#!/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 23.32524 57.08134078 -gcp 17754.0 0.0 23.269943 57.05903841 -gcp 17754.0 17817.0 23.2289956 57.09157235 -gcp 0.0 17817.0 23.28720459 57.11156548 GX18588/GX_18588_SK_frame_32.jpg GX_18588_SK_frame_32.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2928.0 1968.0\n2928.0 15408.0\n15960.0 15456.0\n15984.0 1896.0" | \
  gdaltransform -tps -output_xy GX_18588_SK_frame_32.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_18588_SK_frame_32.vrt GX_18588_SK_frame_32.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_18588_SK_frame_32.cut.vrt GX_18588_SK_frame_32.xyz