#!/bin/bash

GDAL_TILE_PROCESSES=16
GDAL_TILE_ZOOMS=8-14
GDAL_SAMPLING_WARP=cubic
GDAL_SAMPLING_TILE=antialias

# Create virtual dataset with coordinates
gdal_translate -of VRT -a_srs EPSG:4326 -outsize 300% 300% -gcp 0.0 0.0 26.7711012 56.85617884 -gcp 21369.0 0.0 26.78603574 56.95091773 -gcp 21369.0 21186.0 26.95358829 56.9395382 -gcp 0.0 21186.0 26.9371088 56.85099454 GX825/GX_825_SK_frame_129.jpg GX_825_SK_frame_129.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2478.0 19872.0\n2124.0 19380.0\n1620.0 19062.0\n378.0 18948.0\n354.0 12924.0\n372.0 12036.0\n636.0 11358.0\n636.0 9924.0\n354.0 9492.0\n375.0 1821.0\n2259.0 1803.0\n2259.0 108.0\n9519.0 192.0\n10098.0 483.0\n11634.0 495.0\n12120.0 231.0\n16842.0 126.0\n20916.0 141.0\n21048.0 5454.0\n21042.0 11526.0\n21060.0 15498.0\n21084.0 19194.0\n20478.0 19512.0\n19896.0 20112.0\n19806.0 20892.0\n11868.0 20844.0\n9690.0 20874.0\n6168.0 20850.0\n2700.0 20850.0" | \
  gdaltransform -tps -output_xy GX_825_SK_frame_129.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_825_SK_frame_129.vrt GX_825_SK_frame_129.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_825_SK_frame_129.cut.vrt GX_825_SK_frame_129.xyz