Geotag Photo - PowerPoint Presen by fjwuxn


									1.GPS Software, data download and conversion,

2.Google Earth, Integration of GPS and digital

3. Global Geo-referenced Field Photo Library
             Garmin 76
• Mapsource: connect gps, download
  waypoints, tracks.
• Active track and saved track
• Save as gpx.
         GPS eXchange Format

• GPX, or GPS eXchange Format is an XML schema
  designed for describing GPS data between software
• It can be used to describe waypoints, tracks, and routes.
  The format is open and can be used without the need to
  pay licence fees. Its tags store location, elevation, and
  time and can in this way be used to interchange data
  between GPS devices and software packages. Such
  computer programs allow you for example to view your
  track, project your track on satellite images (in Google
  Earth), annotate maps, and tag photographs with the
  geolocation in the Exif metadata.
           GPS eXchange Format

• In GPX, a collection of points, with no sequential relationship (the
  county towns of England, say, or all Skyscrapers in New York), is
  deemed a collection of individual waypoints. An ordered collection of
  points may be expressed as a track or a route. Conceptually, tracks
  are a record of where a person has been, routes are suggestions
  about where they might go in the future. So, for instance, there
  might be timestamps for each point in a track (because someone is
  recording where and when they were there), but timestamps for
  each point in a route are unlikely to be provided, because the author
  is suggesting it, and nobody might ever have travelled it.
• The minimum properties for a GPX file are latitude and longitude for
  a single waypoint. All other variables are optional.
•   Connect datalogger to your computer
•   Copy the .log file to your computer
•   Open the .log file
•   This file is in NMEA format
                         NMEA 0183
•   NMEA 0183 (or NMEA for short) is a combined electrical and data
    specification for communication between marine electronic devices such as
    echo sounder, sonars, anemometer (wind speed and direction),
    gyrocompass, autopilot, GPS receivers and many other types of
    instruments. It has been defined by, and is controlled by, the U.S.-based
    National Marine Electronics Association.
•   The NMEA 0183 standard uses a simple ASCII, serial communications
    protocol that defines how data is transmitted in a "sentence" from one
    "talker" to multiple "listeners" at a time. Through the use of intermediate
    expanders, a talker can have a unidirectional conversation with a nearly
    unlimited number of listeners, and using multiplexers, multiple sensors can
    talk to a single computer port. Third-party switches are available that can
    establish a primary and secondary talker, with automatic failover if the
    primary fails.
•   At the application layer, the standard also defines the contents of each
    sentence (message) type so that all listeners can parse messages
              NMEA 0183
• Each message starting character is a
  dollar sign.
• The next five characters identify the type
  of message (talker).
• All data fields that follow are comma-
• The first character that immediately follows
  the last data field character is an asterisk.
• Copy and open GPSBabel
• Convert NEMA to gpx
    Open gpx in Google Earth
• Google Earth 5.0
  Geotag photo with gps record
• Exif information
• GPicSync
• Exchangeable image file format (Exif) is
  a specification for the image file format
  used by digital cameras. The specification
  uses the existing JPEG, TIFF Rev. 6.0,
  and RIFF WAV file formats, with the
  addition of specific metadata tags. It is not
  supported in JPEG 2000, PNG, or GIF.
                Geolocation in Exif
•   The Exif format has standard tags for location information. Currently, only very few
    cameras, such as the Ricoh 500SE, Nikon Coolpix P6000 or some higher-end mobile
    phones, have a built-in GPS receiver and store the location information in the Exif
    header when the picture is taken.
•   For other cameras, such as Nikon D300, Nikon D90, or FinePix S5 Pro, a separate
    GPS receiver that fits into the flash connector or hot shoe is available.
•   Recorded GPS data can also be added to any digital photograph on a computer,
    either by correlating the time stamps of the photographs with a GPS record from a
    hand-held GPS receiver or manually using a map or mapping software. The process
    of adding geographic information to a photograph is known as geocoding. Photo
    sharing communities like Panoramio, locr or Flickr equally allow their users to upload
    geocoded pictures or to add geolocation information online.
•   Apple Inc. has added geocoding capabilities to the iPhone. The second generation
    iPhone (known as the iPhone 3G) is equipped with a GPS receiver, and uses the
    receiver to geotag the Exif data in photographs taken with the device. The first
    generation iPhone is not equipped with GPS, and uses nearby cellular phone towers
    to triangulate and approximate the location at which the picture was taken, which is
    then added to the Exif data associated with the picture.
• Exif data is embedded within the image file itself.
  While many recent image manipulation
  programs recognize and preserve Exif data
  when writing to a modified image, this is not the
  case for most older programs. Many image
  gallery programs also recognise Exif data and
  optionally display it alongside the images.
• Software libraries, such as libexif[1] and Exiv2[2]
  for C, or Image::ExifTool[3] for Perl, parse Exif
  data from files and read/write Exif tag values.
     Geotag using software
• GPicSync
• GPicSync automatically inserts location in
  your photos metadata so they can also be
  used with any 'geocode aware' application
  like Picasa/Google Earth, Flickr,, etc.
    Getting started with GPicSync

•   1) Set your GPS receiver and your camera
•   2) Go outside and shoot
•   3) Come back home and sync
•   4) Enjoy your geolocalized pictures
•   5) Configuration file and optional tools
 1) Set your GPSr and camera
• Two possibilities here.
• a) Universal way
• If you didn't change its setting, your GPS records the track log with
  the GMT time (Greenwich Meridian Time) also know as UTC
  (Universal Time Co-ordinated). Set the time of your camera to GMT.
  You can see the actual GMT time at the bottom of this webpage (be
  precise at the second level):
• Setting your camera to GMT is practical since you won't have
  problems for summer/winter time or when you travel through time
  zones. Also set the camera date if necessary.
• b) Local way
• Set the local time of the camera precisely to the same local time
  indicated by the GPS. Also set the camera date if necessary.
      Go outside and shoot
• Take your GPS with you and make sure
  that it is recording a track log. Keep your
  GPS ON during all the time you take
  Come back home and sync
• Put the pictures you want to geolocalize in
  a folder. With the software of your choice
  (for example Mapsource on Windows)
  retrieve the track log as a .gpx file (a list of
  GPX capable software). Put the .gpx file
  preferably in the folder containing the
  pictures. You can also use a NMEA track
  (give a .txt extension) instead of the GPX
Install GPicSync from Sourceforge:
• download the .exe installer on Windows.
• download the tar.gz file on Linux if
  available (or directly make a SVN
  checkouk and read the readme.txt)
             Launch GPicSync
• select the pictures folder
• select the .gpx or NMEA file
• depending of the way you've set your camera
  and GPSr indicate the UTC Offset:
   – +1 in France, 0 in the UK, -8 for PST, -5 for EST,etc,
     You may need to add an hour for summer local time
     depending of your country policy
   – 0 if your camera is at GMT time
• hit the "synchronize !" button
           Timing is important
•   GPS records in UTM time
•   Your camera set up in local zone
•   Your camera should be set to right time.
•   You can also fix the wrong camera set up

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