#!/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 25.49980402 56.93092107 -gcp 10980.0 0.0 25.51596165 57.02632321 -gcp 10980.0 11091.0 25.68764448 57.01573914 -gcp 0.0 11091.0 25.6739974 56.92570465 GX825/GX_825_SK_frame_63.jpg GX_825_SK_frame_63.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "432.0 1203.0\n10584.0 1055.9732590529247\n10608.0 9792.04011142061\n480.0 9720.04011142061" | \
  gdaltransform -tps -output_xy GX_825_SK_frame_63.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_825_SK_frame_63.vrt GX_825_SK_frame_63.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_825_SK_frame_63.cut.vrt GX_825_SK_frame_63.xyz