#!/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 24.031849988642733 57.01210635180981 -gcp 21600.0 0.0 24.058139765798963 57.01373716057723 -gcp 21600.0 21975.0 24.061373314127803 56.999301445320924 -gcp 0.0 21975.0 24.034928695553578 56.99723417155197 GX4799/GX_4799_SD_frame_141.jpg GX_4799_SD_frame_141.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "996.0 3180.0\n1104.0 19776.0\n21192.0 19848.0\n21204.0 3060.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_141.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_141.vrt GX_4799_SD_frame_141.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_141.cut.vrt GX_4799_SD_frame_141.xyz