#!/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 24.084815382957462 56.92525364173319 -gcp 21600.0 0.0 24.059270024299625 56.92470326049167 -gcp 21600.0 21729.0 24.05832052230835 56.938881770238055 -gcp 0.0 21729.0 24.08409655094147 56.93935292875833 GX4799/GX_4799_SD_frame_32.jpg GX_4799_SD_frame_32.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "888.0 3144.0\n912.0 19500.0\n21288.0 19272.0\n21168.0 2760.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_32.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_32.vrt GX_4799_SD_frame_32.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_32.cut.vrt GX_4799_SD_frame_32.xyz