#!/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 24.07788991928101 56.92920853624553 -gcp 21600.0 0.0 24.103199243545536 56.93059601647727 -gcp 21600.0 21729.0 24.105913639068607 56.9168740866847 -gcp 0.0 21729.0 24.080657958984375 56.915204977987116 GX4799/GX_4799_SD_frame_24.jpg GX_4799_SD_frame_24.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "936.0 3096.0\n792.0 19704.0\n21312.0 19728.0\n21144.0 3000.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_24.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_24.vrt GX_4799_SD_frame_24.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_24.cut.vrt GX_4799_SD_frame_24.xyz