#!/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 24.03217971324921 57.01988901990677 -gcp 21600.0 0.0 24.05821077777419 57.021664628918295 -gcp 21600.0 21975.0 24.06190064145584 57.007115735064495 -gcp 0.0 21975.0 24.035287505976765 57.00519886491796 GX4799/GX_4799_SD_frame_139.jpg GX_4799_SD_frame_139.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1104.0 2976.0\n1032.0 19752.0\n21408.0 19968.0\n21216.0 2904.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_139.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_139.vrt GX_4799_SD_frame_139.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_139.cut.vrt GX_4799_SD_frame_139.xyz