#!/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 24.02917056027387 57.03836718201383 -gcp 21600.0 0.0 24.053848000216306 57.04396128935742 -gcp 21600.0 21915.0 24.06400091895318 57.03014464509823 -gcp 0.0 21915.0 24.03892607091637 57.02506376740209 GX4799/GX_4799_SD_frame_135.jpg GX_4799_SD_frame_135.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1020.0 2580.0\n984.0 19488.0\n21288.0 19632.0\n21240.0 2856.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_135.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_135.vrt GX_4799_SD_frame_135.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_135.cut.vrt GX_4799_SD_frame_135.xyz