Historical Maps for data.amsterdam.nl

Tools, scripts and data to generate tiles for data.amsterdam.nl from digitized historical maps from the Amsterdam City Archives.

This repository contains:

• JSON and GeoJSON data of map sheets, collected and georectified by Jan Hartmann
• Scripts to download map sheets from the Amsterdam City Archives
• GDAL scripts to warp these map sheets, combine them, and turn them into XYZ map tiles
• A Leaflet-based viewer to view the historical maps produced by this repository

Usage

All steps required to turn the map series in the source-data directory into XYZ map tiles are defined by the Makefile.

First, make sure you have GDAL and Node.js installed, then install the dependencies:

npm install

The Makefile has the following targets/steps:

• layers: combines georeference data from the source-data directory.
• gdal-scripts: uses the newline-delimited JSON data in the layers directory to create GDAL scripts.
• gdal: uses GDAL scripts from the gdal-scripts directory to download and warp map sheets.
• tiles: uses gdal2tiles.py and the GeoTIFFs and VRTs in the output directory to create XYZ map tiles.

To exectute one of these steps, use make. For example:

make layers

See Also

• https://github.com/Amsterdam/mapserver/blob/master/lufopyramids.sh
• https://gis.stackexchange.com/questions/27426/creating-a-mask-with-transparent-pixels-in-python
• http://www.gdal.org/frmt_gtiff.html
• https://smathermather.wordpress.com/2016/05/01/efficient-delivery-of-raster-data-part-4/
• https://smathermather.wordpress.com/2016/04/15/whichever-tiler-you-use-and-efficient-delivery-of-raster-data-image-pyramid-layer-update2/
• https://astuntech.atlassian.net/wiki/display/ISHAREHELP/Mosaic+thousands+of+raster+images
• http://blog.cleverelephant.ca/2015/02/geotiff-compression-for-dummies.html
• https://www.slidesearch.net/slide/geoserver-in-production-we-do-it-here-is-how-foss4g-2016
• https://www.mapbox.com/blog/super-sharp-pleiades-imagery-on-mapbox/
• https://github.com/boundlessgeo/workshops/blob/master/workshops/data_configs/sphinx/source/raster.rst
• http://www.ianturton.com/tutorials/bluemarble.html