Module: NSWTopo::Import

Includes:
Raster
Defined in:
lib/nswtopo/layer/import.rb

Instance Method Summary collapse

Methods included from Raster

#create, #empty?, #filename, #render, #size_resolution, #to_s

Instance Method Details

#get_raster(temp_dir) ⇒ Object 



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# File 'lib/nswtopo/layer/import.rb', line 5

def get_raster(temp_dir)
  crop_path = temp_dir / "crop.tif"

  json = begin
    OS.gdalinfo "-json", @path
  rescue OS::Error
    raise "invalid raster file: #{@path}"
  end
  palette = JSON.parse(json)["bands"].any? do |band|
    "Palette" == band["colorInterpretation"]
  end

  projection = Projection.new(@path)
  args = ["-projwin", *@map.projwin(projection), @path, crop_path]
  args = ["-expand", "rgba", *args] if palette
  OS.gdal_translate *args

  return Numeric === @resolution ? @resolution : @map.get_raster_resolution(crop_path), crop_path
end