#!/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 24.08406436443329 56.971526865930535 -gcp 21600.0 0.0 24.058046936988834 56.97366125678851 -gcp 21600.0 22038.0 24.060981273651127 56.987680871222324 -gcp 0.0 22038.0 24.087744355201725 56.986377351534 GX4799/GX_4799_SD_frame_85.jpg GX_4799_SD_frame_85.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1104.0 3000.0\n912.0 19680.0\n21264.0 19800.0\n21144.0 2976.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_85.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_85.vrt GX_4799_SD_frame_85.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_85.cut.vrt GX_4799_SD_frame_85.xyz