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Where can I find GeoJSON and kml data?
I had a devil of a time finding simple GeoJSON and KML boundary files for US counties and states. Eventually I realized that I could get shapefiles from the United States Census Cartographic Boundary Files and convert them to GeoJSON and KML formats using the MyGeoData vector converter.
How are longitude and latitude coordinates used in the census?
An interpolated longitude/latitude coordinate is returned along with the address range the Census Bureau has on that stretch of road. That coordinate is then used to determine the geography that the address is within. If a Tie is encountered, there are multiple possible results for that address.
Where does the Geocoder for a census come from?
The information in the geocoder comes from our MAF/TIGER database, which holds our geographic information used for censuses and surveys. The address ranges used in the geocoder are the same address ranges that can be found in the TIGER/Line Shapefiles which are derived from the Master Address File (MAF).
How to find the geographies of a county?
Finding Geographies Using Option Column Column Name Column Description 9 State Code State FIPS Code 10 County Code County FIPS Code 11 Tract Code Census Tract Code 12 Block Code Census Block Code
Which is an example of a GeoJSON file?
GeoJSON supports the following geometry types: Geometric objects with additional properties are Feature objects. FeatureCollection objects contain sets of features. The following is an example of a valid GeoJSON file:
Can you publish a GeoJSON file to a map viewer?
Publish a hosted feature layer from a GeoJSON file. For hosted feature layers that have export enabled, you can export the layer data to a GeoJSON file. Add a GeoJSON file as a layer to Map Viewer Classic. This functionality is currently only supported in Map Viewer Classic (formerly known as Map Viewer ).
What happens when I add a GeoJSON file to ArcGIS Online?
When you add a GeoJSON file to ArcGIS Online as an item or as a layer in Map Viewer, ArcGIS Online verifies the validity of the file and displays an error message if the file is invalid.
Which is the largest GeoJSON file in the world?
The 500k files are the most detailed, but also the largest. The 20m files are the smallest, but at the cost of some dramatic simplification. The 5m files fall somewhere between the other two.
How to convert GeoJSON to TopoJSON in NodeJS?
TopoJSON is an extension to GeoJSON that encodes toplogy, resulting in much smaller files. Nodejs is required to run the script. Install topojson using npm install topojson -g. No simplification is done on these files. None of the files are combined either, although that is possible. ZCTA file fails when trying to use topojson to convert.