#!/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 1268.4920237010028 1679.4204374057315 24.0266666 57.25 -gcp 10829.085232452142 1732.6975867269985 24.4766666 57.25 -gcp 10830.6289881495 11868.420060331826 24.4766666 57 -gcp 1207.6921148587055 11817.985671191555 24.0266666 57 Latvijas_topografiskas_kartes_Carnikavas_apkartne__6828_A1_L30_12_02.JPG Latvijas_topografiskas_kartes_Carnikavas_apkartne__6828_A1_L30_12_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1268.6167958067456 1677.7760180995474\n10825.590246125797 1730.9773755656108\n10832.723792160437 11869.49472096531\n1205.9842752962625 11816.980015082956" | \
  gdaltransform -tps -output_xy Latvijas_topografiskas_kartes_Carnikavas_apkartne__6828_A1_L30_12_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_topografiskas_kartes_Carnikavas_apkartne__6828_A1_L30_12_02.vrt Latvijas_topografiskas_kartes_Carnikavas_apkartne__6828_A1_L30_12_02.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES Latvijas_topografiskas_kartes_Carnikavas_apkartne__6828_A1_L30_12_02.cut.vrt Latvijas_topografiskas_kartes_Carnikavas_apkartne__6828_A1_L30_12_02.xyz