#!/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 1577.4352780309937 2076.104224569205 24.926666599999997 57 -gcp 11250.45259799453 2020.7042801556418 25.3766666 57 -gcp 11339.514585232453 12121.051834352418 25.3766666 56.75 -gcp 1590.408842297174 12184.764313507503 24.926666599999997 56.75 Latvijas_topografiskas_kartes_Jaunkeipene__6828_A1_L30_10_02.JPG Latvijas_topografiskas_kartes_Jaunkeipene__6828_A1_L30_10_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1578.0 2076.0\n11250.0 2022.0\n11337.0 12120.0\n1593.0 12183.0" | \
  gdaltransform -tps -output_xy Latvijas_topografiskas_kartes_Jaunkeipene__6828_A1_L30_10_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_topografiskas_kartes_Jaunkeipene__6828_A1_L30_10_02.vrt Latvijas_topografiskas_kartes_Jaunkeipene__6828_A1_L30_10_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_topografiskas_kartes_Jaunkeipene__6828_A1_L30_10_02.cut.vrt Latvijas_topografiskas_kartes_Jaunkeipene__6828_A1_L30_10_02.xyz