#!/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 24.36935484 57.85301248 -gcp 21600.0 0.0 24.31832813 57.86328237 -gcp 21600.0 21852.0 24.33775377 57.89110507 -gcp 0.0 21852.0 24.38973963 57.88056659 GX4195/GX_4195_SD_frame_26.jpg GX_4195_SD_frame_26.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "912.0 3600.0\n1032.0 19680.0\n21504.0 20160.0\n21408.0 3216.0" | \
  gdaltransform -tps -output_xy GX_4195_SD_frame_26.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4195_SD_frame_26.vrt GX_4195_SD_frame_26.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4195_SD_frame_26.cut.vrt GX_4195_SD_frame_26.xyz