All Questions
Tagged with dem coordinate-system
57
questions
1
vote
1
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244
views
Reprojecting raster in QGIS moves all values to completely different range
This question has been asked here multiple times. And every time, it seems that the people offering answers don't understand the magnitude of what's happening. When I reproject a DEM raster with this ...
- 157
2
votes
1
answer
99
views
Using Esri ASCII Grid as DEM + Reprojecting
I've downloaded *.txt files from this site: https://ide.cat/geonetwork/srv/eng/catalog.search#/metadata/model-digital-terreny-5x5-v1r0
I used Copy Raster tool to import one of the files with Esri Grid ...
- 291
0
votes
0
answers
69
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GeoTIFF for DEM has right coordinates but the actual dimensions are very smaller
The GeoTIFF file I have for Digital Elevation Model (DEM) has the following span:
N: 51 deg E: -110 deg
S: 50 deg W: -112 deg
The actual length and width of the area should be (89.1 miles x 69....
1
vote
1
answer
97
views
Raster DEM projection rendering problem
I am new to QGIS and am using it primarily for the DEMto3D plugin. My use case is creating STL meshes so I can CNC carve scale models of the landscape features as art pieces.
I purchased one meter ...
- 119
5
votes
0
answers
102
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How do I find the correct projection of a DEM to be used for viewshed analysis?
My data download from Earthdata.nasa.gov for a DEM is in WGS84 CRS. I am aiming to create Viewshed using QGIS 3.14 but I am getting the below error message:
Raster pixels are irregular in shape (...
- 126
1
vote
1
answer
57
views
Elevation dataset appears to have come with all of the Eastings wrong
I'm working with QGIS 3.12, trying to create a basemap of a mine site in Alberta for an env sci related project. I downloaded the 20k ASCII DEM from Altalis and imported the .gnp layer; which is a ...
- 13
1
vote
0
answers
980
views
Export different resolution of raster from QGIS
I'm currently sitting on a project where I have a DEM of an area that has been scanned. it currently has around 3-ish pixel per meter on export but I need to export it as 1 pixel per meter and also ...
- 11
0
votes
0
answers
21
views
Point value Change after projection - USGS DEM Raster VS Imagery Layer from Esri
I'm working on a project that requires National level DEM data, and Esri are providing the imagery layer
(https://www.arcgis.com/home/item.html?id=0383ba18906149e3bd2a0975a0afdb8e).
For the most part,...
0
votes
0
answers
30
views
How can I change the pixel-size from degrees to meters? [duplicate]
I have a Martian DEM whose pixel size is specified in degrees instead of meters. I was trying to convert in Global Mapper but it didn't work. Now I am trying convert in QGIS with projections but it ...
- 11
1
vote
1
answer
598
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Pixel size convert from degrees to meters of Martian DEM
I have a Martian DEM whose pixel size is specified in degrees instead of meters. I was trying to convert in Global Mapper but it didn't work. Now I am trying convert in QGIS with projections but it ...
- 11
2
votes
0
answers
730
views
Vertical datum transformation in ArcGIS Pro
I'd like to compare USGS 3DEP DEM with SRTM DEM for western U.S.. I did some research here, and find out that I need to match their datum (from NAD83-NAVD 88 to WGS84-EGM 96) before comparing the ...
- 21
0
votes
0
answers
76
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DEM coordinates do not align other data layers
I recently downloaded Original Product Resolution (OPR) Digital Elevation Model (DEM) data for some analysis. The DEM does not align with any of the other data sets I have for the area.
I have ...
- 109
1
vote
2
answers
539
views
Is it considered best practice to project a raster before computing zonal statistics?
I have DEM data that is in a GCS (NAD 1983 (CSRS)) with vertical units in meters. My understanding is that before doing any processing on a raster, the horizontal and vertical units should be made to ...
- 135
2
votes
1
answer
2k
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Raster is in the wrong place, upon warping it dissappears in QGIS [duplicate]
I assigned a Raster image to its designated projection, it reappears 500 miles away. I tried to assign different projections, it goes off to another random place. I reproject it a variety of CRS's, ...
- 23
2
votes
0
answers
228
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Lunar Reconnaissance Orbiter (LRO) stereographic projection transformation equations issues
I have been trying to figure out the coordinate frames the Lunar Orbiter Laser Altimeter (LOLA) team uses for data.
In their dsmap_polar.cat file they state:
where λ is the longitude and X and Y are ...
- 129