Linked Questions
19 questions linked to/from Differences between DEM, DSM and DTM?
12
votes
4
answers
6k
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Comparing two Digital Elevation Models (DEMs) from LAS files?
I have two LiDAR files (.las), one is original let's say with X points. And the other is copy of the first .las file but with Y points, where Y is less than X.
Now, I want to compare the Digital ...
jkl
12
votes
4
answers
6k
views
Filtering out canopies and buildings from DSM to have a bare earth elevation
Can anyone suggest methods in filtering out trees and buildings from a DSM so as to come up with a reliable DEM?
What I have is a grid from a LIDAR data (.tif file, with 1m resolution). I was going ...
- 459
9
votes
2
answers
1k
views
Retrieving heights of buildings using remotely sensed data (except lidar)
How can I get the height values of buildings from a certain sector a city without going into the field to collect data? Is there anyway to do via satellite imagery, SRTM, ASTER GDEM or any DEM for ...
- 793
7
votes
5
answers
20k
views
Converting LiDAR data to raster (DEM/DSM) for ArcGIS input?
I was wondering if there is an option to convert LiDAR data (.las) to a raster/grid (DEM/DSM) format that ArcGIS 10.0 can read?
- 79
7
votes
2
answers
373
views
Improve DTM under forested areas without smoothing?
I'm using a DTM retrieved from LiDAR data and I noticed that forested areas are grainy or not defined. The DTM data was retrieved from geostore.com. Here is one example:
Is there any way to directly ...
- 663
6
votes
3
answers
1k
views
Is there a DTM available for free somewhere?
To go a little bit further than the semantic question regarding DEM/DTM/DSM, I'd like to know if there is a free (of charges and use) DTM datasets? And what about resolution?
As far as I know,only ...
- 8,482
6
votes
1
answer
1k
views
Calculating shadow of trees with DEM in QGIS?
I have a DEM with a good precision (0,5 x 0,5 m/pix LiDAR) and I´m looking for the way to obtain a raster (or shapefile) with the shadow of the trees located in that place for a whole day (ideally ...
- 193
4
votes
1
answer
3k
views
DTM extraction of tree heights
I need to classify tree heights in a DSM of a slope-y terrain. It´s not a forest but several individual / detached trees. In a plane terrain it won´t be an issue but in that uneven terrain I need ...
- 89
2
votes
2
answers
420
views
Pixelated DSM using LAS Dataset to Raster?
I am using ArcGIS 10.2.2, and I am trying to create a DSM out of some LIDAR data. After checking the LAS Dataset properties, I see that I have an average point spacing of approx 0.3.
I tried ...
2
votes
2
answers
344
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 ...
- 193
2
votes
2
answers
6k
views
Interpreting .ASC/LiDAR Data?
I'm a complete novice to the world of GIS. I'm involved with a project which requires LIDAR data to be imported into CAD software.
When I go to the geostore, which contains LIDAR survey data ...
- 29
2
votes
1
answer
2k
views
Why ground model from point cloud in Global Mapper is inaccurate?
I have a LAS file that I assumed was based on LiDAR, but it is actually based on ADS (airborne digital sensor) imagery, according to the body that captured the data.
I load the file in to Global ...
- 21
1
vote
1
answer
13k
views
Creating Digital Terrain Model from Digital Elevation Model using ArcGIS for Desktop? [closed]
I have a DEM and I want to create a DTM from that DEM. Is it possible to do this in ArcGIS?
- 11
1
vote
1
answer
921
views
Generating Canopy Height Model (CHM) with Quick Terrain Modeler?
I currently looking forward to process LiDAR point clouds (forest data) using Quick Terrain Modeler (QTM), but is it possible to create Canopy Height Model directly using the software?
1
vote
1
answer
71
views
Checking Vegetation height accuracy in urban areas
I have digitized vegetation as polygons covering the canopy of trees in urban areas. Are there any suggestions to check the accuracy of height. I have been manually validating with visual checks, ...
- 13