#!/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 3079.5 3388.3657587548637 25.3766666 57.583333333333336 -gcp 22095.0 3784.760144524736 26.2766666 57.583333333333336 -gcp 22057.5 27313.73679822123 26.2766666 57 -gcp 2680.5 27057.3093385214 25.3766666 57 Latvijas_un_Igaunijas_topografiskas_kartes_Valmiera-Rauna_6828_A1_L36_17_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Valmiera-Rauna_6828_A1_L36_17_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "12579.75 3625.520821765686\n3078.75 3390.748750694059\n2856.0 15228.00249861188\n2679.0 27056.252915047196\n12352.5 27219.018323153803\n22056.75 27314.624791782342\n22081.125 15551.250832870628\n22092.5625 3784.686771238201" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Valmiera-Rauna_6828_A1_L36_17_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Valmiera-Rauna_6828_A1_L36_17_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Valmiera-Rauna_6828_A1_L36_17_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_Valmiera-Rauna_6828_A1_L36_17_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Valmiera-Rauna_6828_A1_L36_17_02.xyz