java中jpeg的地理定位
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【中文标题】java中jpeg的地理定位【英文标题】：Geolocation from jpeg in java 【发布时间】：2012-07-11 07:25:39 【问题描述】：我的朋友正在使用 Struts (Java)，我们正在尝试查找 JPEG 图片的 GeoLocation。
我不知道在哪里阅读或如何实现它的 java 代码。
我想获得一张 jpeg 格式的图片，并将其显示在网站上的谷歌地图上。
你如何将这些信息从 Exif 标签传递到谷歌地图，以便我可以在地图上看到位置
【问题讨论】：
地理位置位于 EXIF 标签中。尝试自己获取它，google 给了我很多如何从 JPEG 中提取 EXIF 信息的结果。如果您有更具体的问题，请再次提问或完善您的问题。 【参考方案1】：geolocation 部分与 Struts 无关。 Struts 只涉及数据的呈现。
图像的地理位置有时存储在 JPEG 文件的元数据中。您可以使用 this one 之类的库从 JPEG 图像中提取元数据。
请注意，许多相机不存储地理位置数据。
【讨论】：
哦，他们没有，那我的教授在说什么。我的教授要求我们做一个项目，现在我们遇到了一些我们还不知道的事情，让我读一下你的图书馆页面，看看这对我来说是否有意义谢谢 你如何将这些信息从 Exif 标签传递到谷歌地图你知道吗？ 你需要自己研究一下。如果您到处寻找，但仍然卡住，您可以在此处打开另一个问题。【参考方案2】：您的问题分为两部分
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从 Jpeg 图像中提取 gps 信息
如何将提取的信息提供给谷歌地图。
这里详细讨论第一部分
阅读图像元现在通过apache commons-imaging library 得到了极大的简化和精简
/**
* Reference : https://github.com/apache/commons-imaging/blob/master/src/test/java/org/apache/commons/imaging/examples/MetadataExample.java
*/
public static void readImageMeta(final File imgFile) throws ImageReadException, IOException
/** get all metadata stored in EXIF format (ie. from JPEG or TIFF). **/
final ImageMetadata metadata = Imaging.getMetadata(imgFile);
System.out.println(metadata);
System.out.println("--------------------------------------------------------------------------------");
/** Get specific meta data information by drilling down the meta **/
if (metadata instanceof JpegImageMetadata)
JpegImageMetadata jpegMetadata = (JpegImageMetadata) metadata;
printTagValue(jpegMetadata, GpsTagConstants.GPS_TAG_GPS_LATITUDE_REF);
printTagValue(jpegMetadata, GpsTagConstants.GPS_TAG_GPS_LATITUDE);
printTagValue(jpegMetadata, GpsTagConstants.GPS_TAG_GPS_LONGITUDE_REF);
printTagValue(jpegMetadata, GpsTagConstants.GPS_TAG_GPS_LONGITUDE);
// simple interface to GPS data
final TiffImageMetadata exifMetadata = jpegMetadata.getExif();
if (null != exifMetadata)
final TiffImageMetadata.GPSInfo gpsInfo = exifMetadata.getGPS();
if (null != gpsInfo)
final String gpsDescription = gpsInfo.toString();
final double longitude = gpsInfo.getLongitudeAsDegreesEast();
final double latitude = gpsInfo.getLatitudeAsDegreesNorth();
System.out.println(" " + "GPS Description: " + gpsDescription);
System.out.println(" " + "GPS Longitude (Degrees East): " + longitude);
System.out.println(" " + "GPS Latitude (Degrees North): " + latitude);
// more specific example of how to manually access GPS values
final TiffField gpsLatitudeRefField = jpegMetadata.findEXIFValueWithExactMatch(GpsTagConstants.GPS_TAG_GPS_LATITUDE_REF);
final TiffField gpsLatitudeField = jpegMetadata.findEXIFValueWithExactMatch(GpsTagConstants.GPS_TAG_GPS_LATITUDE);
final TiffField gpsLongitudeRefField = jpegMetadata.findEXIFValueWithExactMatch(GpsTagConstants.GPS_TAG_GPS_LONGITUDE_REF);
final TiffField gpsLongitudeField = jpegMetadata.findEXIFValueWithExactMatch(GpsTagConstants.GPS_TAG_GPS_LONGITUDE);
if (gpsLatitudeRefField != null && gpsLatitudeField != null && gpsLongitudeRefField != null && gpsLongitudeField != null)
// all of these values are strings.
final String gpsLatitudeRef = (String) gpsLatitudeRefField.getValue();
final RationalNumber[] gpsLatitude = (RationalNumber[]) (gpsLatitudeField.getValue());
final String gpsLongitudeRef = (String) gpsLongitudeRefField.getValue();
final RationalNumber[] gpsLongitude = (RationalNumber[]) gpsLongitudeField.getValue();
final RationalNumber gpsLatitudeDegrees = gpsLatitude[0];
final RationalNumber gpsLatitudeMinutes = gpsLatitude[1];
final RationalNumber gpsLatitudeSeconds = gpsLatitude[2];
final RationalNumber gpsLongitudeDegrees = gpsLongitude[0];
final RationalNumber gpsLongitudeMinutes = gpsLongitude[1];
final RationalNumber gpsLongitudeSeconds = gpsLongitude[2];
// This will format the gps info like so:
//
// gpsLatitude: 8 degrees, 40 minutes, 42.2 seconds S
// gpsLongitude: 115 degrees, 26 minutes, 21.8 seconds E
System.out.println(" " + "GPS Latitude: " + gpsLatitudeDegrees.toDisplayString() + " degrees, " + gpsLatitudeMinutes.toDisplayString() + " minutes, " + gpsLatitudeSeconds.toDisplayString() + " seconds " + gpsLatitudeRef);
System.out.println(" " + "GPS Longitude: " + gpsLongitudeDegrees.toDisplayString() + " degrees, " + gpsLongitudeMinutes.toDisplayString() + " minutes, " + gpsLongitudeSeconds.toDisplayString() + " seconds " + gpsLongitudeRef);
private static void printTagValue(final JpegImageMetadata jpegMetadata, TagInfo tagInfo)
final TiffField field = jpegMetadata.findEXIFValueWithExactMatch(tagInfo);
if (field == null)
System.out.println(tagInfo.name + ": " + "Not Found.");
else
System.out.println(tagInfo.name + ": " + field.getValueDescription());
public static void main(String[] args) throws IOException, ImageReadException
File sourceFile = new File("/Users/vivek/myimage.jpg");
readImageMeta(sourceFile);
上面的代码会给出这个输出
Exif metadata:
Root:
ImageWidth: 3024
ImageLength: 4032
BitsPerSample: 8, 8, 8
PhotometricInterpretation: 2
Make: 'Apple'
Model: 'iPhone 6s'
Orientation: 1
SamplesPerPixel: 3
XResolution: 72
YResolution: 72
ResolutionUnit: 2
Software: 'Adobe Photoshop CC 2015 (Macintosh)'
DateTime: '2016:05:17 16:55:55'
YCbCrPositioning: 1
ExifOffset: 300
GPSInfo: 868
Exif:
ExposureTime: 1/100 (0.01)
FNumber: 11/5 (2.2)
ExposureProgram: 2
PhotographicSensitivity: 40
ExifVersion: 48, 50, 50, 49
DateTimeOriginal: '2016:05:08 18:03:57'
DateTimeDigitized: '2016:05:08 18:03:57'
ComponentsConfiguration: 1, 2, 3, 0
ShutterSpeedValue: 35113/5284 (6.645)
ApertureValue: 7983/3509 (2.275)
BrightnessValue: 13026/2395 (5.439)
ExposureCompensation: 0
MeteringMode: 5
Flash: 16
FocalLength: 83/20 (4.15)
SubjectArea: 618, 1555, 310, 311
SubSecTimeOriginal: '523'
SubSecTimeDigitized: '523'
FlashpixVersion: 48, 49, 48, 48
ColorSpace: 1
ExifImageWidth: 3024
ExifImageLength: 4032
SensingMethod: 2
SceneType: 1
CustomRendered: 4
ExposureMode: 0
WhiteBalance: 0
FocalLengthIn35mmFormat: 29
SceneCaptureType: 0
LensSpecification: 83/20 (4.15), 83/20 (4.15), 11/5 (2.2), 11/5 (2.2)
LensMake: 'Apple'
LensModel: 'iPhone 6s back camera 4.15mm f/2.2'
Gps:
GPSLatitudeRef: 'N'
GPSLatitude: 13, 21, 3305/100 (33.05)
GPSLongitudeRef: 'E'
GPSLongitude: 75, 33, 2034/100 (20.34)
GPSAltitudeRef: 0
GPSAltitude: 83651/95 (880.537)
GPSTimeStamp: 12, 33, 57
GPSSpeedRef: 'K'
GPSSpeed: 21/100 (0.21)
GPSImgDirectionRef: 'T'
GPSImgDirection: 1654/31 (53.355)
GPSDestBearingRef: 'T'
GPSDestBearing: 1654/31 (53.355)
GPSDateStamp: '2016:05:08'
Unknown Tag (0x1f): 5
Sub: (jpegImageData)
Compression: 6
XResolution: 72
YResolution: 72
ResolutionUnit: 2
JpgFromRawStart: 1274
JpgFromRawLength: 8211
Photoshop (IPTC) metadata:
Date Created: 20160508
Time Created: 180357+0000
--------------------------------------------------------------------------------
GPSLatitudeRef: 'N'
GPSLatitude: 13, 21, 3305/100 (33.05)
GPSLongitudeRef: 'E'
GPSLongitude: 75, 33, 2034/100 (20.34)
GPS Description: [GPS. Latitude: 13 degrees, 21 minutes, 33.05 seconds N, Longitude: 75 degrees, 33 minutes, 20.34 seconds E]
GPS Longitude (Degrees East): 75.55565
GPS Latitude (Degrees North): 13.359180555555556
GPS Latitude: 13 degrees, 21 minutes, 33.05 seconds N
GPS Longitude: 75 degrees, 33 minutes, 20.34 seconds E
更多参考库文档here Maven 回购链接here. 注意：目前它是 alpha 版本，但您可以信任 apache：D。
干杯！
【讨论】：
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