#!/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 24.08187031745911 56.98578695315951 -gcp 21600.0 0.0 24.056024551391605 56.98820109727836 -gcp 21600.0 22038.0 24.059522151947025 57.002308725713405 -gcp 0.0 22038.0 24.086279869079593 57.00058208495819 GX4799/GX_4799_SD_frame_88.jpg GX_4799_SD_frame_88.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1008.0 3072.0\n960.0 19752.0\n21336.0 19776.0\n21228.0 2892.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_88.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_88.vrt GX_4799_SD_frame_88.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_88.cut.vrt GX_4799_SD_frame_88.xyz