#!/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 2067.0 1869.0 24.476666666666667 56.75 -gcp 11868.0 1956.0 24.926666666666666 56.75 -gcp 11832.0 12054.0 24.926666666666666 56.5 -gcp 1995.0 11982.0 24.476666666666667 56.5 Latvijas_topografiskas_kartes_Lielvardes_apkartne__6828_A1_L30_3_02.JPG Latvijas_topografiskas_kartes_Lielvardes_apkartne__6828_A1_L30_3_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2067.0 1865.9966648137856\n1995.0 11981.247915508617\n11830.5 12055.497498610339\n11869.5 1954.4991662034463" | \
  gdaltransform -tps -output_xy Latvijas_topografiskas_kartes_Lielvardes_apkartne__6828_A1_L30_3_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_topografiskas_kartes_Lielvardes_apkartne__6828_A1_L30_3_02.vrt Latvijas_topografiskas_kartes_Lielvardes_apkartne__6828_A1_L30_3_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_topografiskas_kartes_Lielvardes_apkartne__6828_A1_L30_3_02.cut.vrt Latvijas_topografiskas_kartes_Lielvardes_apkartne__6828_A1_L30_3_02.xyz