Introduction to GPS-Photo Link. By GeoSpatial Experts. Modified by NRCS Nebraska for use as a Field Office Step by Step Guide. Viewing Instructions : Click left mouse or press Enter to continue slide show Modified for Printing as a Step by Step Guide. How to use GPS-Photo Link.
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By GeoSpatial Experts
Modified by NRCS Nebraska for use as a Field Office Step by Step Guide.
Viewing Instructions :
Click left mouse or press Enter to continue slide show
Modified for Printing as a Step by Step Guide.
Slides 3 - 4
Slides 5 – 7
Slides 9 – 10
Slides 11 – 19
Slides 20 – 28
In the Field
Back at Computer
ESRI ArcView & ArcGIS
GPS-Photo Link is software that “links” digital photos to the GPS coordinates where they were taken WITHOUT any connecting wires in the field.
What if the camera and GPS are not set to the same time?
GPS-Photo Link allows you to correct for differences when you run the program.
Garmin Waypoints or Track Logs can be used as the source of the GPS information for digital photos.GPS Setup/Use
1) Select options as shown.
2) Change “Camera Folder” using […] button to select the directory created under the customer folder that contains the photos copied from the camera. Note that screen will update with # photos found in the directory.
3) Change “Photo Root Folder” to the same folder used for “Camera Folder” above.
4) Name “New Folder to be created…” as “GPS_PHOTO_LINK”.
5) For “Original Photo Action”, select “Move photos to output folder” or “No Action”. See [Help] for more info on option.
6) Click [Next>]
Feel free to play with the settings as you get more comfortable with the software.
1) Connect GPS unit to the computer COM port. Turn on GPS unit and verify “Interface” = GARMIN. Switch Garmin to “Start Simulator” mode. (see top of page 15 in GPS Note doc)
2) Select options as shown.
3) Change “Download” options accordingly. This example uses Garmin Track Logs with GPS unit “on port” COM 1.
4) “Datum/Position Format” should match GPS unit settings. (see page 7 in GPS Note doc)
5) Click [Next>] and the “Downloading…” progress bar shows the GPS data process.
1) Select options as shown.
2) Note the option to use “GPS position only if within X seconds” limits which GPS locations will be used. Uncheck this if using Waypoints and you forgot to take a photo within the specified time.
3) Review Matching options below
4) Always check the box for ”Auto adjust for daylight savings”.
5) Click [Next>]
- Match to closest GPS point - Matches the photo time to the nearest GPS point, whether it is before or after the photo was taken.
- Interpolate between closest track points - This option will compute the position of the photo by interpolating between the two points in the track log closest to the photo time.
- Match to closest point BEFORE photo - Matches to the closest GPS point that occurred before the photo was taken.
- Match to closest point AFTER photo - Matches to the closest GPS point that occurred after the photo was taken.
1) Select photo, click once on the photo filename listed.
2) Find photo of the GPS unit.
3) Enter GPS Unit time displayed in photo.
4) The software calculates the time offset between the GPS unit time and the time recorded in the photo file.
- The photo file contains an internal time stamp, it is not displayed on the photo itself.
- Note large offset in this example. The camera local time has not been updated for daylight savings. It maybe worth while to adjust the camera time setting (slide 5) to more closely match the correct time, but not necessary. DO NOT CHANGE CAMERA TIME AFTER TAKING PICTURE OF GPS TIME!
- Note you can exclude this picture in the final output.
1) Review each photo. Select photo, click once on the photo filename listed.
2) Use “Photo attributes” options to adjust Brightness, Contrast or Rotate Images.
3) Select check box to “exclude” bad or unwanted photos from the final output.
- Note, if you selected the option to “Move Photos to output folder” on slide 12, the photos checked for not including will be permanently deleted.
4) Click [OK] after reviewing all photos listed.
1) Select options.
2) Select [Help] to review all the available options.
3) Renaming photo files is a nice option.
4) If you create web pages, consider downloading all web page images to local file.
- This will enable you to better distribute the web pages without need for internet access. For example: writing the folder to a CD ROM for the producer to look at on his/her home computer.
5) Click [Finish] and processing begins.
Feel free to play with the settings to find your desired output.
1) Double click “index.htm” to open the created home web page.
2) Each photo has a web page.
3) Note all files renamed to the “Photo Comment” from the “Extra Data Entry” screen (slide 18).
4) Note in example, original photo was moved to “GPS_PHOTO_LINK” directory from directory “grp_photo_followup_nov_04”.
5) The original photo with GPS info appended is named with “_tag”.
5) ArcView shapefile created named “picture” which can be used with the ArcView Extension for viewing “Hot Linked Photos” in ArcView.
6) Garmin Track Log saved ArcView shapefile named “track”.
1) Overview map shows where all the photos were taken.
2) Click on a point and that photos individual web page will appear.
3) Click on a thumbnail photo and that photos individual webpage will appear.
1) Individual photo web page includes watermarked photo, maps downloaded from internet and information about the photo.
2) You can move the original photo site investigation folder to any other location and the web pages will work.
3) Write the folder to a CD-ROM to give to the producer for review on his/her home computer. In this example, after creating the CD-ROM the producer would open the file:
1) Copy the “gpl.avx” ArcView Extension file (C:\Program Files\GPS-Photo Link\gpl.avx) to “C:\ESRI\AV_GIS30\ARCVIEW\EXT32”.
2) Start ArcView and select File>Extensions….
3) In the Extensions pop-up window place a check mark in the box for GPS-Photo Link and click [OK].
4) Note we have added the “picture” shapefile from the output directory shown on slide 20, turned it on and made it “Active” (raised).
5) The Photo Link [camera] button is now available.
1) Click and hold down on the [camera] button.
- Select the “blue” camera for showing the photo in an ArcView view. -Note attempting to use JPG images may result in Segmentation Error as JPG is not a default ArcView HOT LINK type.
- Select the “green” camera for showing the photo using Windows default JPG viewer.
2) Click on a point from the “picture” shapefile and the photo will open for viewing.
1) In this example we have some old site photos we would like to link to an old GPS point shapefile called “photo_points_2004”. This can be done in ArcView using the HOT LINK tools.
- NOTE, ArcView default HOT LINK Tool does not handle JPG Images. In this example we first had to open the original JPG file and save it as a GIF, which ArcView will handle (BMP, TIFF will also work but may result in very large files).
1) Edit the point table to include an attribute field with the filename of the photo you wish to hot link.
2) With the point theme active select Theme>Properties.
3) In the theme properties window, select the Hot Link icon along the left side and fill in the drop down items.
4) With the point theme active, note the [lightning bolt] hot link button in the View button bar, click it once.
5) Click on the point in the view and the linked photo will appear.
1) The ArcGIS Extension is installed when the GPS Photo Link Software is installed.
2) Open ArcGIS.
3) [Right Click] in the tool bar area.
4) Scroll down the pop-up menu and select “Customize…”
5) In the Customize pop-up window, under the [Toolbars] tab, place a check mark next to “GPS-Photo Link”.
6) Click [Close] in the Customize pop-up window.