#!/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 24.030296802520756 57.007418061153274 -gcp 21600.0 0.0 24.05606746673584 57.009605892436525 -gcp 21600.0 21975.0 24.060015678405765 56.995442590338186 -gcp 0.0 21975.0 24.034363031387333 56.99266071446909 GX4799/GX_4799_SD_frame_56.jpg GX_4799_SD_frame_56.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "720.0 2916.0\n744.0 19560.0\n21216.0 19872.0\n21084.0 2664.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_56.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_56.vrt GX_4799_SD_frame_56.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_56.cut.vrt GX_4799_SD_frame_56.xyz