I have 2m grid LIDAR DTM data with decimal elevations in a .asc file which I wish to import into Sketchup.
I have managed to achieve this using the workflow here:
This mostly works. The Geolocation is lost, but can be replaced.
However all the elevations come in as integer meters. LIDAR is more accurate than that and I would like to make use of the accuracy.
One approach I have looked at is translating from the LIDAR .asc dtm file to the international SDTS .ddf format which supports decimal elevations and can be imported by Sketchup. But I am unable to find a tool to do the translation.
(In the UK, not sure about US, DTM stands for digital terrain model, a cleaned up DSM or digital surface model eg DSMs show house roofs, DTMs don’t)
First few lines of LIDAR DTM .asc file below. The rest of the file continues with more point elevation values and a newline every so often. There is no terminating string. Values are in meters. Geolocation ‘x||corner, y||coner’ is an UK Ordnance Survey grid reference for a corner of the area covered. Cellsize=2 gives the 2m spacing of values.
153.555 153.460 153.365 153.353 153.199 152.997 152.893 152.842 152.738 152.622 152.518 152.408 152.307 152.230 152.133 151.952 151.583 151.316 151.180 151.109 151.223 151.367 151.497 151.613 151.702 151.842 151.976 152.018