#!/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 25.499181747437 57.887391219671 -gcp 14682.0 0.0 25.525231361389 57.809422734463 -gcp 14682.0 20541.0 25.324281819002 57.788459945879 -gcp 0.0 20541.0 25.298037528992 57.865894807542 LVVA_F7404_US1_GV1238_0003.jpg LVVA_F7404_US1_GV1238_0003.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"834.0 10041.0\n3102.0 10071.0\n3088.5 12102.0\n3066.0 14041.5\n783.0 14013.0\" | \
  gdaltransform -tps -output_xy LVVA_F7404_US1_GV1238_0003.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  LVVA_F7404_US1_GV1238_0003.vrt LVVA_F7404_US1_GV1238_0003.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES LVVA_F7404_US1_GV1238_0003.cut.vrt LVVA_F7404_US1_GV1238_0003.xyz