Linked Questions

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votes
1answer
1k views

How to generate DTM from point cloud data? [duplicate]

I have point cloud data obtained from drone. I need to generate DTM out of it. How can I generate and I checked options in ArcGIS and QGIS. I was not able to find any.Could anyone suggest a method to ...
1
vote
1answer
194 views

GrassGIS process for DTM of UAV point cloud [duplicate]

Using grassGIS I am attempting to produce a DTM (remove buildings and vegetation) from the las point cloud. Unfortunately the point cloud exported from dronedeploy.com does not distinguish first and ...
-1
votes
1answer
72 views

Can my “.las” data be classified [duplicate]

I was given a ".las" data set from a Trimble/AutoCAD shop. I use Esri. I could not import the .las file they supplied to an ESRI LASDataset as it was created with Trimble software. I downloaded and ...
7
votes
5answers
15k 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?
10
votes
8answers
4k views

Editing LiDAR point cloud to remove noise/outliers present below and above ground?

I have "dirty" LiDAR data containing first and last returns and also inevitably errors under and over the surface level. (screenshot) I have SAGA, QGIS, ESRI and FME at hand, but no real method. What ...
6
votes
4answers
10k views

Creating DEM from LAS file without using LAStools?

I want to create a ground model from a *.las file. The LAStools are available in QGIS but limited in use (generation of black diagonal in result file), so I can't use this. In the GRASS tools I can ...
9
votes
3answers
4k 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 ...
6
votes
3answers
2k views

Finding outliers with wrong Z values in LIDAR data

I have more than 2000 XYZ (only ground points) .txt files and I have to do Quality Control (QC). Let's say I have file, which I converted to multipoint (or even singlepart feature). I have mean Z ...
8
votes
3answers
4k views

Normalizing point cloud data

How I can get Digital Height Model (only object heights, DSM - DTM = DHM)? Many applications can do this, but they convert it to GRID or TIN format. I was wondering if it was possible to keep the ...
3
votes
3answers
1k views

Removing las2dem streaks from raster DEM?

I've created a series of DEM files using the las2dem tool from LAStools; however since I don't have a licensed version they have black streaks running across them. Does anyone know a good method for ...
5
votes
2answers
2k views

Retrieving average building height in urban areas?

I am looking for a way to collect data on the height profile of some cities over time. I don't need to produce a detailed 3D reconstruction of cities, nor do I need to detect and measure individual ...
6
votes
1answer
2k views

Breakline detection algorithms for LiDAR dataset?

I'm searching for algorithms or open source tools I could use to detect breaklines from a LiDAR dataset; more specifically, from the terrain points of the dataset. At the moment the only thing I've ...
4
votes
1answer
818 views

DEM out of a shaded relief LiDAR?

I have a DEM built from LiDAR data and the file extension is .tif. When I open this file in ArcMap it seems to be a shaded relief DEM (see the screenshot below). It happens I want to visualize the ...
4
votes
2answers
974 views

Classifying raw LAS data as bare earth in ArcGIS for Desktop?

I have a raw LAS data that has only one return (no second/ third.. return) and not classified yet. The only information I have is intensity and elevation. Is there any way that I can classify bare ...
3
votes
2answers
964 views

Manually editing a LiDAR cloud to remove non ground points

I've recently been tasked with cleaning up a LiDAR file of a river where I need to remove trees, shrubs and power lines that run right across the river. I was looking into LAStools but it has a limit ...

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