run_UDF: Run an UDF on a 'stars' object created from generic GeoTIFF...

In pramitghosh/OpenEO.R.UDF: User-defined functions (UDF) in R on Earth observation data in cloud back-ends

Description

Reads generic files from disk by looking up a legend file, runs the User Defined Function (UDF) specified by the user and writes back the results to disk as a multi-band GeoTIFF file named 'out.tif' in the directory specified by the user.

Usage

run_UDF(legend_name = "legend.csv", function_name, drop_dim,
  in_dim = c(1, 1, 1, 1, 1), out_dir = "results")

Arguments

legend_name	Name of the legend file as a string (default: "legend.csv")
function_name	Name of the User-Defined Function (UDF) the user defined in his own script
drop_dim	Numeric value (or vector) representing the dimension number of the dimension to be dropped. (1,2 = Space, 3 = Band, 4 = Time, 5 = Whether raster)
in_dim	Dimensionality of the incoming Collection object (default: 'c(1,1,1,1,1)' representing spatial multi-band, multi-temporal raster)
out_dir	Path of the directory where the resulting files are to be written to disk (default: "results")

Details

The semantics of the written multi-band GeoTIFF depends on the argument 'drop_dim'. For example, if 'drop_dim = 4' the bands in the output file represent bands while if 'drop_dim = 3', the bands in the output file represent time. This modification of the dimensionality ('drop_dim') as well as the dimensionality of the incoming Collection object ('in_dim') would be controlled by the backend as parameters passed on to the UDF server as metadata files along with the legend file ('legend_name').

pramitghosh/OpenEO.R.UDF documentation built on Dec. 4, 2019, 4:58 a.m.