source: josm/trunk/src/com/drew/metadata/exif/GpsDirectory.java@ 11443

Last change on this file since 11443 was 10862, checked in by Don-vip, 9 years ago

update to metadata-extractor 2.9.1
File size: 9.4 KB
Line 
1/*
2 * Copyright 2002-2016 Drew Noakes
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *
16 * More information about this project is available at:
17 *
18 * https://drewnoakes.com/code/exif/
19 * https://github.com/drewnoakes/metadata-extractor
20 */
21package com.drew.metadata.exif;
22
23import com.drew.lang.GeoLocation;
24import com.drew.lang.Rational;
25import com.drew.lang.annotations.NotNull;
26import com.drew.lang.annotations.Nullable;
27
28import java.text.DateFormat;
29import java.text.ParseException;
30import java.text.SimpleDateFormat;
31import java.util.Date;
32import java.util.HashMap;
33import java.util.Locale;
34
35/**
36 * Describes Exif tags that contain Global Positioning System (GPS) data.
37 *
38 * @author Drew Noakes https://drewnoakes.com
39 */
40public class GpsDirectory extends ExifDirectoryBase
41{
42 /** GPS tag version GPSVersionID 0 0 BYTE 4 */
43 public static final int TAG_VERSION_ID = 0x0000;
44 /** North or South Latitude GPSLatitudeRef 1 1 ASCII 2 */
45 public static final int TAG_LATITUDE_REF = 0x0001;
46 /** Latitude GPSLatitude 2 2 RATIONAL 3 */
47 public static final int TAG_LATITUDE = 0x0002;
48 /** East or West Longitude GPSLongitudeRef 3 3 ASCII 2 */
49 public static final int TAG_LONGITUDE_REF = 0x0003;
50 /** Longitude GPSLongitude 4 4 RATIONAL 3 */
51 public static final int TAG_LONGITUDE = 0x0004;
52 /** Altitude reference GPSAltitudeRef 5 5 BYTE 1 */
53 public static final int TAG_ALTITUDE_REF = 0x0005;
54 /** Altitude GPSAltitude 6 6 RATIONAL 1 */
55 public static final int TAG_ALTITUDE = 0x0006;
56 /** GPS time (atomic clock) GPSTimeStamp 7 7 RATIONAL 3 */
57 public static final int TAG_TIME_STAMP = 0x0007;
58 /** GPS satellites used for measurement GPSSatellites 8 8 ASCII Any */
59 public static final int TAG_SATELLITES = 0x0008;
60 /** GPS receiver status GPSStatus 9 9 ASCII 2 */
61 public static final int TAG_STATUS = 0x0009;
62 /** GPS measurement mode GPSMeasureMode 10 A ASCII 2 */
63 public static final int TAG_MEASURE_MODE = 0x000A;
64 /** Measurement precision GPSDOP 11 B RATIONAL 1 */
65 public static final int TAG_DOP = 0x000B;
66 /** Speed unit GPSSpeedRef 12 C ASCII 2 */
67 public static final int TAG_SPEED_REF = 0x000C;
68 /** Speed of GPS receiver GPSSpeed 13 D RATIONAL 1 */
69 public static final int TAG_SPEED = 0x000D;
70 /** Reference for direction of movement GPSTrackRef 14 E ASCII 2 */
71 public static final int TAG_TRACK_REF = 0x000E;
72 /** Direction of movement GPSTrack 15 F RATIONAL 1 */
73 public static final int TAG_TRACK = 0x000F;
74 /** Reference for direction of image GPSImgDirectionRef 16 10 ASCII 2 */
75 public static final int TAG_IMG_DIRECTION_REF = 0x0010;
76 /** Direction of image GPSImgDirection 17 11 RATIONAL 1 */
77 public static final int TAG_IMG_DIRECTION = 0x0011;
78 /** Geodetic survey data used GPSMapDatum 18 12 ASCII Any */
79 public static final int TAG_MAP_DATUM = 0x0012;
80 /** Reference for latitude of destination GPSDestLatitudeRef 19 13 ASCII 2 */
81 public static final int TAG_DEST_LATITUDE_REF = 0x0013;
82 /** Latitude of destination GPSDestLatitude 20 14 RATIONAL 3 */
83 public static final int TAG_DEST_LATITUDE = 0x0014;
84 /** Reference for longitude of destination GPSDestLongitudeRef 21 15 ASCII 2 */
85 public static final int TAG_DEST_LONGITUDE_REF = 0x0015;
86 /** Longitude of destination GPSDestLongitude 22 16 RATIONAL 3 */
87 public static final int TAG_DEST_LONGITUDE = 0x0016;
88 /** Reference for bearing of destination GPSDestBearingRef 23 17 ASCII 2 */
89 public static final int TAG_DEST_BEARING_REF = 0x0017;
90 /** Bearing of destination GPSDestBearing 24 18 RATIONAL 1 */
91 public static final int TAG_DEST_BEARING = 0x0018;
92 /** Reference for distance to destination GPSDestDistanceRef 25 19 ASCII 2 */
93 public static final int TAG_DEST_DISTANCE_REF = 0x0019;
94 /** Distance to destination GPSDestDistance 26 1A RATIONAL 1 */
95 public static final int TAG_DEST_DISTANCE = 0x001A;
96
97 /** Values of "GPS", "CELLID", "WLAN" or "MANUAL" by the EXIF spec. */
98 public static final int TAG_PROCESSING_METHOD = 0x001B;
99 public static final int TAG_AREA_INFORMATION = 0x001C;
100 public static final int TAG_DATE_STAMP = 0x001D;
101 public static final int TAG_DIFFERENTIAL = 0x001E;
102
103 @NotNull
104 protected static final HashMap<Integer, String> _tagNameMap = new HashMap<Integer, String>();
105
106 static
107 {
108 addExifTagNames(_tagNameMap);
109
110 _tagNameMap.put(TAG_VERSION_ID, "GPS Version ID");
111 _tagNameMap.put(TAG_LATITUDE_REF, "GPS Latitude Ref");
112 _tagNameMap.put(TAG_LATITUDE, "GPS Latitude");
113 _tagNameMap.put(TAG_LONGITUDE_REF, "GPS Longitude Ref");
114 _tagNameMap.put(TAG_LONGITUDE, "GPS Longitude");
115 _tagNameMap.put(TAG_ALTITUDE_REF, "GPS Altitude Ref");
116 _tagNameMap.put(TAG_ALTITUDE, "GPS Altitude");
117 _tagNameMap.put(TAG_TIME_STAMP, "GPS Time-Stamp");
118 _tagNameMap.put(TAG_SATELLITES, "GPS Satellites");
119 _tagNameMap.put(TAG_STATUS, "GPS Status");
120 _tagNameMap.put(TAG_MEASURE_MODE, "GPS Measure Mode");
121 _tagNameMap.put(TAG_DOP, "GPS DOP");
122 _tagNameMap.put(TAG_SPEED_REF, "GPS Speed Ref");
123 _tagNameMap.put(TAG_SPEED, "GPS Speed");
124 _tagNameMap.put(TAG_TRACK_REF, "GPS Track Ref");
125 _tagNameMap.put(TAG_TRACK, "GPS Track");
126 _tagNameMap.put(TAG_IMG_DIRECTION_REF, "GPS Img Direction Ref");
127 _tagNameMap.put(TAG_IMG_DIRECTION, "GPS Img Direction");
128 _tagNameMap.put(TAG_MAP_DATUM, "GPS Map Datum");
129 _tagNameMap.put(TAG_DEST_LATITUDE_REF, "GPS Dest Latitude Ref");
130 _tagNameMap.put(TAG_DEST_LATITUDE, "GPS Dest Latitude");
131 _tagNameMap.put(TAG_DEST_LONGITUDE_REF, "GPS Dest Longitude Ref");
132 _tagNameMap.put(TAG_DEST_LONGITUDE, "GPS Dest Longitude");
133 _tagNameMap.put(TAG_DEST_BEARING_REF, "GPS Dest Bearing Ref");
134 _tagNameMap.put(TAG_DEST_BEARING, "GPS Dest Bearing");
135 _tagNameMap.put(TAG_DEST_DISTANCE_REF, "GPS Dest Distance Ref");
136 _tagNameMap.put(TAG_DEST_DISTANCE, "GPS Dest Distance");
137 _tagNameMap.put(TAG_PROCESSING_METHOD, "GPS Processing Method");
138 _tagNameMap.put(TAG_AREA_INFORMATION, "GPS Area Information");
139 _tagNameMap.put(TAG_DATE_STAMP, "GPS Date Stamp");
140 _tagNameMap.put(TAG_DIFFERENTIAL, "GPS Differential");
141 }
142
143 public GpsDirectory()
144 {
145 this.setDescriptor(new GpsDescriptor(this));
146 }
147
148 @Override
149 @NotNull
150 public String getName()
151 {
152 return "GPS";
153 }
154
155 @Override
156 @NotNull
157 protected HashMap<Integer, String> getTagNameMap()
158 {
159 return _tagNameMap;
160 }
161
162 /**
163 * Parses various tags in an attempt to obtain a single object representing the latitude and longitude
164 * at which this image was captured.
165 *
166 * @return The geographical location of this image, if possible, otherwise null
167 */
168 @Nullable
169 public GeoLocation getGeoLocation()
170 {
171 Rational[] latitudes = getRationalArray(TAG_LATITUDE);
172 Rational[] longitudes = getRationalArray(TAG_LONGITUDE);
173 String latitudeRef = getString(TAG_LATITUDE_REF);
174 String longitudeRef = getString(TAG_LONGITUDE_REF);
175
176 // Make sure we have the required values
177 if (latitudes == null || latitudes.length != 3)
178 return null;
179 if (longitudes == null || longitudes.length != 3)
180 return null;
181 if (latitudeRef == null || longitudeRef == null)
182 return null;
183
184 Double lat = GeoLocation.degreesMinutesSecondsToDecimal(latitudes[0], latitudes[1], latitudes[2], latitudeRef.equalsIgnoreCase("S"));
185 Double lon = GeoLocation.degreesMinutesSecondsToDecimal(longitudes[0], longitudes[1], longitudes[2], longitudeRef.equalsIgnoreCase("W"));
186
187 // This can return null, in cases where the conversion was not possible
188 if (lat == null || lon == null)
189 return null;
190
191 return new GeoLocation(lat, lon);
192 }
193
194 /**
195 * Parses the date stamp tag and the time stamp tag to obtain a single Date object representing the
196 * date and time when this image was captured.
197 *
198 * @return A Date object representing when this image was captured, if possible, otherwise null
199 */
200 @Nullable
201 public Date getGpsDate()
202 {
203 String date = getString(TAG_DATE_STAMP);
204 Rational[] timeComponents = getRationalArray(TAG_TIME_STAMP);
205
206 // Make sure we have the required values
207 if (date == null)
208 return null;
209 if (timeComponents == null || timeComponents.length != 3)
210 return null;
211
212 String dateTime = String.format(Locale.US, "%s %02d:%02d:%02.3f UTC",
213 date, timeComponents[0].intValue(), timeComponents[1].intValue(), timeComponents[2].doubleValue());
214 try {
215 DateFormat parser = new SimpleDateFormat("yyyy:MM:dd HH:mm:ss.S z");
216 return parser.parse(dateTime);
217 } catch (ParseException e) {
218 return null;
219 }
220 }
221}
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