#!/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 1562.25 3053.465119510839 24.0266666 57 -gcp 11250.0 3097.69927737632 24.4766666 57 -gcp 11290.5 13192.742217898834 24.4766666 56.75 -gcp 1542.4616526593684 13180.74952758558 24.0266666 56.75 Latvijas_topografiskas_kartes_Rigas_apkartne__6828_A1_L30_9_02.JPG Latvijas_topografiskas_kartes_Rigas_apkartne__6828_A1_L30_9_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1561.5 3052.4974986103393\n11250.0 3099.0\n11292.0 13191.0\n1539.0 13179.0" | \
  gdaltransform -tps -output_xy Latvijas_topografiskas_kartes_Rigas_apkartne__6828_A1_L30_9_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_topografiskas_kartes_Rigas_apkartne__6828_A1_L30_9_02.vrt Latvijas_topografiskas_kartes_Rigas_apkartne__6828_A1_L30_9_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_topografiskas_kartes_Rigas_apkartne__6828_A1_L30_9_02.cut.vrt Latvijas_topografiskas_kartes_Rigas_apkartne__6828_A1_L30_9_02.xyz