#!/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 2307.0 2229.0 24 56.5 -gcp 18645.0 2460.0 24.75 56.5 -gcp 18477.0 22653.0 24.75 56 -gcp 1905.0 22467.0 24 56 lvva/Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Riga-_DR_6828_A1_L31_28_02.JPG Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Riga-_DR_6828_A1_L31_28_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2307.0 2229.0\n18645.0 2460.0\n18477.0 22653.0\n1905.0 22467.0" | \
  gdaltransform -tps -output_xy Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Riga-_DR_6828_A1_L31_28_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Riga-_DR_6828_A1_L31_28_02.vrt Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Riga-_DR_6828_A1_L31_28_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_Riga-_DR_6828_A1_L31_28_02.cut.vrt Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Riga-_DR_6828_A1_L31_28_02.xyz