us-counties-datasette
timezones-api
| us-counties-datasette | timezones-api | |
|---|---|---|
| 1 | 2 | |
| 9 | 27 | |
| - | - | |
| 0.0 | 0.0 | |
| over 1 year ago | over 1 year ago | |
| Shell | Python | |
| - | - |
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us-counties-datasette
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SpatiaLite: A Spatial Extension to SQLite
It had been quite a while since a major release, but then SpatiaLite 5.0 came out a couple of months ago with some very significant new features - the K-Nearest-Neighbor stuff is particularly interesting. https://www.gaia-gis.it/fossil/libspatialite/wiki?name=5.0.0...
I've built a few fun demos using SpatiaLite and Datasette. Here's an API that tells you the timezone for a latitude longitude point:
https://timezones-api.datasette.io/timezones/by_point?longit... - implementation here: https://github.com/simonw/timezones-api
And here's the same thing for which US county a point is within: https://us-counties.datasette.io/counties/county_for_latitud... - implementation here: https://github.com/simonw/us-counties-datasette
I've also built an experimental Datasette plugin that lets you draw a shape on a Leaflet map to generate a GeoJSON polygon, then uses SpatiaLite to show you geometries that are contained by that drawn polygon. I wrote about that here: https://simonwillison.net/2021/Jan/24/drawing-shapes-spatial...
timezones-api
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SpatiaLite: Library extending SQLite to support Spatial SQL capabilities
I wrote a tutorial on SpatiaLite here: https://datasette.io/tutorials/spatialite - "Building a location to time zone API with SpatiaLite"
It shows how to use SpatiaLite + Datasette to build an API that can tell you what timezone a latitude/longitude point is in, using data derived from OpenStreetMap via https://github.com/evansiroky/timezone-boundary-builder
Here's a demo: https://timezones.datasette.io/timezones/by_point?longitude=... - add ".json" to the URL for the JSON output.
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SpatiaLite: A Spatial Extension to SQLite
It had been quite a while since a major release, but then SpatiaLite 5.0 came out a couple of months ago with some very significant new features - the K-Nearest-Neighbor stuff is particularly interesting. https://www.gaia-gis.it/fossil/libspatialite/wiki?name=5.0.0...
I've built a few fun demos using SpatiaLite and Datasette. Here's an API that tells you the timezone for a latitude longitude point:
https://timezones-api.datasette.io/timezones/by_point?longit... - implementation here: https://github.com/simonw/timezones-api
And here's the same thing for which US county a point is within: https://us-counties.datasette.io/counties/county_for_latitud... - implementation here: https://github.com/simonw/us-counties-datasette
I've also built an experimental Datasette plugin that lets you draw a shape on a Leaflet map to generate a GeoJSON polygon, then uses SpatiaLite to show you geometries that are contained by that drawn polygon. I wrote about that here: https://simonwillison.net/2021/Jan/24/drawing-shapes-spatial...
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