#!/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 24.14578333 56.91246667 -gcp 21600.0 0.0 24.09635 56.90766667 -gcp 21600.0 21729.0 24.08535 56.9351 -gcp 0.0 21729.0 24.13746667 56.94128333 GX2200/GX_2200_SD_frame_75.jpg GX_2200_SD_frame_75.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1152.0 3408.4002223457464\n1080.0 19776.053362979434\n20928.0 19703.78654808227\n21168.0 3336.093385214008" | \
  gdaltransform -tps -output_xy GX_2200_SD_frame_75.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2200_SD_frame_75.vrt GX_2200_SD_frame_75.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2200_SD_frame_75.cut.vrt GX_2200_SD_frame_75.xyz