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Questions tagged [catalog]

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2 votes
2 answers

Creating Catalog Subset using lidR

I have a catalog of just over 3000 LAZ files that I want to split into regions using clip_rectangle(). The total catalog size is 60GB. My PC has 64GB of RAM but I get an error that lidR is unable to ...
0 votes
0 answers

Output of catalog_map in R

i am quite new to R and RStudio, i am currently working with a large set of point cloud data (~450 files), when I try to get the crowns attributes with catalog_map(), I find that the output of the ...
2 votes
1 answer

Creating Crown Maps from Catalog using lidR

I have a large catalog and I'd like to create crown maps for the entire catalog or a portion of the catalog. I've been successful at creating crown maps from single LAZ files by editing/running the ...
5 votes
1 answer

Unusual polygon shapes when using tree_hulls?

The following script uses lidR to segment trees and output tree hulls (i.e. polygons representing individual tree canopies). Input data are a directory of laz files and a catalog is used to manage the ...
2 votes
1 answer

Remove buffer in catalog_apply()?

I am using catalog_apply() to normalize las points using lasnormalize() and segment individual trees using lastrees(). This is modified from the catalog_apply() lidR documentation (p.10): library(...
2 votes
1 answer

Find optimal chunk size using opt_chunk_size() in lidR catalog?

Is there a way to find the optimal chunk size using opt_chunk_size() when using a lidR catalog? I seem to always randomly choose integer values until the program quits throwing errors at me. For ...