#!/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 24.033081227525003 57.03405185466912 -gcp 21600.0 0.0 24.058674848540317 57.03796327874267 -gcp 21600.0 21915.0 24.06573059257963 57.02364918560225 -gcp 0.0 21915.0 24.039668856132153 57.02008593727159 GX4799/GX_4799_SD_frame_136.jpg GX_4799_SD_frame_136.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1248.0 2832.0\n1080.0 19680.0\n21480.0 20040.0\n21288.0 2928.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_136.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_136.vrt GX_4799_SD_frame_136.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_136.cut.vrt GX_4799_SD_frame_136.xyz