#!/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 24.075765609741214 56.958121265264516 -gcp 21600.0 0.0 24.10131633281708 56.95929708026576 -gcp 21600.0 21729.0 24.103519025757535 56.94544542655957 -gcp 0.0 21729.0 24.078151781781905 56.943968398080465 GX4799/GX_4799_SD_frame_19.jpg GX_4799_SD_frame_19.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "744.0 2832.0\n792.0 19536.0\n21264.0 19680.0\n21024.0 2844.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_19.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_19.vrt GX_4799_SD_frame_19.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_19.cut.vrt GX_4799_SD_frame_19.xyz