Sandbox

For experimenting with cave survey data

Fake survex data

This has a spiral so that the passage crosses over itself. It is georeferenced so that the entrance is located under the track down to Bull Pot Farm (BPF) ... ha ha!

Also provided is a cropped digital elevation model (DEM) and a georeferenced cropped aerial image to match. The DEM is taken from the OS Terrain 50 data set, (c) Crown Copyright and database rights 2019.

Files

• bpf_fake_cave.svx : survex file for fake cave survey data

• bpf_fake_cave.3d : processed cave survey data

• bpf_fake_cave.gpkg : cave survey data exported to GeoPackage format (*)

• bpf_aerial_clipped.tif : aerial image of BPF as GeoTIFF

• bpf_dem_clipped.tif : DEM as GeoTIFF

• bpf_fake_cave.qgz : QGIS3 project file containing the above

(*) using the .3d to QGIS3 import filter described elsewhere ...

Here's a screenshot of the last of these: QGIS3 with the fake cave on top of the aerial image.