#!/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 24.084992408752445 56.92497845212716 -gcp 21600.0 0.0 24.05965089797974 56.92517167057343 -gcp 21600.0 21852.0 24.059720635414124 56.939208070095425 -gcp 0.0 21852.0 24.085421562194828 56.93927391501197 GX4799/GX_4799_SD_frame_75.jpg GX_4799_SD_frame_75.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "792.0 2832.0\n840.0 19632.0\n21240.0 19752.0\n21096.0 2832.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_75.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_75.vrt GX_4799_SD_frame_75.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_75.cut.vrt GX_4799_SD_frame_75.xyz