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https://codeberg.org/OpenTracksApp/OpenTracks.git
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EGM2008: added undulation data and bilinear computation.
Includes data structure for caching. Part of #224.
This commit is contained in:
Dennis Guse
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package de.dennisguse.opentracks.util;
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import android.content.Context;
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import androidx.test.core.app.ApplicationProvider;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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import org.junit.runners.JUnit4;
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import java.io.DataInputStream;
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import java.io.EOFException;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.nio.charset.StandardCharsets;
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import java.time.Instant;
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import de.dennisguse.opentracks.content.data.TrackPoint;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertNotEquals;
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@RunWith(JUnit4.class)
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public class EGM2008UtilsTest {
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private static final double MAX_BILINEAR_ERROR = 0.478;
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private final Context context = ApplicationProvider.getApplicationContext();
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@Test
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public void fileVerification() throws IOException {
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// given
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int expectedLength = 18671444;
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int expectedHeaderLength = 404;
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String expectedHeader = "P5\n" +
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"# Geoid file in PGM format for the GeographicLib::Geoid class\n" +
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"# Description WGS84 EGM2008, 5-minute grid\n" +
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"# URL http://earth-info.nga.mil/GandG/wgs84/gravitymod/egm2008\n" +
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"# DateTime 2009-08-29 18:45:00\n" +
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"# MaxBilinearError 0.478\n" +
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"# RMSBilinearError 0.012\n" +
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"# MaxCubicError 0.294\n" +
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"# RMSCubicError 0.005\n" +
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"# Offset -108\n" +
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"# Scale 0.003\n" +
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"# Origin 90N 0E\n" +
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"# AREA_OR_POINT Point\n" +
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"# Vertical_Datum WGS84\n" +
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"4320 2161\n" +
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"65535" +
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"\n";
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// when
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try (InputStream inputStream = context.getResources().openRawResource(EGM2008Utils.EGM2008_5_DATA)) {
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assertEquals(expectedLength, inputStream.available());
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InputStreamReader reader = new InputStreamReader(inputStream, StandardCharsets.US_ASCII);
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char[] data = new char[expectedHeaderLength];
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int length = reader.read(data);
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// then
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assertEquals(expectedHeaderLength, length);
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assertEquals(expectedHeader, new String(data));
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}
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}
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@Test
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public void data_Northpole() throws IOException {
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// given
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TrackPoint trackPoint = new TrackPoint(TrackPoint.Type.TRACKPOINT, Instant.ofEpochMilli(0));
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trackPoint.setLatitude(90);
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trackPoint.setLongitude(0.1);
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trackPoint.setAltitude(0);
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// when
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EGM2008Utils.EGM2008Correction altitude_egm2008 = EGM2008Utils.createEGM2008Correction(context, trackPoint.getLocation());
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// then
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assertEquals(-14.8980, altitude_egm2008.correctAltitude(trackPoint.getLocation()), MAX_BILINEAR_ERROR);
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}
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@Test
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public void data_Southpole() throws IOException {
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// given
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TrackPoint trackPoint = new TrackPoint(TrackPoint.Type.TRACKPOINT, Instant.ofEpochMilli(0));
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trackPoint.setLatitude(-90);
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trackPoint.setLongitude(0);
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trackPoint.setAltitude(0);
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// when
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EGM2008Utils.EGM2008Correction altitude_egm2008 = EGM2008Utils.createEGM2008Correction(context, trackPoint.getLocation());
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// then
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assertEquals(30.15, altitude_egm2008.correctAltitude(trackPoint.getLocation()), MAX_BILINEAR_ERROR);
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}
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@Test
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public void data_Southpole2() throws IOException {
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// given
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TrackPoint trackPoint = new TrackPoint(TrackPoint.Type.TRACKPOINT, Instant.ofEpochMilli(0));
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trackPoint.setLatitude(-90);
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trackPoint.setLongitude(180);
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trackPoint.setAltitude(0);
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// when
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EGM2008Utils.EGM2008Correction altitude_egm2008 = EGM2008Utils.createEGM2008Correction(context, trackPoint.getLocation());
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// then
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assertEquals(30.15, altitude_egm2008.correctAltitude(trackPoint.getLocation()), MAX_BILINEAR_ERROR);
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}
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@Test
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public void data_Southpole3() throws IOException {
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// given
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TrackPoint trackPoint = new TrackPoint(TrackPoint.Type.TRACKPOINT, Instant.ofEpochMilli(0));
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trackPoint.setLatitude(-90);
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trackPoint.setLongitude(-180);
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trackPoint.setAltitude(0);
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// when
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EGM2008Utils.EGM2008Correction altitude_egm2008 = EGM2008Utils.createEGM2008Correction(context, trackPoint.getLocation());
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// then
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assertEquals(30.15, altitude_egm2008.correctAltitude(trackPoint.getLocation()), MAX_BILINEAR_ERROR);
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}
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@Test
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public void data_0() throws IOException {
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// given
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TrackPoint trackPoint = new TrackPoint(TrackPoint.Type.TRACKPOINT, Instant.ofEpochMilli(0));
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trackPoint.setLatitude(0);
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trackPoint.setLongitude(0);
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trackPoint.setAltitude(0);
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// when
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EGM2008Utils.EGM2008Correction altitude_egm2008 = EGM2008Utils.createEGM2008Correction(context, trackPoint.getLocation());
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// then
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assertEquals(-17.2260, altitude_egm2008.correctAltitude(trackPoint.getLocation()), MAX_BILINEAR_ERROR);
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}
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@Test
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public void data_Berlin() throws IOException {
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// given
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TrackPoint trackPoint = new TrackPoint(TrackPoint.Type.TRACKPOINT, Instant.ofEpochMilli(0));
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trackPoint.setLatitude(52.530644);
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trackPoint.setLongitude(13.383068);
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trackPoint.setAltitude(0);
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// when
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EGM2008Utils.EGM2008Correction altitude_egm2008 = EGM2008Utils.createEGM2008Correction(context, trackPoint.getLocation());
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// then
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assertEquals(-39.4865, altitude_egm2008.correctAltitude(trackPoint.getLocation()), MAX_BILINEAR_ERROR);
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}
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@Test
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public void data_Berlin_Caching() throws IOException {
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// given
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TrackPoint trackPoint1 = new TrackPoint(TrackPoint.Type.TRACKPOINT, Instant.ofEpochMilli(0));
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trackPoint1.setLatitude(52.530644);
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trackPoint1.setLongitude(13.383068);
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trackPoint1.setAltitude(0);
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TrackPoint trackPoint2 = new TrackPoint(TrackPoint.Type.TRACKPOINT, Instant.ofEpochMilli(0));
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trackPoint2.setLatitude(52.530000);
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trackPoint2.setLongitude(13.380000);
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trackPoint2.setAltitude(0);
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// when
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EGM2008Utils.EGM2008Correction altitude_egm2008 = EGM2008Utils.createEGM2008Correction(context, trackPoint1.getLocation());
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// then
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assertNotEquals(altitude_egm2008.correctAltitude(trackPoint1.getLocation()), altitude_egm2008.correctAltitude(trackPoint2.getLocation()), 0.0001);
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}
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@Test
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public void data_MaxUndulation() throws IOException {
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// given
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TrackPoint trackPoint = new TrackPoint(TrackPoint.Type.TRACKPOINT, Instant.ofEpochMilli(0));
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trackPoint.setLatitude(-8.417);
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trackPoint.setLongitude(147.367);
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trackPoint.setAltitude(0);
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// when
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EGM2008Utils.EGM2008Correction altitude_egm2008 = EGM2008Utils.createEGM2008Correction(context, trackPoint.getLocation());
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// then
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assertEquals(-85.824, altitude_egm2008.correctAltitude(trackPoint.getLocation()), MAX_BILINEAR_ERROR);
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}
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@Test
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public void getIndices() {
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TrackPoint trackPoint = new TrackPoint(TrackPoint.Type.TRACKPOINT, Instant.ofEpochMilli(0));
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trackPoint.setLatitude(90);
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trackPoint.setLongitude(0);
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assertEquals(new EGM2008Utils.Indices(0, 0), EGM2008Utils.getIndices(trackPoint.getLocation()));
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trackPoint.setLatitude(0);
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trackPoint.setLongitude(0);
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assertEquals(new EGM2008Utils.Indices(1080, 0), EGM2008Utils.getIndices(trackPoint.getLocation()));
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trackPoint.setLatitude(-90);
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trackPoint.setLongitude(180);
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assertEquals(new EGM2008Utils.Indices(2160, 4320 / 2), EGM2008Utils.getIndices(trackPoint.getLocation()));
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trackPoint.setLatitude(-90);
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trackPoint.setLongitude(-180);
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assertEquals(new EGM2008Utils.Indices(2160, 0), EGM2008Utils.getIndices(trackPoint.getLocation()));
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}
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@Test
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public void getUndulationRaw_ok() throws IOException {
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try (DataInputStream dataInputStream = new DataInputStream(context.getResources().openRawResource(EGM2008Utils.EGM2008_5_DATA))) {
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assertEquals(40966, EGM2008Utils.getUndulationRaw(dataInputStream, new EGM2008Utils.Indices(0, 0)));
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assertEquals(41742, EGM2008Utils.getUndulationRaw(dataInputStream, new EGM2008Utils.Indices(1081, 0)));
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assertEquals(25950, EGM2008Utils.getUndulationRaw(dataInputStream, new EGM2008Utils.Indices(2160, 4319)));
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}
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}
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@Test(expected = EOFException.class)
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public void getUndulationRaw_error() throws IOException {
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try (DataInputStream dataInputStream = new DataInputStream(context.getResources().openRawResource(EGM2008Utils.EGM2008_5_DATA))) {
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assertEquals(0, EGM2008Utils.getUndulationRaw(dataInputStream, new EGM2008Utils.Indices(2161, 4320)), 0.01);
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}
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}
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}
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