Questions tagged [grid-metrics]
GridMetrics computes a series of descriptive statistics for a LIDAR data set. Output is a raster (grid) represented in database form with each record corresponding to a single grid cell. GridMetrics is a component of FUSION/LDV software for LIDAR Data Analysis and Visualization.
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32 views
Creating a Grid on a map in QGIS [closed]
I have a project which requires, as an initial step, to select a specific area of a map and add a grid on top of it, so that there will be cells dividing the map into 1m x 1m squares.
My question is, ...
1
vote
1answer
58 views
Eliminating outliers from a normalized LAS file and output as another LAS file
I need to normalize, eliminate outliers and calculate metrics for a big number of .LAS data of a large area by using as much possible the package LidR. The problem comes when I try to run this part of ...
2
votes
1answer
41 views
Keeping name of metrics as band names when using grid_metrics (lidR)
When executing grid_metrics for a normalized LAScatalog the final results are GTiff files where each band corresponds to a metric. The problem is that the band names are "band 01", "band 02", "band 03"...
3
votes
2answers
131 views
Calculation of density metric of 0.75 height quantile based on Airborne LiDAR Scanning point cloud data by lidR package [closed]
This is a piece of code that I wrote:
metrics<-function(z){Q75=quantile(z,probs=c(0.75))
aboveq75=sum(z>Q75)
dh75=aboveq75/length(z)
return(dh75)}
DH75<-grid_metrics(lid,~...
2
votes
1answer
79 views
GridMetrics output does not align with base DTM?
I am trying to derive grid metrics from LiDAR (.las) file using FUSION's GridMetrics tool.
My problem is that the output raster from GridMetrics does not align with the base DTM used to run the tool.
...
4
votes
1answer
394 views
Calculating standard metrics in multiple LiDAR files with lidR 2.0
I am porting my existing code to lidR version 2.0 and would like someone to let me know if I am coding efficiently. My objective is:
to process a directory of LAS files
normalize las files
calculate ...
2
votes
1answer
121 views
How to incorporate stdmetrics in gridmetrics function?
I am attempting to feed the lidR gridmetrics function a list of metrics. I can generate the list of metrics within a function (following this example):
myMetrics = function(z, i)
{
metrics = list(
...
1
vote
2answers
114 views
Getting statistics in cross sections at varying heights in LAS files?
I am looking to cross section my forest at varying heights. I have high return LAS data (8 points/m2 and average point spacing of 0.2m) and I am looking to do more than the simple 1, 2, 3 approach of ...
3
votes
1answer
278 views
Memory allocation error encountered when automating gridmetrics in R
I am trying to run Fusion's GridMetrics from R, I wrote this for one las file:
#First set up directories to keep the raw data
#separate from that produced by the analysis, Input (.las) and (.dtm),
#...
7
votes
2answers
538 views
Are PDAL or PCL capable of producing LiDAR grid metrics?
I typically use Windows-based FUSION to generate grid metrics, which can be used to describe forest structural characteristics. From the FUSION documentation:
GridMetrics computes a series of ...
