#!/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 2787.0 2521.7609783212897 23.1266666 59.416666666666664 -gcp 21028.5 2620.6692607003893 24.0266666 59.416666666666664 -gcp 21059.1659126863 19482.65279266413 24.0266666 59 -gcp 2836.5 19345.935241801 23.1266666 59 Latvijas_un_Igaunijas_topografiskas_kartes_Odensholma_6828_A1_L36_1_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Odensholma_6828_A1_L36_1_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "11919.0 2622.0283176013327\n2787.0 2520.0\n2806.5 10932.000832870628\n2832.75 19341.795391449195\n11958.0 19464.029150471957\n21058.5 19481.262909494726\n21060.75 11052.751457523598\n21030.0 2619.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Odensholma_6828_A1_L36_1_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Odensholma_6828_A1_L36_1_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Odensholma_6828_A1_L36_1_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_un_Igaunijas_topografiskas_kartes_Odensholma_6828_A1_L36_1_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Odensholma_6828_A1_L36_1_02.xyz