function used to compute spectral indexes, given the index formula
MODIStsp_process_indexes(out_filename, formula, bandnames, nodata_out,
out_prod_folder, indexes_nodata_out, file_prefix, compress, yy, DOY,
out_format, scale_val)
Arguments
out_filename |
character basename of the file in to which save results
|
formula |
character Index formula, as derived from XML file and stored in prod_opts
within previous_file
|
bandnames |
character array of names of original HDF layer. Used to identify the
bands required for index computation
|
nodata_out |
character array of NoData values of reflectance bands
|
out_prod_folder |
character output folder for the product used to retrieve filenames
of rasters of original bands to be used in computations
|
indexes_nodata_out |
character NoData value for resulting raster
|
file_prefix |
character used to retrieve filenames of rasters of original bands
to be used in computations
|
compress |
character compression option for GTiff files
|
yy |
character year string used to retrieve filenames of rasters of original bands
to be used in computations
|
DOY |
character doy string used to retrieve filenames of rasters of original bands to be
used in computations
|
out_format |
character string used to retrieve filenames of rasters of original bands
to be used in computations
|
scale_val |
character (Yes/No) if Yes, output values in are computed as float -1 - 1,
otherwise integer -10000 - 10000
|
Value
NULL - new raster file saved in out_filename
Details
the function parses the index formula to identify the required bands. On the basis
of identified bands, it retrieves the reflectance bands required, gets the data into R raster
objects, performs the computation and stores results in a GeoTiff or ENVI raster file
Note
License: GPL 3.0