#!/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 24.03021633625031 56.98953377805133 -gcp 21600.0 0.0 24.004563689231876 56.98962729771752 -gcp 21600.0 21915.0 24.004370570182804 57.003632137222844 -gcp 0.0 21915.0 24.030098319053653 57.00390966788145 GX4799/GX_4799_SD_frame_130.jpg GX_4799_SD_frame_130.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "960.0 2856.0\n960.0 19560.0\n21312.0 19752.0\n21240.0 2796.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_130.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_130.vrt GX_4799_SD_frame_130.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_130.cut.vrt GX_4799_SD_frame_130.xyz