#!/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 25.86337546 57.04189575 -gcp 21600.0 0.0 25.8775235 57.12442711 -gcp 21600.0 23217.0 26.0397672 57.11912639 -gcp 0.0 23217.0 26.03031702 57.03318474 GX10525/GX_10525_SK_frame_508.jpg GX_10525_SK_frame_508.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "912.0 4272.0\n2016.0 21120.0\n21240.0 21060.0\n21120.0 3360.0" | \
  gdaltransform -tps -output_xy GX_10525_SK_frame_508.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10525_SK_frame_508.vrt GX_10525_SK_frame_508.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10525_SK_frame_508.cut.vrt GX_10525_SK_frame_508.xyz