#!/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 2757.0 3055.6033907726514 24.0266666 57.25 -gcp 28753.5 3054.4702612562537 25.2266666 57.25 -gcp 28818.0 29079.81628682602 25.2266666 56.583333333333336 -gcp 2281.5 29023.899388549195 24.0266666 56.583333333333336 Latvijas_un_Igaunijas_topografiskas_kartes_Lielvarde_6828_A1_L36_21_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Lielvarde_6828_A1_L36_21_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2757.0 3055.6033907726514\n17364.0 3090.0300166759307\n31972.5 3015.750416898277\n32178.0 29070.0\n24702.0 29103.019177320733\n17220.0 29067.010839355196\n11388.0 29094.026681489715\n2281.5 29023.899388549195" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Lielvarde_6828_A1_L36_21_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Lielvarde_6828_A1_L36_21_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Lielvarde_6828_A1_L36_21_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_Lielvarde_6828_A1_L36_21_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Lielvarde_6828_A1_L36_21_02.xyz