#!/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 699.0 717.0 22.833333333333332 57.333333333333336 -gcp 5379.0 750.0 23.5 57.333333333333336 -gcp 5385.0 5094.0 23.5 57 -gcp 660.0 5052.0 22.833333333333332 57 2_izdevums/15_Mersrags.jpg 15_Mersrags.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "3741.004216444132 276.747084952804\n3741.779515108925 737.2445863409217\n695.6099789177794 707.2562465297057\n660.3731553056923 5055.750416435314\n5818.502108222066 5102.254580788451\n5846.995783555868 286.4891726818434" | \
  gdaltransform -tps -output_xy 15_Mersrags.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  15_Mersrags.vrt 15_Mersrags.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES 15_Mersrags.cut.vrt 15_Mersrags.xyz