No output from GRASS 7 r.reclass in Processing Python script

Question

I want to run the r.reclass tool in python on a raster layer to reclassify 1 value (and leave the rest the way they are).

Here is my best attempt so far, after trying to reference documentation and other examples. Here is my code:

import processing

input_raster = QgsRasterLayer('/Users/ep9k/Desktop/Key-LogEcovaluator/Rasters/AestheticMax.tif', 'raster')
output_raster = '/Users/ep9k/Desktop/OutputReclass.tif'
rules_file = '/Users/ep9k/Desktop/reclassrules.txt'


parameters = {'Input' : input_raster,
            'rules' : rules_file,
            'Output' : output_raster,
            'GRASS_REGION_PARAMETER' : '1277290, 1314314, -14004, 11845',   #this is the exent of my raster layer
            'GRASS_REGION_CELLSIZE_PARAMETER' : 0
            }

processing.runAndLoadResults('grass7:r.reclass', parameters)

I run the script and I don't get any errors, but nothing happens. No output, nothing is reclassified. I think I am missing something obvious here.

Here is how I define my reclassification rules. As far as I can tell from the grass 7 documentation this is correct:

35 = 99

Really, I am reclassifying one value (35 = 99).

I get the help docs by running the following in the console:

processing.algorithmHelp("grass7:r.reclass")

Two of the input parameters are confusing to me. Specifically GRASS_RASTER_FORMAT_OPT and GRASS_RASTER_FORMAT_META. Are these required?

Answer 1

The raster type likely cannot hold negative values.

Run gdalinfo on AestheticMax.tif and you will likely find it is 8-bit integer.

So the answer is to convert the input raster to signed integer and then run it.

The raster type likely cannot hold negative values.

Run gdalinfo on AestheticMax.tif and you will likely find it is 8-bit integer.

From your link

In fact, the r.reclass program does not generate any new raster map layers (in the interests of disk space conservation). Instead, a reclass table is stored which will be used to reclassify the original raster map layer each time the new (reclassed) map name is requested. As far as the user (and programmer) is concerned, that raster map has been created.