#!/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 25.73652506 56.97774289 -gcp 11091.0 0.0 25.77171564 56.88037089 -gcp 11091.0 10980.0 25.60187817 56.86643949 -gcp 0.0 10980.0 25.57004571 56.95533654 GX825/GX_825_SK_frame_87.jpg GX_825_SK_frame_87.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "528.0 1127.9732590529247\n10608.0 1031.9732590529247\n10800.0 9768.04011142061\n648.0 9768.04011142061" | \
  gdaltransform -tps -output_xy GX_825_SK_frame_87.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_825_SK_frame_87.vrt GX_825_SK_frame_87.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_825_SK_frame_87.cut.vrt GX_825_SK_frame_87.xyz