#!/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 26.92329567 57.2577531 -gcp 22206.0 0.0 26.93156719 57.34370777 -gcp 22206.0 21897.0 27.08934546 57.33948137 -gcp 0.0 21897.0 27.08206017 57.25385457 GX8464/GX_8464_SK_frame_248.jpg GX_8464_SK_frame_248.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2658.0 19947.0\n2634.0 19668.0\n2409.0 19248.0\n2043.0 18987.0\n1452.0 18870.0\n507.0 18945.0\n487.5 11440.5\n756.0 11239.5\n766.5 9856.5\n484.5 9562.5\n477.0 1803.0\n2415.0 1767.0\n2463.0 3.0\n10272.0 0.0\n10392.0 249.0\n11844.0 246.0\n11997.0 3.0\n21768.0 0.0\n21801.0 9531.0\n21528.0 9759.0\n21543.0 11142.0\n21822.0 11418.0\n21834.0 19116.0\n20988.0 19056.0\n20637.0 19077.0\n20361.0 19200.0\n20157.0 19362.0\n19968.0 19650.0\n19896.0 19947.0\n19902.0 20961.0\n16155.0 21016.5\n12096.0 21048.0\n11862.0 20754.0\n10488.0 20763.0\n10308.0 21006.0\n8700.0 20970.0\n5052.0 20907.0\n2601.0 20928.0" | \
  gdaltransform -tps -output_xy GX_8464_SK_frame_248.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_8464_SK_frame_248.vrt GX_8464_SK_frame_248.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_8464_SK_frame_248.cut.vrt GX_8464_SK_frame_248.xyz