search

m-lab / piecewise

A customizable online survey tool for running NDT tests.
Apache License 2.0
12 stars 11 forks source link

Auto-create topojson files using OGR2OGR or other tools #117

Closed critzo closed 4 years ago

critzo commented 7 years ago

Currently we ask the deployer to bring in Shapefiles and create a topojson file. If Piecewise could automatically create a topojson file from included .shp files, all the better.

From dwins in PR #115 comments: Definitely possible to do it on the server with Postgres or OGR2OGR. Both have some caveats though - Postgres's TopoJSON support requires kind of a lot of code to use and creates an auxiliary table (http://postgis.net/docs/manual-dev/AsTopoJSON.html) Note that the demo there hard-codes the transform so you may getting worse file size compared with a more full-featured implementation. OTOH OGR2OGR is likely to use a lot of memory and might have trouble with larger datasets on smaller VMs.

BobBallance commented 4 years ago

It would be straightforward to add an 'export' option to the I3Connectivity Explorer --- they could set up the notebook with the areas that they want and then get the underlying area as a GeoJSON file. Could add support for the bounding block as well... We'd still need to look at TopoJSON, though, but I have almost all of the useful files on the server already.