| Thu Nov 16 03:14:25 2017 by Alex Muro |
| How difficult would it be to modify this planet generator to export geojson (http://geojson.org) files that held say polygons of different levels of elevation. Has anyone tried anything similar? I'm thinking about giving it a shot and pointers would be appreciated. |
| Thu Nov 16 11:08:19 2017 by Torben |
| The planet generator generates altitudes for individual points, so it would not be difficult to generate GeoJSON points. The files would be huge, though. Generating polygons is possible, but a bit more difficult. The planet generator works by subdivision of irregular tetrahedra, so if you stop subdivision before you reach pixel-level detail, you can project the corners of the tetrahedron onto the spherical surface to get longitude/latitude for each point. The four projected vertices would then form a polygon. The corners of these polygons would be at different elevations and would form something akin to a triangulation of the surface. If you want polygons of same altitude, it is probably easiest to generate a bitmap with contour lines and trace these to generate polygons. |
| Thu Nov 16 14:24:08 2017 by Alex Muro |
| How difficult would it be to modify this planet generator to export geojson (http://geojson.org) files that held say polygons of different levels of elevation. Has anyone tried anything similar? I'm thinking about giving it a shot and pointers would be appreciated. |
| Thu Nov 16 14:27:29 2017 by Alex Muro |
| Hey Torben, Thanks for the response. Yeah I was hoping for polygons of elevation contours. I have had some luck generating them from black and white contour files generated from images using qgis but that takes a v long time. I'm planning on taking a closer look at the code today to see if I can use the countours to create polygons. Cheers, Alex |