| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.sis.measure; |
| |
| import org.opengis.referencing.cs.AxisDirection; // For javadoc |
| |
| |
| /** |
| * The angular height of an object measured from the horizontal plane. |
| * The elevation angle is part of <cite>local topocentric coordinates</cite> together with azimuth and distance. |
| * For visible objects the elevation is an angle between 0° and 90°. |
| * |
| * <div class="note"><b>Note:</b> |
| * <cite>Elevation angle</cite> and <cite>altitude angle</cite> may be used interchangeably. |
| * Both <cite>altitude</cite> and <cite>elevation</cite> words are also used to describe the |
| * height in meters above sea level.</div> |
| * |
| * <h2>Immutability and thread safety</h2> |
| * This final class is immutable and thus inherently thread-safe. |
| * |
| * @author Martin Desruisseaux (Geomatys) |
| * @version 0.4 |
| * |
| * @see org.apache.sis.referencing.cs.CoordinateSystems#angle(AxisDirection, AxisDirection) |
| * |
| * @since 0.4 |
| * @module |
| */ |
| public final class ElevationAngle extends Angle { |
| /** |
| * Serial number for inter-operability with different versions. |
| */ |
| private static final long serialVersionUID = 442355803542468396L; |
| |
| /** |
| * An elevation angle of 90° for an imaginary point directly above a location. |
| * This is the opposite of {@link #NADIR} direction. |
| */ |
| public static final ElevationAngle ZENITH = new ElevationAngle(90); |
| |
| /** |
| * An elevation angle of -90° for an imaginary point directly below a location. |
| * This is the opposite of {@link #ZENITH} direction. |
| */ |
| public static final ElevationAngle NADIR = new ElevationAngle(-90); |
| |
| /** |
| * Constructs a new elevation angle with the specified angular value. |
| * |
| * @param ε elevation angle value in decimal degrees. |
| */ |
| public ElevationAngle(final double ε) { |
| super(ε); |
| } |
| |
| /** |
| * Constructs a newly allocated {@code ElevationAngle} object that contain the angular value |
| * represented by the string. The string should represent an angle in either fractional degrees |
| * (e.g. 45.5°) or degrees with minutes and seconds (e.g. 45°30'). |
| * |
| * @param string a string to be converted to an {@code ElevationAngle}. |
| * @throws NumberFormatException if the string does not contain a parsable angle, |
| * or represents an elevation angle. |
| */ |
| public ElevationAngle(final String string) throws NumberFormatException { |
| super(string); |
| } |
| } |