#!/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 1860.0 3306.0 22.5 57.5 -gcp 23040.0 3360.0 23.5 57.5 -gcp 23148.0 23547.0 23.5 57 -gcp 1722.0 23526.0 22.5 57 lvva/Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Talsi-_DR_6828_A1_L31_6_02.JPG Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Talsi-_DR_6828_A1_L31_6_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1860.0 3306.0\n23040.0 3360.0\n23148.0 21297.004524886877\n22050.0 21989.775263951735\n21693.0 22302.064856711917\n20844.0 22358.787330316743\n20628.0 22455.015082956263\n20088.0 22493.761689291103\n19779.0 22694.984917043737\n19551.0 22955.960784313724\n19386.0 23577.004524886877\n1722.0 23526.0" | \
  gdaltransform -tps -output_xy Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Talsi-_DR_6828_A1_L31_6_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Talsi-_DR_6828_A1_L31_6_02.vrt Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Talsi-_DR_6828_A1_L31_6_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_Talsi-_DR_6828_A1_L31_6_02.cut.vrt Igaunijas_un_Latvijas_terit._dalu_topogr._kartes_Talsi-_DR_6828_A1_L31_6_02.xyz