#!/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 24.02956327708074 57.02415540073647 -gcp 21600.0 0.0 24.055382688432537 57.02696574339225 -gcp 21600.0 21606.0 24.060748608482392 57.01275478749816 -gcp 0.0 21606.0 24.034592434662255 57.00987184390189 GX4799/GX_4799_SD_frame_138.jpg GX_4799_SD_frame_138.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "960.0 2880.0\n1080.0 19368.0\n21288.0 19560.0\n21168.0 2856.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_138.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_138.vrt GX_4799_SD_frame_138.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_138.cut.vrt GX_4799_SD_frame_138.xyz