#!/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 2869.5 3991.6851028349083 24.0266666 59 -gcp 30249.0 3814.705947748749 25.3766666 59 -gcp 30714.0 34203.29516397999 25.3766666 58.25 -gcp 2710.5 34234.86853807671 24.0266666 58.25 Latvijas_un_Igaunijas_topografiskas_kartes_Pernava_6828_A1_L36_7_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Pernava_6828_A1_L36_7_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "16555.5 4008.059966685175\n9720.0 4036.520821765686\n2868.0 3988.499167129373\n2763.0 19109.999167129372\n2709.0 34234.55247084953\n16710.0 34267.5274847307\n30714.0 34201.44752915047\n30513.0 19011.00249861188\n30246.0 3812.99666851749" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Pernava_6828_A1_L36_7_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Pernava_6828_A1_L36_7_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Pernava_6828_A1_L36_7_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_un_Igaunijas_topografiskas_kartes_Pernava_6828_A1_L36_7_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Pernava_6828_A1_L36_7_02.xyz