#!/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 24.037007689476017 56.919986628961276 -gcp 21600.0 0.0 24.01147005289985 56.919734167784455 -gcp 21600.0 22101.0 24.010868625998246 56.93390824557503 -gcp 0.0 22101.0 24.03657048940659 56.93432790906092 GX4799/GX_4799_SD_frame_116.jpg GX_4799_SD_frame_116.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "972.0 3084.0\n912.0 19800.0\n21264.0 19992.0\n21216.0 3120.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_116.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_116.vrt GX_4799_SD_frame_116.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_116.cut.vrt GX_4799_SD_frame_116.xyz