#!/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 24.068545103073124 57.019186729574486 -gcp 21600.0 0.0 24.093920454402777 57.021091624897295 -gcp 21600.0 21852.0 24.09796306921664 57.007193091148196 -gcp 0.0 21852.0 24.072334469393844 57.0048743187007 GX4799/GX_4799_SD_frame_8.jpg GX_4799_SD_frame_8.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "744.0 2928.0\n792.0 19872.0\n21240.0 20088.0\n21036.0 2892.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_8.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_8.vrt GX_4799_SD_frame_8.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_8.cut.vrt GX_4799_SD_frame_8.xyz