/*
* Copyright 1998-2016 University Corporation for Atmospheric Research/Unidata
*
* Portions of this software were developed by the Unidata Program at the
* University Corporation for Atmospheric Research.
*
* Access and use of this software shall impose the following obligations
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* any fee or cost, to use, copy, modify, alter, enhance and distribute
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package ucar.nc2.grib.grib2;
import org.junit.Assert;
import org.junit.Test;
import ucar.nc2.Dimension;
import ucar.nc2.NetcdfFile;
import ucar.nc2.Variable;
import ucar.unidata.geoloc.projection.RotatedPole;
/**
* Test reading GRIB2 files with {@link RotatedPole} projections.
*
* @author Ben Caradoc-Davies (Transient Software Limited)
*/
public class TestRotatedPole {
/**
* Tolerance for floating point comparisons.
*/
public static final double DELTA = 1e-6;
/**
* Test reading an RAP native GRIB2 file with a GDS template 32769
* {@link RotatedPole} projection.
*/
@Test
public void testRapNative() throws Exception {
try (NetcdfFile nc = NetcdfFile.open("../grib/src/test/data/rap-native.grib2")) {
Assert.assertNotNull(nc);
// check dimensions
Dimension rlonDim = nc.findDimension("rlon");
Assert.assertNotNull(rlonDim);
Assert.assertEquals(7, rlonDim.getLength());
Dimension rlatDim = nc.findDimension("rlat");
Assert.assertNotNull(rlatDim);
Assert.assertEquals(5, rlatDim.getLength());
Dimension timeDim = nc.findDimension("time");
Assert.assertNotNull(timeDim);
Assert.assertEquals(1, timeDim.getLength());
// check coordinate variables
Variable rlonVar = nc.findVariable("rlon");
Assert.assertNotNull(rlonVar);
Assert.assertEquals(1, rlonVar.getDimensions().size());
Assert.assertEquals(rlonDim, rlonVar.getDimensions().get(0));
Assert.assertEquals("grid_longitude", rlonVar.findAttribute("standard_name").getStringValue());
Assert.assertEquals("degrees", rlonVar.findAttribute("units").getStringValue());
Assert.assertArrayEquals(new float[] { -30, -20, -10, 0, 10, 20, 30 },
(float[]) rlonVar.read().copyTo1DJavaArray(), (float) DELTA);
Variable rlatVar = nc.findVariable("rlat");
Assert.assertNotNull(rlatVar);
Assert.assertEquals(1, rlatVar.getDimensions().size());
Assert.assertEquals(rlatDim, rlatVar.getDimensions().get(0));
Assert.assertEquals("grid_latitude", rlatVar.findAttribute("standard_name").getStringValue());
Assert.assertEquals("degrees", rlatVar.findAttribute("units").getStringValue());
Assert.assertArrayEquals(new float[] { -20, -10, 0, 10, 20 }, (float[]) rlatVar.read().copyTo1DJavaArray(),
(float) DELTA);
Variable timeVar = nc.findVariable("time");
Assert.assertNotNull(timeVar);
Assert.assertEquals(1, timeVar.getDimensions().size());
Assert.assertEquals(timeDim, timeVar.getDimensions().get(0));
Assert.assertEquals("time", timeVar.findAttribute("standard_name").getStringValue());
Assert.assertEquals("Hour since 2016-04-25T22:00:00Z", timeVar.findAttribute("units").getStringValue());
Assert.assertArrayEquals(new double[] { 0 }, (double[]) timeVar.read().copyTo1DJavaArray(), DELTA);
// check projection variable
Variable projVar = nc.findVariable("RotatedLatLon32769_Projection");
Assert.assertNotNull(projVar);
Assert.assertEquals("rotated_latitude_longitude", projVar.findAttribute("grid_mapping_name").getStringValue());
Assert.assertEquals(74.0, projVar.findAttribute("grid_north_pole_longitude").getNumericValue().doubleValue(),
DELTA);
Assert.assertEquals(36.0, projVar.findAttribute("grid_north_pole_latitude").getNumericValue().doubleValue(),
DELTA);
// check data variable
Variable dataVar = nc.findVariable("Temperature_surface");
Assert.assertNotNull(dataVar);
Assert.assertEquals("RotatedLatLon32769_Projection", dataVar.findAttribute("grid_mapping").getStringValue());
Assert.assertEquals("K", dataVar.findAttribute("units").getStringValue());
Assert.assertEquals(3, dataVar.getDimensions().size());
Assert.assertEquals(timeDim, dataVar.getDimensions().get(0));
Assert.assertEquals(rlatDim, dataVar.getDimensions().get(1));
Assert.assertEquals(rlonDim, dataVar.getDimensions().get(2));
Assert.assertArrayEquals(
new float[] { 300, 299, 298, 297, 296, 295, 294, 299, 300, 299, 298, 297, 296, 295, 298, 299, 300, 299, 298,
297, 296, 297, 298, 299, 300, 299, 298, 297, 296, 297, 298, 299, 300, 299, 298 },
(float[]) dataVar.read().copyTo1DJavaArray(), (float) DELTA);
}
}
/**
* Test reading a COSMO EU GRIB2 file with a GDS template 1
* {@link RotatedPole} projection.
*/
@Test
public void testCosmoEu() throws Exception {
try (NetcdfFile nc = NetcdfFile.open("../grib/src/test/data/cosmo-eu.grib2")) {
Assert.assertNotNull(nc);
// check dimensions
Dimension rlonDim = nc.findDimension("rlon");
Assert.assertNotNull(rlonDim);
Assert.assertEquals(5, rlonDim.getLength());
Dimension rlatDim = nc.findDimension("rlat");
Assert.assertNotNull(rlatDim);
Assert.assertEquals(5, rlatDim.getLength());
Dimension timeDim = nc.findDimension("time");
Assert.assertNotNull(timeDim);
Assert.assertEquals(1, timeDim.getLength());
// check coordinate variables
Variable rlonVar = nc.findVariable("rlon");
Assert.assertNotNull(rlonVar);
Assert.assertEquals(1, rlonVar.getDimensions().size());
Assert.assertEquals(rlonDim, rlonVar.getDimensions().get(0));
Assert.assertEquals("grid_longitude", rlonVar.findAttribute("standard_name").getStringValue());
Assert.assertEquals("degrees", rlonVar.findAttribute("units").getStringValue());
Assert.assertArrayEquals(new float[] { -18, -8, 2, 12, 22 }, (float[]) rlonVar.read().copyTo1DJavaArray(),
(float) DELTA);
Variable rlatVar = nc.findVariable("rlat");
Assert.assertNotNull(rlatVar);
Assert.assertEquals(1, rlatVar.getDimensions().size());
Assert.assertEquals(rlatDim, rlatVar.getDimensions().get(0));
Assert.assertEquals("grid_latitude", rlatVar.findAttribute("standard_name").getStringValue());
Assert.assertEquals("degrees", rlatVar.findAttribute("units").getStringValue());
Assert.assertArrayEquals(new float[] { -20, -10, 0, 10, 20 }, (float[]) rlatVar.read().copyTo1DJavaArray(),
(float) DELTA);
Variable timeVar = nc.findVariable("time");
Assert.assertNotNull(timeVar);
Assert.assertEquals(1, timeVar.getDimensions().size());
Assert.assertEquals(timeDim, timeVar.getDimensions().get(0));
Assert.assertEquals("time", timeVar.findAttribute("standard_name").getStringValue());
Assert.assertEquals("Hour since 2010-03-29T00:00:00Z", timeVar.findAttribute("units").getStringValue());
Assert.assertArrayEquals(new double[] { 0 }, (double[]) timeVar.read().copyTo1DJavaArray(), DELTA);
// check projection variable
Variable projVar = nc.findVariable("RotatedLatLon_Projection");
Assert.assertNotNull(projVar);
Assert.assertEquals("rotated_latitude_longitude", projVar.findAttribute("grid_mapping_name").getStringValue());
Assert.assertEquals(-170.0, projVar.findAttribute("grid_north_pole_longitude").getNumericValue().doubleValue(),
DELTA);
Assert.assertEquals(40.0, projVar.findAttribute("grid_north_pole_latitude").getNumericValue().doubleValue(),
DELTA);
// check data variable
Variable dataVar = nc.findVariable("Snow_depth_water_equivalent_surface");
Assert.assertNotNull(dataVar);
Assert.assertEquals("RotatedLatLon_Projection", dataVar.findAttribute("grid_mapping").getStringValue());
Assert.assertEquals("kg.m-2", dataVar.findAttribute("units").getStringValue());
Assert.assertEquals(3, dataVar.getDimensions().size());
Assert.assertEquals(timeDim, dataVar.getDimensions().get(0));
Assert.assertEquals(rlatDim, dataVar.getDimensions().get(1));
Assert.assertEquals(rlonDim, dataVar.getDimensions().get(2));
Assert.assertArrayEquals(new float[] { 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114,
115, 116, 117, 118, 119, 120, 121, 122, 123, 124 }, (float[]) dataVar.read().copyTo1DJavaArray(),
(float) DELTA);
}
}
}