Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [canopy-height-model]

The tag has no usage guidance.

4
votes
1answer
91 views

How to use lastrees on a catalog with a function requiring a CHM raster?

I'm still fairly new to using LiDAR data and R, so please let me know if this isn't clear. I am using the lidR package to segment individual trees over a large landscape. I have been using the ...
3
votes
2answers
432 views

Finding tree canopy width using PDAL?

I want to classify (and separate) houses from trees (high vegetation) in point cloud data using PDAL. I use height filter for this purpose. Our high Vegetation lies in the range between 5 and 10 ...
3
votes
2answers
2k views

Canopy Height Model of LiDAR data in QGIS?

I have a DTM and DSM files. I want to develop a Canopy Height Model (CHM) in QGIS. Is it possible?
3
votes
1answer
47 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 ...
2
votes
4answers
1k views

Identifying individual trees and segmenting crowns from LiDAR CHM data?

I have a classified LiDAR point cloud for an area of 250*250 square meter, with 1 meter resolution. It has a 5 lakhs points with an average point density of 9 (means around 9 points within a pixel). ...
2
votes
3answers
911 views

Creating a Canopy Height Model (CHM) image from a LAS file on Mac?

Main question: Is there a way of creating a Canopy Height Model from a LAS file using Mac (not wine etc)? I also would like to batch process a lot of LAS files the same way. I should mention that I ...
2
votes
2answers
98 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 ...
2
votes
1answer
39 views

How does MERIS collect vegetation height data?

In GlobCover 2005 and 2009 project, the sensor used for spectral data collection was MEdium Resolution Imaging Spectrometer (MERIS). It observes the Earth in 15 spectral bands in visible and near ...
2
votes
1answer
217 views

Height and X Y coordinates of points on Google Earth

How can I get information on height and X,Y coordinates using Google Earth data for a given terrain?
2
votes
1answer
147 views

Heat mapping forestry height trends using ArcGIS?

I am using ArcGIS and have access to Spatial and 3D Analyst extensions. I've attached a link to a picture of a 1m raster “canopy height model” which was derived from LiDAR and displays tree heights (...
2
votes
0answers
40 views

Generate an accurate DTM with photogrammetry?

I generated imagery from a low flying drone (40 M AGL) equipped with a mica sense RedEdge multi-spectral camera and have processed the imagery in PIX4D and now am attempting to do some analysis in ...
1
vote
1answer
430 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?
0
votes
1answer
404 views

Normalizing a digital surface model? [closed]

I am trying to generate a normalized DSM by subtracting the original DSM (oDSM) from the DTM. To generate the DTM I had to first use a median filter on the oDSM (remove noise) and then use a ...
0
votes
1answer
84 views

Equation in Google Earth Engine

Recently I have derived a correlation equation between biomass and canopy height using sample tree parameters from field. The equation is Biomass = 0.0001(Height)^ 2.895. I tried to ...
0
votes
1answer
402 views

Calculating forest canopy density and advanced vegetation index in ArcGIS Raster Calculator?

While performing raster calculator operation in ArcGIS for Advanced Vegetation Index ( in calculating forest canopy density), the results show only 2 values i.e high (1) and low ( 0), instead of a ...
0
votes
0answers
114 views

Finding local maxima with a variable window size in Python

I am trying to find local maxima in a DEM (canopy height model) that represents tree tops. I can do this with a fixed window size. However I would rather have a variable window size based on the ...
-2
votes
2answers
244 views

Calculating canopy height in ArcGIS Desktop without LiDAR data?

I am currently trying to assess vegetation height for my study area. I am trying to use this guide: http://desktop.arcgis.com/en/arcmap/10.3/manage-data/las-dataset/lidar-solutions-estimating-forest-...