A project to study what dual graphs know about census geographies.
To use any of this project's code, you will need some dual graphs! The import_graph function expects dual graphs to be in the correct folder for the given geography level and named in the format {geography level prefix}_{lowercase two letter state abbrev}.json. The geography level prefixes appear in the following table:
| Geography Level | Prefix |
|---|---|
| "block" | "b" |
| "blockgroup" | "bg" |
| "tract" | "t" |
| "county" | "cnty" |
| "vtd" | "vtd" |
So, for example, the dual graph for New York counties should be data/county_graphs/cnty_ny.json.
If you want to use the generate_shp utility function, you will need the shapefiles you're using in data/ as well. These follow a similar idea, but use the census filenaming scheme. If you download 2020 shapefiles from the census API, they will be named correctly, but I will document the filename prefixes here for completeness. All the shapefiles start with tl_2020_{state fips}_ and end with a geography level abbreviation from the following table.
| Geography Level | Filename Format |
|---|---|
| "block" | "tabblock20" |
| "blockgroup" | "bg" |
| "tract" | "tract" |
| "county" | "county20" |
| "vtd" | "vtd20" |
This method checks for either a zipped shapefile (filename.zip) or an unzipped shapefile (a directory filename with contents named the same as the directory with extensions .cpg, .dbf, .prj, .shp, .shp.ea.iso.xml, .shp.iso.xml and .shx). So for example, the shapefile for New York (FIPS 36) counties would either be data/county_shapefiles/tl_2020_36_county20.zip or data/county_shapefiles/tl_2020_36_county20/ containing:
data/county_shapefiles/tl_2020_36_county20/tl_2020_36_county20.cpg
data/county_shapefiles/tl_2020_36_county20/tl_2020_36_county20.dbf
data/county_shapefiles/tl_2020_36_county20/tl_2020_36_county20.prj
data/county_shapefiles/tl_2020_36_county20/tl_2020_36_county20.shp
data/county_shapefiles/tl_2020_36_county20/tl_2020_36_county20.shp.ea.iso.xml
data/county_shapefiles/tl_2020_36_county20/tl_2020_36_county20.shp.iso.xml
data/county_shapefiles/tl_2020_36_county20/tl_2020_36_county20.shx