#!/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 26.3786893 56.05869885 -gcp 21600.0 0.0 26.32726573 56.06108098 -gcp 21600.0 21975.0 26.3305984 56.09117124 -gcp 0.0 21975.0 26.38490577 56.0890646 GX4599/GX_4599_SD_frame_55.jpg GX_4599_SD_frame_55.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "840.0 2500.3635864257812\n809.454345703125 19494.544921875\n21282.54638671875 19735.636962890625\n21283.6376953125 2487.2728271484375" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_55.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_55.vrt GX_4599_SD_frame_55.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_55.cut.vrt GX_4599_SD_frame_55.xyz