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Questions tagged [canopy-height-model]

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Canopy cover metrices

I am trying to get canopy height metrices such as the area of a land that is covered by the trees with height up to 5 meters, with height up to 10 meters and so on, using the GEDI canopy cover data. ...
Pratyush Dhungana's user avatar
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34 views

Google Earth Engine modify resample resolution units

My initial goal is to process the global GEDI 10m resolution canopy height data for 2020. I used a loop to cut the original image into 20° x 20° tiles and used convolution kernels to average and ...
THY111's user avatar
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3 votes
1 answer
198 views

Separation of DSM as Building DSM and Canopy Height Model in QGIS

I am currently trying to separate the DSM as Building DSM and Canopy Height Model. I also have DTM, Building Footprint data. Digital Surface Model Building Footprints. For separation I converted the ...
sevvaldurmazbilek's user avatar
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0 answers
33 views

USFS Fusion software bare-ground DTM input

I downloaded 1-m 3DEP dem from USGS to use as input for Fusion bare-earth DTM (description here) and I'm using USGS lidar data for the point cloud to make a Canopy Height Model. Due to data size ...
Jonathan Burton's user avatar
1 vote
0 answers
236 views

Removing building data from LAS Dataset Layer in ArcGIS Pro to create tree canopy height layer [closed]

I'm working with various lasd files of an arboretum in order to create a layer with heights for the tree canopy. I'm trying to remove buildings from the LAS dataset so that the layer only reflects ...
Bri's user avatar
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2 votes
1 answer
61 views

LidR if-loop on coords (is/isn’t inside extent)

I'm trying to calculate metrics on a buffer around points with Lidar data. But some of my points are outside my Lidar area, thus my loop stops when it finds a point outside. I was thinking about ...
Zoe's user avatar
  • 23
2 votes
1 answer
249 views

LiDAR derived Canopy Height Differencing extent variability

I am using classified LiDAR to create a canopy height model (CHM) for two LiDAR data sets over time. When I create the CHM I use a filter, -keep_class 5 so the output raster exactly outlines the trees ...
nerdsconsider's user avatar
-1 votes
1 answer
350 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 ...
ecology's user avatar
  • 143
3 votes
1 answer
1k 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(&...
Arthur_Morgan's user avatar
2 votes
0 answers
76 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 ...
Ivan Heitmann's user avatar
3 votes
1 answer
893 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 ...
bcresearcher's user avatar
2 votes
0 answers
236 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 ...
Jonathan Berlingeri's user avatar
5 votes
1 answer
3k 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 ...
Lion Lai's user avatar
  • 258
4 votes
1 answer
691 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 ...
KLH's user avatar
  • 155
1 vote
1 answer
2k 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 ...
user123069's user avatar
1 vote
0 answers
897 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 ...
PythonStudent's user avatar
0 votes
1 answer
2k 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 ...
RK4gis's user avatar
  • 101
-2 votes
2 answers
778 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-...
Redskies421's user avatar
2 votes
1 answer
51 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 ...
Dark_Knight's user avatar
0 votes
1 answer
1k 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 ...
Prabhashini Mohapatra's user avatar
2 votes
2 answers
633 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 ...
Juan Cordoba's user avatar
1 vote
1 answer
1k 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?
Farhan Rajuli's user avatar
3 votes
2 answers
2k 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 ...
ahmad735's user avatar
  • 133
2 votes
1 answer
2k 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?
Jay's user avatar
  • 21
2 votes
1 answer
245 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 (...
GIS_Dave's user avatar
3 votes
3 answers
3k 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 ...
oskarlin's user avatar
  • 1,941
2 votes
4 answers
4k 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). ...
bibinwilson's user avatar
3 votes
2 answers
4k 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?
Arun's user avatar
  • 1,462