#!/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 24.081767184684423 57.000086305790646 -gcp 21600.0 0.0 24.055777788162235 57.001712736945024 -gcp 21600.0 22038.0 24.057773351669315 57.015886797547346 -gcp 0.0 22038.0 24.08434331417084 57.014997514662525 GX4799/GX_4799_SD_frame_91.jpg GX_4799_SD_frame_91.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "984.0 3024.0\n792.0 19656.0\n21264.0 19848.0\n21072.0 2952.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_91.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_91.vrt GX_4799_SD_frame_91.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_91.cut.vrt GX_4799_SD_frame_91.xyz