#!/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 24.049064095016778 56.95602159892138 -gcp 21600.0 0.0 24.07457780628045 56.95540563190321 -gcp 21600.0 22101.0 24.073719468514543 56.941396224210244 -gcp 0.0 22101.0 24.04807586641491 56.94164411692825 GX4799/GX_4799_SD_frame_109.jpg GX_4799_SD_frame_109.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1176.0 2712.0\n888.0 19392.0\n21192.0 19368.0\n21144.0 2784.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_109.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_109.vrt GX_4799_SD_frame_109.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_109.cut.vrt GX_4799_SD_frame_109.xyz