#!/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 24.026783108711246 57.02073584203455 -gcp 21600.0 0.0 24.05163109302521 57.02460469775828 -gcp 21600.0 21975.0 24.058870375156406 57.01061505561928 -gcp 0.0 21975.0 24.034051895141605 57.00692439384431 GX4799/GX_4799_SD_frame_53.jpg GX_4799_SD_frame_53.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "744.0 2712.0\n720.0 19632.0\n21144.0 20088.0\n21096.0 2952.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_53.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_53.vrt GX_4799_SD_frame_53.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_53.cut.vrt GX_4799_SD_frame_53.xyz