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?

  • Can CHM be performed from RGB generated Ortho and DSM in QGIS ?
    – David
    Dec 5, 2019 at 11:18

1 Answer 1


To obtain a Canopy Height Model (CHM), subtract the DEM from a DSM using the Subtract Model tool:

enter image description here

Take a look at Quick Terrain Modeler: Importing LAS to DEM/DSM tutorial. The part you are interested begins in 4:58, but I advise watching the full video (the above picture was taken from it).

I also find the Quick Terrain Modeler: Above Ground Analysis tutorial useful, because it teaches to build a Digital Elevation Models from both unclassified and classified point clouds, and then, to normalize points using the created DEM. The 'DSM' resulting from a normalized point cloud is the CHM.

In case one is confused about the DEM or DSM terminology, I suggest reading What is the difference between DEM, DSM and DTM?

About if "QTM can be an autonomous processing software for biomass estimation of the forest":

Usually, when working with LiDAR data aiming to estimate forest biomass (both through an area-based approach or a single-tree approach) there will be more than one software involved. Hence, QTM won't work for performing all necessary steps (for example, tree segmentation). For the latter, take a look at:

Extracting tree crown areas from remote sensing data (visual images and LiDAR)

What I usually do when modelling forest biomass is to use a statistic software such as R, and call other tools for processing LiDAR data from there. For example, see Retrieving LiDAR metrics from relative vertical layers of point cloud.

  • Can this software perform single tree segmentation ? Dec 3, 2017 at 16:25
  • as far as i know, the software is limited to certain extend only and for further analysis, we have to proceed to other GIS software; ArcGIS for example Dec 7, 2017 at 3:27
  • @FarhanRajuli, I complimented my answer to explain what I do in terms of software used when modelling forest biomass with LiDAR data. Best. Jan 2, 2018 at 21:08

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.