#!/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 24.050886834039176 56.99415481903571 -gcp 21600.0 0.0 24.077444967529807 56.993094363855164 -gcp 21600.0 21729.0 24.07590286236751 56.978873680302996 -gcp 0.0 21729.0 24.049547543085946 56.97962459903423 GX4799/GX_4799_SD_frame_103.jpg GX_4799_SD_frame_103.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "960.0 2688.0\n1032.0 19464.0\n21360.0 19680.0\n21252.0 2628.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_103.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_103.vrt GX_4799_SD_frame_103.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_103.cut.vrt GX_4799_SD_frame_103.xyz