#!/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 2205.0 2340.0 21.6 57.75 -gcp 21219.0 2367.0 22.5 57.75 -gcp 21291.0 12510.0 22.5 57.5 -gcp 2139.0 12420.0 21.6 57.5 lvva/Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Ventspils-ZA_6828_A1_L31_2_02.JPG Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Ventspils-ZA_6828_A1_L31_2_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2205.0 2340.0\n21219.0 2367.0\n21291.0 12510.0\n2139.0 12420.0" | \
  gdaltransform -tps -output_xy Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Ventspils-ZA_6828_A1_L31_2_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Ventspils-ZA_6828_A1_L31_2_02.vrt Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Ventspils-ZA_6828_A1_L31_2_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Ventspils-ZA_6828_A1_L31_2_02.cut.vrt Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Ventspils-ZA_6828_A1_L31_2_02.xyz