#!/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 1576.5 2424.287330316742 24.4766666 57.25 -gcp 11167.5 2457.1855203619907 24.926666599999997 57.25 -gcp 11220.0 12594.32503770739 24.926666599999997 57 -gcp 1528.5 12549.468325791855 24.4766666 57 Latvijas_topografiskas_kartes_Incukalns__6828_A1_L30_11_02.JPG Latvijas_topografiskas_kartes_Incukalns__6828_A1_L30_11_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1573.5 2422.526395173454\n11167.5 2455.552036199095\n11217.0 12592.490196078432\n1527.0 12547.575791855204" | \
  gdaltransform -tps -output_xy Latvijas_topografiskas_kartes_Incukalns__6828_A1_L30_11_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_topografiskas_kartes_Incukalns__6828_A1_L30_11_02.vrt Latvijas_topografiskas_kartes_Incukalns__6828_A1_L30_11_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_topografiskas_kartes_Incukalns__6828_A1_L30_11_02.cut.vrt Latvijas_topografiskas_kartes_Incukalns__6828_A1_L30_11_02.xyz