#!/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 27.02406895 56.99305112 -gcp 21498.0 0.0 27.0330168 56.89637796 -gcp 21498.0 21252.0 26.86322677 56.89572185 -gcp 0.0 21252.0 26.85661781 56.98506463 GX825/GX_825_SK_frame_107.jpg GX_825_SK_frame_107.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2478.0 20058.0\n2088.0 19344.0\n1482.0 18996.0\n714.0 18762.0\n420.0 18468.0\n276.0 17964.0\n369.0 11538.0\n426.0 9618.0\n483.0 1731.0\n2412.0 1746.0\n2418.0 108.0\n10380.0 426.0\n11820.0 444.0\n12258.0 216.0\n16554.0 207.0\n20979.0 252.0\n21411.0 393.0\n21486.0 6981.0\n21399.0 7509.0\n21324.0 8244.0\n21318.0 9999.0\n21231.0 10143.0\n21225.0 11505.0\n21315.0 11688.0\n21426.0 21243.0\n13452.0 21174.0\n12492.0 21162.0\n11664.0 20982.0\n10806.0 20946.0\n2556.0 21090.0" | \
  gdaltransform -tps -output_xy GX_825_SK_frame_107.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_825_SK_frame_107.vrt GX_825_SK_frame_107.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_825_SK_frame_107.cut.vrt GX_825_SK_frame_107.xyz