#!/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 1593.0 2355.215953307393 24.0266666 56.75 -gcp 11307.75 2361.89299610895 24.4766666 56.75 -gcp 11355.0 12486.43023902168 24.4766666 56.5 -gcp 1544.25 12470.414257921067 24.0266666 56.5 Latvijas_topografiskas_kartes_Lieliecavas_apkartne__6828_A1_L30_7_02.JPG Latvijas_topografiskas_kartes_Lieliecavas_apkartne__6828_A1_L30_7_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1596.0 2352.0\n11313.0 2361.0\n11356.5 12486.056698165648\n1543.5 12471.750416898276" | \
  gdaltransform -tps -output_xy Latvijas_topografiskas_kartes_Lieliecavas_apkartne__6828_A1_L30_7_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_topografiskas_kartes_Lieliecavas_apkartne__6828_A1_L30_7_02.vrt Latvijas_topografiskas_kartes_Lieliecavas_apkartne__6828_A1_L30_7_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_topografiskas_kartes_Lieliecavas_apkartne__6828_A1_L30_7_02.cut.vrt Latvijas_topografiskas_kartes_Lieliecavas_apkartne__6828_A1_L30_7_02.xyz