Questions tagged [canopy-height-model]
The canopy-height-model tag has no usage guidance.
21
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31 views
Using leaf-off LiDAR for canopy density and canopy height
Could someone explain the drawbacks of using leaf-off LiDAR data to calculate canopy density and height? Is it acceptable to use this at all?
I have read a few papers but I find it hard to make ...
2
votes
1answer
422 views
Tree Segmentation using lidR
In rLiDAR, you can segment trees by using CHMs ASCIIs produced by Fusion. Can the same be done in lidR? I know in lidR you have to use the .laz file for tree segmentation:
LASfile <- system.file(&...
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0answers
55 views
Multiple centroids of complex outline polygons by recursive buffering
How can I algorithmically determine multiple centroids for overlapping (dissolved), very irregular regions representing canopy outlines?
This is effectively a forestry issue. The context is that I ...
3
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1answer
307 views
How to deal with minus values on canopy height model?
I created a canopy height model (from lidar data) using lidR package and wanted to check it on Arcmap. I see there are minus values on canopy height models like -0.246219, -0.0302621. How can I deal ...
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0answers
131 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 ...
4
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1answer
1k 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 ...
4
votes
1answer
447 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 ...
1
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1answer
879 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 ...
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469 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 ...
0
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1answer
1k 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 ...
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2answers
543 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-...
2
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1answer
46 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 ...
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1answer
806 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 ...
2
votes
2answers
295 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 ...
1
vote
1answer
851 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?
3
votes
2answers
1k 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 ...
2
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1answer
750 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
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1answer
216 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
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3answers
2k 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
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4answers
2k 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).
...
3
votes
2answers
3k 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?
