assign_crowncells_quantile_parallel: Assign Polygon Cells Their Quantile Value In A Raster in...

In pieterbeck/CanHeMonR: Tools for canopy health monitoring through image analysis

Description

Overlay a polygon shapefile on a raster, so that each cell gets assigned its quantile value calculated from all the raster values falling in that that particular polygon. Optionally, write away a polygon shapefile of the crowns where only there portions with specified quantile values are kept.

Usage

assign_crowncells_quantile_parallel(r, crowns, plott = F,
  quantiles_to_keep = NULL, outpname_shp, parallel = F, nWorkers = 2)

Arguments

r	The single-layer raster object to draw values from, and that will serve as the spatial template for the output
crowns	A polygon shapefile or a SpatialPolygons(dataframe) that overlays r
plott	Do you want to plot the result for each crown? Default is F
quantiles_to_keep	Integer vector with quantiles to keep in trimmed crowns output. Only considered if outpname_shp is not NULL.
outpname_shp	The output filename for trimmed polygons. These retain only the part of the polygon with quantile values inside quantiles_to_keep. If set to NULL, quantiles_to_keep is ignored and no vectorized output is written away. Default is NULL
parallel	Logical. Would you like the data to be processed in parallel? Default is False.
nWorkers	If running the code in parallel, how many workers should be used? Default is 4.

Details

Writes away both 1) a raster file, with the same spatial attributes as r and quantile values between 0 and 100 for cells in polygons, and NA outside polygons, a and 2) a shapefile with trimmed polygons

Value

A raster file, with the same spatial attributes as r and quantile values between 0 and 100 for cells in polygons, and NA outside polygons

Note

Write a line that checks wether a polygon intersects with the raster

pieterbeck/CanHeMonR documentation built on May 25, 2019, 7:11 a.m.