#!/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 23.22814213 56.7245844 -gcp 21600.0 0.0 23.19267284 56.62289068 -gcp 21600.0 20982.0 23.0237596 56.63965651 -gcp 0.0 20982.0 23.03983684 56.73325593 GX2685/GX_2685A_SK_frame_102.jpg GX_2685A_SK_frame_102.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1200.0 2520.0\n1128.0 19032.0\n21312.0 19368.0\n21384.0 2328.0" | \
  gdaltransform -tps -output_xy GX_2685A_SK_frame_102.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2685A_SK_frame_102.vrt GX_2685A_SK_frame_102.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2685A_SK_frame_102.cut.vrt GX_2685A_SK_frame_102.xyz