#!/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 24.094932675361637 56.90716292709324 -gcp 21600.0 0.0 24.069237112998962 56.90585658925434 -gcp 21600.0 21729.0 24.066828489303592 56.919872438541596 -gcp 0.0 21729.0 24.09258306026459 56.92137737983257 GX4799/GX_4799_SD_frame_28.jpg GX_4799_SD_frame_28.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "792.0 3240.0\n912.0 19728.0\n21360.0 19632.0\n20904.0 2904.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_28.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_28.vrt GX_4799_SD_frame_28.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_28.cut.vrt GX_4799_SD_frame_28.xyz