#!/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 3003.0 3210.0 27.333333333333332 56.666666666666664 -gcp 17460.0 3297.0 27.5 56.666666666666664 -gcp 17427.0 16752.0 27.5 56.583333333333336 -gcp 2913.0 16647.0 27.333333333333332 56.583333333333336 Latvijas_topografiskas_kartes_Berzgales_pagasta_dala-6828_A1_L12_74_02.JPG Latvijas_topografiskas_kartes_Berzgales_pagasta_dala-6828_A1_L12_74_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"3003.0 3210.0\n17460.0 3297.0\n17427.0 16752.0\n2913.0 16647.0\" | \
  gdaltransform -tps -output_xy Latvijas_topografiskas_kartes_Berzgales_pagasta_dala-6828_A1_L12_74_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Latvijas_topografiskas_kartes_Berzgales_pagasta_dala-6828_A1_L12_74_02.vrt Latvijas_topografiskas_kartes_Berzgales_pagasta_dala-6828_A1_L12_74_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_topografiskas_kartes_Berzgales_pagasta_dala-6828_A1_L12_74_02.cut.vrt Latvijas_topografiskas_kartes_Berzgales_pagasta_dala-6828_A1_L12_74_02.xyz