Notes on how I create the annexation visualizations for San Jose and Mountain View.
- requires 1.x version of Topojson (
npm install -g topojson@1)
- requires ogr2ogr (
brew install gdal)
Create separate shapefiles for each year range (1945-1950, 1950-1955, etc.). This work is done in QGIS by selecting the features by a range of years and saving as a new shapefile.
Next, convert each shapefile into a topojson file.
ogr2ogr \ -f GeoJSON \ -t_srs EPSG:4328 \ YEAR.json \ SHAPE.shp
- Once each year range shapefile has been converted into a GeoJSON file, we merge them into a single topojson file.
topojson \ -o mountainview.json \ -- \ YEAR1.json \ YEAR2.json