#!/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 24.038085937500004 56.97424307618869 -gcp 21600.0 0.0 24.063577028199834 56.97391541418368 -gcp 21600.0 21975.0 24.06316459178925 56.95975628152359 -gcp 0.0 21975.0 24.0376353263855 56.959893748315565 GX4799/GX_4799_SD_frame_62.jpg GX_4799_SD_frame_62.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "768.0 2928.0\n672.0 19656.0\n21168.0 19848.0\n21288.0 2988.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_62.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_62.vrt GX_4799_SD_frame_62.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_62.cut.vrt GX_4799_SD_frame_62.xyz