [EPSG 4258] - 1989 European Terrestrial Reference System [GCS]
LAEA [EPSG 3035] - Lambert Azimuthal Equal-Area [PCS of ETRS-89]
lat - Latitude
lng - Longitude
Transform - GCS to GCS
Project - GCS to PCS, PCS to PCS
Convert - PCS to PCS
Functions:
Convert DEM from LAEA PCS to ETRS-89 GCS.
Transform DEM from ETRS-89 GCS to WGS-84 GCS.
Transform DEM from ETRS-89 GCS to OSGB-36 GCS.
Get the elevation from DEM in WGS-84 GCS.
Get the elevation from DEM in OSGB-36 GCS.
Get the elevation from DEM in ETRS-89 GCS.
******************** Important Information of Code Usage ********************
- Use 'GDAL.GetProjection()' to check the GCS/PCS information of DEM (in TIF format).
- Use 'GDAL.GetGeoTransform()' to check the resolution of DEMs.
- Use 'GDAL.GetGeoTransform()' to check (lat, lng) of top-left corner of DEM (in GCS).
- The (lat, lng) of other locations in DEM can therefore be calculated.
- Each GCS has one related PCS (GCS/PCS is identified by an unique EPSG code).
- You can transform DEM between different GCSs (e.g., WGS-84 <-> OSGB-36 <-> ETRS-89).
- You can project DEM in GCS to the related PCS and then display its 2D image.
- You can not display DEM in GCS as 2D image (e.g., WGS-84 -> 2D image is wrong).
- You can not project DEM in GCS to the unrelated PCS (e.g., WGS-84 -> BNG is wrong).
- You can not project DEM between different PCSs (e.g., Pseudo Mercator <-> BNG is wrong).
* Use 'gdalwarp' command to transform/project DEM to different GCSs/PCSs might be correct.
'''
# Python 3.7
# import os
# import re
# import shutil
# import subprocess
# import matplotlib.pyplot as plt
import numpy as np
from osgeo import gdal
from pandas import read_csv
from pyDEM_function import get_dem_info
from pyDEM_function import get_elevation
# from pyDEM_function import get_file_names
# from pyDEM_function import show_2d_dem
from pyDEM_function import transprojcnvt_dem
# from pyDEM_function import write_dem
# Specify user settings.
# Set the EPSG code.
EPSG_WGS84 = 4326
EPSG_OSGB36 = 4277
EPSG_ETRS89 = 4258
EPSG_LAEA = 3035
# Set the format of DEMs.
DEM_FORMAT = '.tif'
# Set the path of DEMs.
PATH_EUDEM = 'DATA/DATA_EUDEMv11/'
# PATH_EUDEM_SOURCE = 'DATA/DATA_EUDEMv11/EPSG3035_s/' # The folder of source DEMs must exist.
# Set the name of DEMs in GCSs.
EUDEM_GCS_WD = 'EUDEMv11_EPSG4326.tif'
EUDEM_GCS_UK = 'EUDEMv11_EPSG4277.tif'
EUDEM_GCS_EU = 'EUDEMv11_EPSG4258.tif'
# Set the name of DEMs in PCSs.
EUDEM_PCS_WD = 'EUDEMv11_EPSG3857.tif'
EUDEM_PCS_UK = 'EUDEMv11_EPSG27700.tif'
EUDEM_PCS_EU = 'EUDEMv11_EPSG3035.tif'
# Set the path of location data file.
PATH_LD_STATION_DATA = 'DATA/DATA_LD_AirQuality/London_AirQuality_Stations.csv'
# <EUDEMv11> Convert DEM from LAEA PCS to ETRS-89 GCS.
print('\n>>> <EUDEMv11> Convert DEM from LAEA PCS to ETRS-89 GCS.')
path = PATH_EUDEM
dem_in = path + EUDEM_PCS_EU
dem_out = path + EUDEM_GCS_EU
epsg_in = EPSG_LAEA
epsg_out = EPSG_ETRS89
transprojcnvt_dem(dem_in, epsg_in, dem_out, epsg_out)
data = gdal.Open(dem_in)
get_dem_info(data, if_print=True)
data = gdal.Open(dem_out)
get_dem_info(data, if_print=True)
print('\n>>> Complete!\n')
# <EUDEMv11> Transform DEM from ETRS-89 GCS to WGS-84 GCS.
print('\n>>> <EUDEMv11> Transform DEM from ETRS-89 GCS to WGS-84 GCS.')
path = PATH_EUDEM
dem_in = path + EUDEM_GCS_EU
dem_out = path + EUDEM_GCS_WD
epsg_in = EPSG_ETRS89
epsg_out = EPSG_WGS84
transprojcnvt_dem(dem_in, epsg_in, dem_out, epsg_out)
data = gdal.Open(dem_in)
get_dem_info(data, if_print=True)
data = gdal.Open(dem_out)
get_dem_info(data, if_print=True)
print('\n>>> Complete!\n')
# <EUDEMv11> Transform DEM from ETRS-89 GCS to OSGB-36 GCS.
print('\n>>> <EUDEMv11> Transform DEM from ETRS-89 GCS to OSGB-36 GCS.')
path = PATH_EUDEM
dem_in = path + EUDEM_GCS_EU
dem_out = path + EUDEM_GCS_UK
epsg_in = EPSG_ETRS89
epsg_out = EPSG_OSGB36
transprojcnvt_dem(dem_in, epsg_in, dem_out, epsg_out)
data = gdal.Open(dem_in)
get_dem_info(data, if_print=True)
data = gdal.Open(dem_out)
get_dem_info(data, if_print=True)
print('\n>>> Complete!\n')
# Read London air quality monitoring station data file.
print('\n>>> Read London air quality monitoring station data file.')
site_data = read_csv(PATH_LD_STATION_DATA)
print(site_data.head(3))
site_num = site_data['SiteName'].count()
print('\n*==> The number of stations is: %d' % site_num)
# Get the latitude and longitude of stations.
site_latlng = np.zeros((site_num, 2))
site_latlng[:, 0] = site_data['Latitude'] # The 0-th column - Latitude.
site_latlng[:, 1] = site_data['Longitude'] # The 1-th column - Longitude.
np.set_printoptions(suppress=True) # Print numbers without scientific notation.
print('\n*==> The location (lat, lng) of stations are:\n', site_latlng)
print('\n>>> Complete!\n')
# <EUDEMv11> Get the elevation from DEM in WGS-84 GCS.
print('\n>>> <EUDEMv11> Get the elevation from DEM in WGS-84 GCS.')
dem_gcs = gdal.Open(PATH_EUDEM + EUDEM_GCS_WD)
get_dem_info(dem_gcs, if_print=True)
site_ele_eudem_wgs = get_elevation(dem_gcs, site_latlng)
np.set_printoptions(suppress=True)
print('\n*==> The elevation information of stations is:\n', site_ele_eudem_wgs)
print('\n*==> The elevation value of stations is:\n', site_ele_eudem_wgs[:, 5].astype(int))
print('\n>>> Complete!\n')
# <EUDEMv11> Get the elevation from DEM in OSGB-36 GCS.
print('\n>>> <EUDEMv11> Get the elevation from DEM in OSGB-36 GCS.')
dem_gcs = gdal.Open(PATH_EUDEM + EUDEM_GCS_UK)
get_dem_info(dem_gcs, if_print=True)
site_ele_eudem_osgb = get_elevation(dem_gcs, site_latlng)
np.set_printoptions(suppress=True)
print('\n*==> The elevation information of stations is:\n', site_ele_eudem_osgb)
print('\n*==> The elevation value of stations is:\n', site_ele_eudem_osgb[:, 5].astype(int))
print('\n>>> Complete!\n')
# <EUDEMv11> Get the elevation from DEM in ETRS-89 GCS.
print('\n>>> <EUDEMv11> Get the elevation from DEM in ETRS-89 GCS.')
dem_gcs = gdal.Open(PATH_EUDEM + EUDEM_GCS_EU)
get_dem_info(dem_gcs, if_print=True)
site_ele_eudem_etrs = get_elevation(dem_gcs, site_latlng)
np.set_printoptions(suppress=True)
print('\n*==> The elevation information of stations is:\n', site_ele_eudem_etrs)
print('\n*==> The elevation value of stations is:\n', site_ele_eudem_etrs[:, 5].astype(int))
print('\n>>> Complete!\n')
# Compare the elevation obtained from different DEMs.
print('\n>>> Compare the elevation obtained from different DEMs.')
print('\nEUDEMv11_WD', site_ele_eudem_wgs[:, 5].astype(int))
print('\nEUDEMv11_UK', site_ele_eudem_osgb[:, 5].astype(int))
print('\nEUDEMv11_EU', site_ele_eudem_etrs[:, 5].astype(int))
print('\n>>> Complete!\n')