#!/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 25.18642552 56.70715888 -gcp 14247.0 0.0 25.16063983 56.62311619 -gcp 14247.0 14298.0 24.9922275 56.62914672 -gcp 0.0 14298.0 25.01358218 56.72975056 GX2261/GX_2261_SK_frame_135.jpg GX_2261_SK_frame_135.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1536.0 627.0\n11400.0 624.0\n11568.0 13056.33426183844\n1296.0 13176.173816155988" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_135.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_135.vrt GX_2261_SK_frame_135.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_135.cut.vrt GX_2261_SK_frame_135.xyz