#!/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 24.13225761 56.98027958 -gcp 21600.0 0.0 24.08148481 56.97636378 -gcp 21600.0 21729.0 24.07347722 57.00381265 -gcp 0.0 21729.0 24.12474807 57.0084658 GX2200/GX_2200_SD_frame_81.jpg GX_2200_SD_frame_81.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "912.0 3120.1067259588654\n864.0 19391.879933296274\n21264.0 19296.053362979437\n21048.0 3119.9866592551416" | \
  gdaltransform -tps -output_xy GX_2200_SD_frame_81.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2200_SD_frame_81.vrt GX_2200_SD_frame_81.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2200_SD_frame_81.cut.vrt GX_2200_SD_frame_81.xyz