#!/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 1806.0 1827.0 26 56.666666666666664 -gcp 23424.0 1935.0 28 56.666666666666664 -gcp 23601.0 15456.0 28 56 -gcp 1596.0 15288.0 26 56 lvva/Latvijas_topografiskas_kartes_Rezekne_6828_A1_L44_3_02.JPG Latvijas_topografiskas_kartes_Rezekne_6828_A1_L44_3_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1806.0 1827.0\n12649.5 1950.0383546414673\n23424.0 1935.0\n23601.0 15456.0\n12619.5 15462.050027793219\n1596.0 15288.0" | \
  gdaltransform -tps -output_xy Latvijas_topografiskas_kartes_Rezekne_6828_A1_L44_3_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_topografiskas_kartes_Rezekne_6828_A1_L44_3_02.vrt Latvijas_topografiskas_kartes_Rezekne_6828_A1_L44_3_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_topografiskas_kartes_Rezekne_6828_A1_L44_3_02.cut.vrt Latvijas_topografiskas_kartes_Rezekne_6828_A1_L44_3_02.xyz