All Questions
41
questions
-1
votes
1
answer
36
views
Python CLI/Package to handle DTM conversion from raster to mesh (obj or ply) [closed]
I was wondering if there is a Python CLI, package or even a QGIS tool that makes it possible to convert a DEM from raster to mesh. The only way I found at the moment is sampling points from the raster,...
- 15
2
votes
0
answers
26
views
Conversion of a DEM model from Baltic Height system 1977 to EGM96
I have a raster DEM model (geotiff) with horizontal coordinate system EPSG:4326 and vertical heights regarding the Baltic Heigts system 1977 https://epsg.io/5705
I'm trying to convert it into EGM96 ...
- 21
0
votes
0
answers
132
views
How to convert 2D surface area into 3D surface area using DEM
I have a polygon layer of the area burned by wildfire, which lies in the very hilly terrain. The polygon of the burned area was drawn manually over the ortophoto, which means, that the polygon has ...
1
vote
1
answer
1k
views
Converting .obj (3D files) to .tiff raster
I have a 3D .OBJ file that i need to convert to raster (geotiff) so that i can use it in QGIS/python gdal.
I have found several answers online about how to convert a DEM or TIFF to .obj, but not the ...
- 185
0
votes
1
answer
954
views
QGIS Raster Convert Negative Values to NULL
I have a DEM layer in QGIS and want to replace all cells with negative values to the value "NULL". How can I achieve this please?
- 49
2
votes
2
answers
3k
views
Convert TIF file to CSV/ASCII format using QGIS v. 3.24.1-Tisler
I have DTM data in the format of .tif and I need to export this as CSV or ASC for point cloud data input into Leapfrog.
I've read other walk-thrus that are outdated now (2014/2017) that came close to ...
- 21
2
votes
1
answer
113
views
Merge a .gpx with a DEM
I have two files, a DEM and a .GPX. How can I mix the two files so that the .gpx is part of the DEM (in black and white), but rendering the color at an elevation 10m higher than the DEM?
The color of ...
- 97
2
votes
1
answer
552
views
In QGIS change DEM elevations values from positive to negative
I have a DEM that currently has positive elevation values for bathymetry and negative values for those above sea level. How can I convert these cell values to negative for bathymetry and positive for ...
- 49
2
votes
1
answer
667
views
Converting DEM raster (NetCDF file) into point cloud (LAS file) using Python
I would like to convert a DEM raster NetCDF file (*.nc) to point cloud LAS file (LAS/LAZ) using Python language. I have been doing the research but still don't have a result. I also have a look on ...
- 67
1
vote
0
answers
551
views
Easy way in PyQGIS to convert a distance from meters to coordinates?
I am attempting to clip DEM rasters (USGS, in WGS 84) into a set of tiles measuring 2.56km on a side, in QGIS, using python.
So far, it appears that gdal_translate is working for me, using a ...
- 23
0
votes
1
answer
60
views
Converting IMG to BIL/HRD/BLW?
I'm trying to convert IMG data from USGS's 1/9 arc second DEM to something that Pathloss 5 can read.
Is there a way to do so?
2
votes
0
answers
548
views
Does changing raster image type from .img to .tif change quality? [closed]
I have a DEM raster image in .img format. I am thinking about converting it (through Export Data in ArcMap) to the .tif format.
Will that change the quality or any pixel values?
- 258
3
votes
1
answer
221
views
Convert DEM elevation points from centimeters to meters
I would like to convert a large DEM stored in PostGIS which contains elevation values in centimeters to elevation in meters.
I found an easy way by updating each point like this:
UPDATE mydem a
SET ...
- 200
3
votes
0
answers
179
views
Converting Mars Global DTM to Spherical Mesh
I am working on a video game that is attempting to provide a semi-realistic model of Mars. My starting point has been to find and use reliable geographic information to create the "model" of Mars.
I ...
- 31
1
vote
0
answers
624
views
How to convert raster DEM to reduce file size in QGIS? e.g. 32 to 8 bit floating point
I have a raster DTM (.tif, 32 bit floating point) which has a very large file size and is thus slowing down the software. I am looking for a way of reducing the file size without reducing grid cell ...
- 97