#!/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 12877.0184415966 33851.15229643384 24.0266666 57.25 -gcp 3039.0 4200.366870483602 25.3766666 57.5 -gcp 22814.25 3981.877570872707 25.3766666 57 -gcp 22748.25 34009.81142301278 24.0266666 57 Latvijas_un_Igaunijas_topografiskas_kartes_Limbazi-Cesis_6828_A1_L36_16_02.JPG Latvijas_un_Igaunijas_topografiskas_kartes_Limbazi-Cesis_6828_A1_L36_16_02.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2316.75 4204.497501388118\n2314.5 18952.505830094393\n2382.0 33681.0\n22749.0 34008.0\n22854.0 19017.011660188782\n22815.0 3981.0" | \
  gdaltransform -tps -output_xy Latvijas_un_Igaunijas_topografiskas_kartes_Limbazi-Cesis_6828_A1_L36_16_02.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  Latvijas_un_Igaunijas_topografiskas_kartes_Limbazi-Cesis_6828_A1_L36_16_02.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Limbazi-Cesis_6828_A1_L36_16_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_Limbazi-Cesis_6828_A1_L36_16_02.cut.vrt Latvijas_un_Igaunijas_topografiskas_kartes_Limbazi-Cesis_6828_A1_L36_16_02.xyz