#!/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 25.26457429 56.20998589 -gcp 21381.0 0.0 25.30115554 56.23011076 -gcp 21381.0 20811.0 25.33947229 56.20962191 -gcp 0.0 20811.0 25.30061781 56.18843057 GX1006/GX_1006_SD_frame_129.jpg GX_1006_SD_frame_129.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "816.0 2472.0\n780.0 19128.0\n21336.0 19068.0\n21252.0 2424.0" | \
  gdaltransform -tps -output_xy GX_1006_SD_frame_129.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_1006_SD_frame_129.vrt GX_1006_SD_frame_129.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_1006_SD_frame_129.cut.vrt GX_1006_SD_frame_129.xyz