#!/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 2343.0 35030.12451361868 27.333333333333332 56 -gcp 2192.25 12675.849221789882 28.333333333333332 56 -gcp 11994.75 12501.150500277932 28.333333333333332 55.75 -gcp 12130.5 35088.48235130628 27.333333333333332 55.75 Latvijas_un_Lietuvas_topografiskas_kartes__Druja_un_apkartne__6828_A1_L32_8_02.JPG Latvijas_un_Lietuvas_topografiskas_kartes__Druja_un_apkartne__6828_A1_L32_8_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "7093.5 12575.993337034979\n2189.25 12675.695446973903\n2337.0 23711.89339255969\n2343.0 35031.0\n7236.0 35059.5\n12129.0 35088.0\n12132.0 23714.955857856745\n12000.0 12501.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Lietuvas_topografiskas_kartes__Druja_un_apkartne__6828_A1_L32_8_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Lietuvas_topografiskas_kartes__Druja_un_apkartne__6828_A1_L32_8_02.vrt Latvijas_un_Lietuvas_topografiskas_kartes__Druja_un_apkartne__6828_A1_L32_8_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_un_Lietuvas_topografiskas_kartes__Druja_un_apkartne__6828_A1_L32_8_02.cut.vrt Latvijas_un_Lietuvas_topografiskas_kartes__Druja_un_apkartne__6828_A1_L32_8_02.xyz