#!/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 24.051617609477397 56.96835996476989 -gcp 21600.0 0.0 24.077057859516284 56.96772495657226 -gcp 21600.0 21606.0 24.076126202578806 56.95392564266097 -gcp 0.0 21606.0 24.050509974566495 56.954369734526445 GX4799/GX_4799_SD_frame_107.jpg GX_4799_SD_frame_107.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1128.0 2976.0\n1032.0 19392.0\n21312.0 19560.0\n21264.0 3000.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_107.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_107.vrt GX_4799_SD_frame_107.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_107.cut.vrt GX_4799_SD_frame_107.xyz