#!/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 24.033644199371338 56.95486271840187 -gcp 21600.0 0.0 24.00743901729584 56.955576463984464 -gcp 21600.0 21915.0 24.008754558197957 56.96997634033199 -gcp 0.0 21915.0 24.034792184829715 56.96941574535095 GX4799/GX_4799_SD_frame_123.jpg GX_4799_SD_frame_123.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "744.0 2784.0\n600.0 19344.0\n20976.0 19392.0\n21000.0 2928.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_123.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_123.vrt GX_4799_SD_frame_123.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_123.cut.vrt GX_4799_SD_frame_123.xyz