treepos_GWS | R Documentation |
Find potential tree positions using a canopy height model by using an iterative watershed algorithm. Basically returns a vector data sets with the tree crown geometries and a bunch of corresponding indices.
treepos_GWS( chm = NULL, minTreeAlt = 10, minTreeAltParam = "chmQ20", minCrownArea = 3, maxCrownArea = 150, join = 1, thresh = 0.1, split = TRUE, cores = parallel::detectCores(), giLinks = NULL )
chm |
raster* canopy height model |
minTreeAlt |
numeric. minimum height of trees to be integrated in the analysis |
minTreeAltParam |
character. code for the percentile that is used as tree height treshold. It is build using the key letters |
minCrownArea |
numeric. minimum area in square meter (if you use projected data) of the projected tree crowns |
maxCrownArea |
numeric. maximum area in square meter (if you use projected data) of the projected tree crowns |
join |
numeric. Join Segments based on Threshold Value, 0=no join, 1=treepos_GWS2saddle diff, 2=treepos_GWS2treepos diff. see also SAGA GIS Help |
thresh |
numeric. Specify a threshold value as minimum difference between neighboured segments in meter. see also SAGA GIS Help |
split |
split polygons default is TRUE |
cores |
number of cores to be used |
giLinks |
list. of GI tools cli paths |
raster* object
return raster* object
Chris Reudenbach
## Not run: # required packages require(uavRst) require(link2GI) # create and check the links to the GI software giLinks<-uavRst::linkGI() if (giLinks$saga$exist & giLinks$otb$exist & giLinks$grass$exist) { # project folder projRootDir<-tempdir() # create subfolders please mind that the pathes are exported as global variables paths<-link2GI::initProj(projRootDir = projRootDir, projFolders = c("data/","data/ref/","output/","run/","las/"), global = TRUE, path_prefix = "path_") data(chm_seg) # calculate treepos using uavRst generic approach tPos <- uavRst::treepos_GWS(chm = chm_seg[[1]], minTreeAlt = 2, maxCrownArea = 150, join = 1, thresh = 0.35, split=TRUE, cores=1, giLinks = giLinks ) } ##+ ## End(Not run)
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