assign_crowncells_quantile: Assign Polygon Cells Their Quantile Value In A Raster

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(r, crowns, outpname_r, plott = F,
  quantiles_to_keep = NULL, outpname_shp)

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
outpname_r	A filename for the raster output
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

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.