#!/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 3084.0 3174.0 25.833333333333332 56 -gcp 17778.0 3285.0 26 56 -gcp 17745.0 16761.0 26 55.916666666666664 -gcp 3015.0 16656.0 25.833333333333332 55.916666666666664 Latvijas_topografiskas_kartes_Prodes_pagasta_un_Subates-6828_A1_L12_21_02.JPG Latvijas_topografiskas_kartes_Prodes_pagasta_un_Subates-6828_A1_L12_21_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e \"3084.0 3174.0\n17778.0 3285.0\n17745.0 16761.0\n3015.0 16656.0\" | \
  gdaltransform -tps -output_xy Latvijas_topografiskas_kartes_Prodes_pagasta_un_Subates-6828_A1_L12_21_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}'))))" \
  Latvijas_topografiskas_kartes_Prodes_pagasta_un_Subates-6828_A1_L12_21_02.vrt Latvijas_topografiskas_kartes_Prodes_pagasta_un_Subates-6828_A1_L12_21_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_topografiskas_kartes_Prodes_pagasta_un_Subates-6828_A1_L12_21_02.cut.vrt Latvijas_topografiskas_kartes_Prodes_pagasta_un_Subates-6828_A1_L12_21_02.xyz