#!/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 24.38839212 57.49524037 -gcp 21600.0 0.0 24.33295092 57.49590394 -gcp 21600.0 21852.0 24.33407959 57.52699342 -gcp 0.0 21852.0 24.39127184 57.52531352 GX4195/GX_4195_SD_frame_5.jpg GX_4195_SD_frame_5.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1176.0 3288.0\n1056.0 19176.0\n21504.0 19344.0\n21336.0 3168.0" | \
  gdaltransform -tps -output_xy GX_4195_SD_frame_5.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4195_SD_frame_5.vrt GX_4195_SD_frame_5.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4195_SD_frame_5.cut.vrt GX_4195_SD_frame_5.xyz