#!/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 23.27796936 57.15423635 -gcp 16542.0 0.0 23.21363926 57.14275931 -gcp 16542.0 16035.0 23.19373026 57.17570807 -gcp 0.0 16035.0 23.25771332 57.18773918 GX18588/GX_18588_SK_frame_37.jpg GX_18588_SK_frame_37.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1392.0 1851.0\n15696.0 1439.959888579387\n15480.0 13895.933147632313\n1296.0 13944.280779944289" | \
  gdaltransform -tps -output_xy GX_18588_SK_frame_37.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_18588_SK_frame_37.vrt GX_18588_SK_frame_37.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_18588_SK_frame_37.cut.vrt GX_18588_SK_frame_37.xyz