Usage: gdal raster viewshed [OPTIONS] <INPUT> <OUTPUT>
Compute the viewshed of a raster dataset.
Positional arguments:


  -i, --input <INPUT>                                  Input raster datasets [required]


  -o, --output <OUTPUT>                                Output raster dataset [required]
Common Options:


  -h, --help                                           Display help message and exit


  --json-usage                                         Display usage as JSON document and exit


  --config <KEY>=<VALUE>                               Configuration option [may be repeated]


  -q, --quiet                                          Quiet mode (no progress bar)
Options:


  -f, --of, --format, --output-format <OUTPUT-FORMAT>  Output format ("GDALG" allowed)


  --co, --creation-option <KEY>=<VALUE>                Creation option [may be repeated]


  --overwrite                                          Whether overwriting existing output is allowed


                                                       Mutually exclusive with --append


  --append                                             Append as a subdataset to existing output


                                                       Mutually exclusive with --overwrite


  -p, --pos, --position <X,Y> or <X,Y,H>               Observer position [2..3 values]


  -z, --height <HEIGHT>                                Observer height


  --target-height <TARGET-HEIGHT>                      Height of the target above the DEM surface in the height unit of the DEM. (default: 0)


  --mode <MODE>                                        Sets what information the output contains.. MODE=normal|DEM|ground|cumulative (default: normal)


  --max-distance <MAX-DISTANCE>                        Maximum distance from observer to compute visibility. It is also used to clamp the extent of the output raster.


  --min-distance <MIN-DISTANCE>                        Mask all cells less than this distance from the observer. Must be less than 'max-distance'.


  --start-angle <START-ANGLE>                          Mask all cells outside of the arc ('start-angle', 'end-angle'). Clockwise degrees from north. Also used to clamp the extent of the output raster.


  --end-angle <END-ANGLE>                              Mask all cells outside of the arc ('start-angle', 'end-angle'). Clockwise degrees from north. Also used to clamp the extent of the output raster.


  --high-pitch <HIGH-PITCH>                            Mark all cells out-of-range where the observable height would be higher than the 'high-pitch' angle from the observer. Degrees from horizontal - positive is up. Must be greater than 'low-pitch'.


  --low-pitch <LOW-PITCH>                              Bound observable height to be no lower than the 'low-pitch' angle from the observer. Degrees from horizontal - positive is up. Must be less than 'high-pitch'.


  --curvature-coefficient <CURVATURE-COEFFICIENT>      Coefficient to consider the effect of the curvature and refraction.


  -b, --band <BAND>                                    Input band (1-based index) (default: 1)


  --visible-value <VISIBLE-VALUE>                      Pixel value to set for visible areas (default: 255)


  --invisible-value <INVISIBLE-VALUE>                  Pixel value to set for invisible areas (default: 0)


  --out-of-range-value <OUT-OF-RANGE-VALUE>            Pixel value to set for the cells that fall outside of the range specified by the observer location and the maximum distance (default: 0)


  --dst-nodata <DST-NODATA>                            The value to be set for the cells in the output raster that have no data.


  --observer-spacing <OBSERVER-SPACING>                Cell Spacing between observers (default: 10)


  -j, --num-threads <NUM-THREADS>                      Number of jobs (or ALL_CPUS) (default: 3)
Advanced Options:


  --if, --input-format <INPUT-FORMAT>                  Input formats [may be repeated]


  --oo, --open-option <KEY>=<VALUE>                    Open options [may be repeated]

However this algorithm is not natively streaming compatible. Consequently a temporary dataset will be generated, which may cause significant processing time at opening.