#!/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 3306.054595086442 2259.5036131183992 23.1266666 59 -gcp 21538.679481346677 2282.3721511951085 24.0266666 59 -gcp 21699.0 32559.025818989452 24.0266666 58.25 -gcp 3003.1555959963603 32510.387159533075 23.1266666 58.25 Latvijas_un_Igaunijas_topografiskas_kartes_Hapsala_6828_A1_L36_6_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Hapsala_6828_A1_L36_6_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "12420.0 2277.0033314825096\n3306.0 2259.0\n3145.5 17388.001665741256\n3003.0 32511.0\n12342.0 32559.025818989452\n21699.0 32514.0\n21631.5 17401.50249861188\n21540.0 2280.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Hapsala_6828_A1_L36_6_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Hapsala_6828_A1_L36_6_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Hapsala_6828_A1_L36_6_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_Hapsala_6828_A1_L36_6_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Hapsala_6828_A1_L36_6_02.xyz