jay
These helper scripts that download dependencies and run mapshaper on mixed geometry GeoPackage geography files
Assumptions
The GeoPackage data is in a projected rather than longitude and latitude coordinate system
Implementation
Running the simplify.sh script on the GeoPackage file input.gpkg to create a simplified input-simplified.gpkg in the output directory:
$ ./simplify.sh input.gpkg
The script installs a local python3 and nodejs environment and processes and creates simplified GeoPackage layer
dumpgeojson.py
Writes GeoPackage layer data as GeoJSON to the tmp directory
dumplines.py
Writes simplified GeoJSON layer in the tmp directory to the GeoPackage data layer
maplayer.sh
Wrapper script that simplifies a geometry layer in the GeoPackage file by creating a GeoJSON layer file, simplifying the layer using mapshaper-xl and writes the simplified layer to the output GeoPackage file layer
The current mapshaper script snaps endpoints, and rounds coordinates to one decimal place
node.sh
Installs a local nvm and nodejs environment and installs mapshaper in the node directory
simplifypoints.py
Extracts geometry layers, rounds coordinates to one decimal place for Point geometry layer or prints out the layer name
simplify.sh
The wrapper script that orchestrates the sequencing other scripts