#!/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 1677.0 2380.6775986659254 23.5766666 57.083333333333336 -gcp 11316.0 2343.0858810450254 24.0266666 57.083333333333336 -gcp 11393.25 15862.650500277932 24.0266666 56.75 -gcp 1651.5 15882.193440800445 23.5766666 56.75 Latvijas_topografiskas_kartes_Slokas_apkartne__6828_A1_L30_4_02.JPG Latvijas_topografiskas_kartes_Slokas_apkartne__6828_A1_L30_4_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1677.0 2379.0\n11314.5 2341.5591995553086\n11393.25 15862.482490272372\n1650.0 15884.25125069483" | \
  gdaltransform -tps -output_xy Latvijas_topografiskas_kartes_Slokas_apkartne__6828_A1_L30_4_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_topografiskas_kartes_Slokas_apkartne__6828_A1_L30_4_02.vrt Latvijas_topografiskas_kartes_Slokas_apkartne__6828_A1_L30_4_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_topografiskas_kartes_Slokas_apkartne__6828_A1_L30_4_02.cut.vrt Latvijas_topografiskas_kartes_Slokas_apkartne__6828_A1_L30_4_02.xyz