All Questions
Tagged with photogrammetry dem
15 questions
0
votes
0
answers
51
views
Generating orthomosaic from DEM in Metashape
I'm using Metashape to make a point cloud from georeferenced drone images using the basic workflow (Align photos -> Build Point Cloud). I then export that and align it to a LiDAR cloud we have from ...
- 45
1
vote
1
answer
103
views
Options for making a DEM of single-return point cloud?
I have a project site surveyed with single return photogrammetry so, all points are unclassified. It was not a problem to create a DSM of this data, but I also need a DTM.
What are my options? Will I ...
- 717
2
votes
1
answer
65
views
DEM from overlap monocular images Pleiades
I am trying to create a DEM from 4 overlap monocular satellite images of different dates from Pleiades using UP42.com. But I could find only information about stereo images processing.
Is it even ...
1
vote
0
answers
451
views
DSM results from WebODM are not correct [closed]
I am new to WebODM and I am trying to generate DSM and Orthomosaic images using default settings in WebODM.
The Orthomosaic image is correct by providing GCP but the DSM file is having inaccurate ...
5
votes
1
answer
3k
views
CHM (Canopy height model) = DSM (Digital surface model) - DTM (Digital terrain model)
I want to create a canopy height model (CHM) which has the height of objects (trees, building, etc.) from DSM and DTM. Below is the step by step procedures which I did so far.
I use open source s2p ...
- 258
1
vote
1
answer
141
views
Generating DEM Generation in LPS?
I have a Cartosat 2.5 m Imagery and Block files along with DSM Data. I wanted to generate DEM using Leica Photogrammetry Suite Software. Does anyone know the steps of generating same?
I have to edit ...
- 21
5
votes
1
answer
643
views
DSM quality lower in ArcGIS Pro than PhotoScan
I am processing aerial photos collected with an automated drone flight into orthomosaics and DSMs, and have noticed the quality of outputs produced in PhotoScan is much higher than those produced in ...
- 3,112
2
votes
2
answers
661
views
Getting a flat surface from DSM for height calculation?
I have a DSM done trough photogrammetry with the software Agisoft Photoscan of a forestry experiment and I need to accomplish an analysis of the mean height from it. My problem is that the profile has ...
- 203
4
votes
0
answers
200
views
Counting treetops from the DSM [duplicate]
I want to measure tree heights in the forest using drone photogrammetry. So far it's easy to measure single trees height using fugroviewer in the pointcloud, but I would really like to measure whole ...
4
votes
1
answer
2k
views
gdal_merge.py with memory constraints
I export bunch of DEM files (10000x5000) from Photoscan and I need to combine them with gdal_merge.py but the problem is that it consumes all the memory availible and can't finish processing.
What ...
- 621
2
votes
1
answer
908
views
Georeferencing an oblique angle photograph in repeat-photograph studies
Backround: Aerial photography and remote sensing can be used to measure current land cover and recent land use change. However, these technologies are fairly recent and therefore time series are ...
- 1,851
4
votes
2
answers
7k
views
Using Phantom 3 Pro to capture aerial imagery for small site plans and derive DEM? [closed]
I am curious if this consumer UAV can be used to capture imagery for further processing to stitch seamless imagery and to use as input into stereo/photogrametry software to create reasonably accurate ...
- 20.4k
2
votes
1
answer
1k
views
Automatically adding Z-values from a DEM to an already created polygon
We have excavated a very large 5.000 year old fish fence, which was documented by photogrammetry, and is now being digitized. I started digitizing the orthophoto in QGIS and everything is cool. Now I'...
- 53
3
votes
1
answer
1k
views
Create DEM from cartosat stereo pairs?
I have two carstosat stereo pair images. All i need to do is to extract DEM from those.
So, i tried it doing with OSGeo4W. but i didn't succeeded in it.
So IS there any other softwares or opensource ...
- 41
6
votes
6
answers
2k
views
DEM generation from ASTER L1B imagery using FOSS
Is there any (photogrammetric or other) FOSS package to support the generation of a DEM from ASTER L1B products (i.e. combining the spectral bands 3N and 3B)? Are there any practical examples or/and ...
- 1,350