#!/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 1663.5 2410.72679266259 23.1266666 57 -gcp 11371.5 2449.7084491384103 23.5766666 57 -gcp 11393.25 12579.202195664258 23.5766666 56.75 -gcp 1618.5 12568.91939966648 23.1266666 56.75 Latvijas_topografiskas_kartes_Tukuma_apkartne__6828_A1_L30_1_02.JPG Latvijas_topografiskas_kartes_Tukuma_apkartne__6828_A1_L30_1_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1662.375 2408.984783212896\n11370.0 2449.532518065592\n11393.25 12580.519177320733\n1615.5 12568.507504168983" | \
  gdaltransform -tps -output_xy Latvijas_topografiskas_kartes_Tukuma_apkartne__6828_A1_L30_1_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_topografiskas_kartes_Tukuma_apkartne__6828_A1_L30_1_02.vrt Latvijas_topografiskas_kartes_Tukuma_apkartne__6828_A1_L30_1_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_topografiskas_kartes_Tukuma_apkartne__6828_A1_L30_1_02.cut.vrt Latvijas_topografiskas_kartes_Tukuma_apkartne__6828_A1_L30_1_02.xyz