Local and external file loading support for geojson, image and shapefile sources

[arjxn-py]

In the direction of #246 for which this PR defines a generic method for listed data sources along with local file support.

[github-actions]

👈 Launch a Binder on branch arjxn-py/jupytergis/#246-unified-external-file-handling

[github-actions]

Docs preview: appsharing.space

[github-actions]

Integration tests report: appsharing.space

[github-actions]

Preview using JupyterLite: appsharing.space

[arjxn-py]

Hi, would you have some tip/suggestion on how and from where do i download small enough raster/hillshade/vector tile layer for local testing?

It'd be really awesome if any of those files would also be served somewhere so that it's url could also be used to cross check

I struggle to use the sources from sample jgis files as unlike for image/geojson files the other source urls are like - https://tile.waymarkedtrails.org/{variant}/{z}/{x}/{y}.png

[mfisher87]

• GADM is a great source for administrative boundaries: gadm.org
• QGreenland is a good source for data variety (interdisciplinary, raster, vector) and the layers are all available independently online. I'd download the QGIS package to explore the data: qgreenland.org | https://nsidc.org/qgreenland/layers/
• Vermont Center for Geographic information has COGs of various sizes: https://vtopendata-prd.s3-us-east-2.amazonaws.com/index.html#

[mfisher87]

https://tile.waymarkedtrails.org/{variant}/{z}/{x}/{y}.png

For tileservers you can use GDAL to download the data and build a GeoTIFF, though it's a bit fiddly: https://gis.stackexchange.com/a/417756

[arjxn-py]

Thanks a lot @mfisher87, this is helpful. I'd definitely explore these to get some data :)

[mfisher87]

Happy to help!

[arjxn-py]

For tileservers you can use GDAL to download the data and build a GeoTIFF, though it's a bit fiddly: https://gis.stackexchange.com/a/417756

If it's the geotiff only you're referring to, I think I have the required geotiff file from the sample .jgis file. Tho I've halted the logic for geotiff due to some recent changes in that logic to implement caching. I may also break this PR in parts to include that data source in a separate one.

[martinRenou]

Couple of nitpicky comments + GeoJSONSource by URL, otherwise I think it looks good!

[martinRenou]

Thanks!