Location of bottom photographs along with images collected by the U.S. Geological Survey in 2014 along the Delmarva Peninsula, MD and VA (JPEG images and Esri point shapefile, Geographic, WGS 84)

DGPS navigation for the Hemisphere receiver located on the acquisition van were logged in HYPACK software (version 14.0.9.47). A python script called parseHYPACK_gui_sort_all.py was used to search all HYPACK files from the sampling Julian days and pull out the GPGGA (nav) string and time and write out a parsed navigation file for all the sample and photograph

Time of bottom photograph was extracted from the "Date Picture Taken" attribute in the EXchangeable Image File format (EXIF) header of the quality JPEG bottom photograph using a python tool called: JPEG_exifextract_gui_sort.py. A separate picture time file was created for each camera, Hero 2 and Hero 3.

Adjustments were made manually to the time picture taken file to account for time offsets between the time recorded in the JPEG EXIF "Date Picture Taken" attribute and the GPS time as verified by comparing calibration photos taken on the deck of the ship. Hero 2 was 12 seconds behind GPS time and Hero 3 was 19 seconds behind GPS time. To account for the time difference, an additional field was added to the photo 'time picture taken' file generated in the previous step. The new field of the time difference was populated using Microsoft Excel (version 2010) by auto-filling a linear series. The time difference is used for geolocating the photos in the subsequent processing step.

An Esri shapefile was created by using a python script (photo_locs_gui_5exif.py) to join the bottom photo with the parsed HYPACK navigation file by matching the smallest time offset field for Hero 2 photos (12 seconds) and Hero 3 photos (19 seconds).

Several unnecessary attribute fields were deleted from the bottom photograph shapefile, such as “GPS time” and “time offset”. Attribute fields for the accompanying sediment sample (FIELD_NO) and the sediment classification (Folk scheme) of the accompanying sediment sample (CLASSIFICA) were added to the shapefile in Esri ArcGIS (version 10.2.2) using the Spatial Join Tool.

XTools Pro (version 12.0) for ArcGIS (version 10.2.2) was used to add new fields (Table Operations --> Table Restructure) to the point shapefile including an attribute for the survey ID (CRUISE_ID), device used to collect the photos & samples (DEVICE_ID), the survey vessel (VEHICLE_ID), and the Camera (CAMERA: either Hero2 or Hero3) Finally, the two separate camera shapefiles (Hero2 & Hero3) were merged into one shapefile using ArcToolbox (version 10.2.2) Merge (data management -tool).

The photo locations were exported from ArcMap 9.3.1 using XTools Pro 7.1 as a comma-delimited text file. The attributes chosen for export were: TIME, PICNAME, LONG, LAT. Another column of information was added - yrdate - which had the year and date the photograph was taken in the format YYYYMMDD. This information was based on the Julian dat in the shapefile. A Python version 2.7.3 script (writeexif_2_readfile_11_24_15.py) was then run that incorporated this information, along with additional information, into the appropriate locations in the EXIF header of each full-resolution JPEG image. The PYTHON script uses ExifTool (version 9.4.6.0) to write the information to the image headers of the full-resolution images. These images will eventually be incorporated into the WHCMSC photo database and the EXIF header information is a requirement for the database.

The following tags were populated in the JPEG image headers. Information is duplicated in some tags. This was done because different software packages access different tags.

GPS tags: The values populated are unique for each image and based on the information exported from the photo locations shapefile.

GPSLatitudeRef
GPSLatitude
GPSLongitudeRef
GPSLongitude
GPSTimeStamp
GSPDateStamp

JPEG tags: The tag is listed along with the information used to populate it - which is the same for every image taken with a particular camera. The following information is based on the GoPro Hero 2 camera.

comment: Photo from down-looking GoPro HERO 2 camera on the USGS SEABOSS deployed from the M/V Scarlett Isabella during survey 2014-002-FA (http://cmgds.marine.usgs.gov/fan_info.php?fan=2014-002-FA). Released as part of publication DOI:10.5066/F7MW2F60.

EXIF tags: The tag is listed along with the information used to populate it - which is the same for every image.

ImageDescription: Photograph of the sea floor along the Delmarva Peninsula, MD and VA from survey 2014-002-FA

Artist: Seth Ackerman
Copyright: Public Domain - please credit U.S. Geological Survey

IPTC tags: The tag is listed along with the information used to populate it - which is the same for every image.

Credit: U.S. Geological Survey
Contact: sackerman@usgs.gov
Keywords: Delmarva Peninsula, 2014-002-FA, SEABOSS, sea floor, USGS, GoPro HERO 2
CopyrightNotice: Public Domain - please credit U.S. Geological Survey
Caption-Abstract: Photograph of the sea floor along the Delmarva Peninsula, MD and VA from survey 2014-002-FA

XMP tags: The tag is listed along with the information used to populate it - which is the same for every image.

Caption: Photograph of the sea floor along the Delmarva Peninsula, MD and VA from survey 2014-002-FA

To extract the information from the image headers using ExifTool, the following command can be used (tested with ExifTool version 9.4.6.0):

exiftool.exe -csv -f -filename -GPSTimeStamp -GPSLongitude -GPSLatitude -n -Artist -Credit -comment -keywords -Caption -Copyright -CopyrightNotice -Caption-Abstract -ImageDescription hero2/*.jpg > out.csv

The -csv flag writes the information out in a comma-delimited format. The -n option formats the latitude and longitude as signed decimal degrees.

The following tags are modified for the hero3 files.

comment=Photo from down-looking GoPro HERO 3+ camera on the USGS SEABOSS deployed from the M/V Scarlett Isabella during survey 2014-002-FA (http://cmgds.marine.usgs.gov/fan_info.php?fan=2014-002-FA). Released as part of publication DOI:10.5066/F7MW2F60.

keywords=Delmarva Peninsula, 2014-002-FA, SEABOSS, sea floor, USGS, GoPro HERO 3+

The online links to the data were updated to reflect the new server hosting the data. Additionally, other small edits could be made to the metadata, such as modifying http to https where appropriate. The metadata date (but not the metadata creator) was edited to reflect the date of these changes.

Added keywords section with USGS persistent identifier as theme keyword.