#!/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 24.04751430283001 57.021881995368034 -gcp 21600.0 0.0 24.073692670120824 57.02354913923892 -gcp 21600.0 21729.0 24.07675963108204 57.009207426855006 -gcp 0.0 21729.0 24.050436958786413 57.00747055844583 GX4799/GX_4799_SD_frame_97.jpg GX_4799_SD_frame_97.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "852.0 3180.0\n960.0 19632.0\n21240.0 19848.0\n21096.0 3024.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_97.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_97.vrt GX_4799_SD_frame_97.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_97.cut.vrt GX_4799_SD_frame_97.xyz