LIDAR (Light Detection And Ranging) is an active optical remote sensing technology that measures properties of scattered light to find range and/or other information of a distant target.
13
votes
6answers
3k views
Methodology for creating accurate drainage networks (and catchments) from high resolution LiDAR DEM?
This is not the first time I've stumbled over this issue; it seems that I am unable to generate a correct drainage network model and the resulting catchments from full resolution (1m cells) LiDAR ...
6
votes
3answers
313 views
Grass v.rast.stats returning null values
I have a vector layer (polygon) and a raster layer. The raster layer holds values for height above bald earth in a field called "value". I'd like the vector layer to inherit either the mean or the ...
4
votes
2answers
731 views
How to build 3D building models from lidar data?
Aloha to all and thanks for helping me.
I have Lidar data, ground points and first returns. I have processed it and have ready tiles from which I am trying to build 3D building models.
So far I was ...
4
votes
2answers
407 views
comparing two TINs
i have the following two files:
1) LiDAR las file1
2) Let's give it a name LiDAR las file2, contains the same file1 data, where number of points randomly removed.
So if file1 contains X number of ...
2
votes
2answers
238 views
Where I can find real world data for triangulation?
I want points for practicing triangulation algorithms.
Just points with coordinates [X,Y] and elevation [Z] of real world terrain.
I can use Google Maps Elevation API, but there is no method how to ...
9
votes
4answers
887 views
comparing two DEMs
i have two Lidar las files, 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 wanted to compare how the Digital ...
2
votes
2answers
2k views
Converting xyz batch to ESRI grid format using XYZ2GRID 2.1 - batch problems
I am trying to use Min-Lang Huang's XYZ2GRID2.1-Batch program downloaded from ArcScripts and I keep getting the error
C:\users\public...........xyz Error-Object required
Does anyone know what the ...
14
votes
13answers
15k views
How to a convert LiDAR XYZ files to DEM / DSM?
Normally consultants (LiDAR survey) provide me with data to my specifications; already in ESRI GRID or ASCII GRID format. This way LiDAR data can be easily used with ArcGIS.
This time I only have xyz ...
8
votes
2answers
899 views
How do I combine high resolution and generalized hillshade rasters to produce enhanced shaded relief?
I often add LiDAR data to a map along with a shaded relief. Most of the time i have to generalize the LiDAR dem depending on the scale of the map. Still, there is often too much detail and mountain ...
9
votes
7answers
601 views
What is the best way to visualize multiple large LIDAR tiles?
I want to load approximately 10 large LIDAR tiles for analysis. I have tried using ArcScene but it appears there is a limit on how much data ArcScene can handle at one time. Each tile is 65-90MB in ...
2
votes
4answers
839 views
What are Limits on ArcScene and LiDAR?
I am trying to load anywhere from 5 to 10 LIDAR TINS into ArcScene. I am using ArcGIS Desktop Evaluation (student) 9.3.1. I just built a new computer with a AMD Phenom II X6 1090T six core processor, ...
