#!/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 24.02641832828522 57.00614444612509 -gcp 21600.0 0.0 24.000797867774967 57.00605680976171 -gcp 21600.0 21915.0 24.00042026372754 57.01992159279329 -gcp 0.0 21915.0 24.025696570279067 57.020358360438756 GX4799/GX_4799_SD_frame_133.jpg GX_4799_SD_frame_133.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "936.0 3192.0\n912.0 19512.0\n21312.0 19872.0\n21216.0 3024.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_133.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_133.vrt GX_4799_SD_frame_133.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_133.cut.vrt GX_4799_SD_frame_133.xyz