Examples with Index2D ucar.ma2.Index2D used on opensource projects

Example 1 with Index2D

use of ucar.ma2.Index2D in project risky by amsa-code.

the class DistanceTravelledCalculator method saveCalculationResultAsNetcdf.

public static void saveCalculationResultAsNetcdf(Options options, CalculationResult calculationResult, String filename) {
    List<CellValue> list = calculationResult.getCells().toList().toBlocking().single();
    int maxLonIndex = list.stream().map(cell -> options.getGrid().cellAt(cell.getCentreLat(), cell.getCentreLon())).filter(// 
    x -> x.isPresent()).map(x -> x.get().getLonIndex()).max(// 
    Comparator.<Long>naturalOrder()).get().intValue();
    int maxLatIndex = list.stream().map(cell -> options.getGrid().cellAt(cell.getCentreLat(), cell.getCentreLon())).filter(x -> x.isPresent()).map(x -> x.get().getLatIndex()).max(Comparator.<Long>naturalOrder()).get().intValue();
    File file = new File(filename);
    // Create the file.
    NetcdfFileWriter f = null;
    try {
        // Create new netcdf-3 file with the given filename
        f = NetcdfFileWriter.createNew(NetcdfFileWriter.Version.netcdf3, file.getPath());
        // In addition to the latitude and longitude dimensions, we will
        // also create latitude and longitude netCDF variables which will
        // hold the actual latitudes and longitudes. Since they hold data
        // about the coordinate system, the netCDF term for these is:
        // "coordinate variables."
        Dimension dimLat = f.addDimension(null, "latitude", maxLatIndex + 1);
        Dimension dimLon = f.addDimension(null, "longitude", maxLonIndex + 1);
        List<Dimension> dims = new ArrayList<Dimension>();
        dims.add(dimLat);
        dims.add(dimLon);
        // coordinate variables
        Variable vLat = f.addVariable(null, "latitude", DataType.DOUBLE, "latitude");
        Variable vLon = f.addVariable(null, "longitude", DataType.DOUBLE, "longitude");
        // value variables
        Variable vDensity = f.addVariable(null, "traffic_density", DataType.DOUBLE, dims);
        // Define units attributes for coordinate vars. This attaches a
        // text attribute to each of the coordinate variables, containing
        // the units.
        vLon.addAttribute(new Attribute("units", "degrees_east"));
        vLat.addAttribute(new Attribute("units", "degrees_north"));
        // Define units attributes for variables.
        vDensity.addAttribute(new Attribute("units", "nm-1"));
        vDensity.addAttribute(new Attribute("long_name", ""));
        // Write the coordinate variable data. This will put the latitudes
        // and longitudes of our data grid into the netCDF file.
        f.create();
        {
            Array dataLat = Array.factory(DataType.DOUBLE, new int[] { dimLat.getLength() });
            Array dataLon = Array.factory(DataType.DOUBLE, new int[] { dimLon.getLength() });
            // set latitudes
            for (int i = 0; i <= maxLatIndex; i++) {
                dataLat.setDouble(i, options.getGrid().centreLat(i));
            }
            // set longitudes
            for (int i = 0; i <= maxLonIndex; i++) {
                dataLon.setDouble(i, options.getGrid().centreLon(i));
            }
            f.write(vLat, dataLat);
            f.write(vLon, dataLon);
        }
        // write the value variable data
        {
            int[] iDim = new int[] { dimLat.getLength(), dimLon.getLength() };
            Array dataDensity = ArrayDouble.D2.factory(DataType.DOUBLE, iDim);
            Index2D idx = new Index2D(iDim);
            for (CellValue point : list) {
                Optional<Cell> cell = options.getGrid().cellAt(point.getCentreLat(), point.getCentreLon());
                if (cell.isPresent()) {
                    idx.set((int) cell.get().getLatIndex(), (int) cell.get().getLonIndex());
                    dataDensity.setDouble(idx, point.getValue());
                }
            }
            f.write(vDensity, dataDensity);
        }
    } catch (IOException | InvalidRangeException e) {
        throw new RuntimeException(e);
    } finally {
        if (f != null) {
            try {
                f.close();
            } catch (IOException ioe) {
                throw new RuntimeException(ioe);
            }
        }
    }
}