Location of bottom photographs along with images collected by the U.S. Geological Survey in 2015 along the Delmarva Peninsula, MD and VA (JPEG images and Esri point shapefile, Geographic, WGS 84)

DGPS and WAAS navigation for the Hemisphere receiver (located on the acquisition van) were logged in HYPACK software (versions 13.0.9.21 and 15.0.9.71). A python script called parseHYPACK_gui_sort_all.py (WHCMSC script) was used to search all HYPACK files from the sampling Julian days (JD 195-197) and pull out the GPGGA (nav) string (Device 0) and time and write out a parsed navigation file for all the sample and photograph stations.

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 (WHCMSC script). 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 31 minutes and 10 seconds behind GPS time, and the Hero 3+ was 1 second ahead of 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, WHCMSC script) to join the bottom photo with the parsed HYPACK navigation file by matching the time offset field for Hero 2 photos (31 minutes, 10 seconds) and Hero 3+ photos (1 second) with the navigation file.

Once the shapefile was created that joined the latitude and longitude from the HYPACK navigation with a photo from each station, some fields were deleted that were no longer needed including the camera time and time offset fields for Hero 2 and Hero 3. Several attributes were added in Esri ArcGIS (version 10.3.1) using the Spatial Join Tool. This tool was run with the sediment sample shapefile (containing sample analysis information) to assign a station name for the accompanying sediment sample (FIELD_NO) and also the sediment classification (Folk scheme) of the accompanying sediment sample (CLASSIFICA). Bottom photo and sediment sample locations are not exactly coincident as the ship drifted during the collection of bottom photos.

XTools Pro (version 12.0) for ArcGIS (version 10.3.1) 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 and samples (DEVICE_ID), the survey vessel (VEHICLE_ID), and the Camera (CAMERA: either Hero 2 or Hero 3). Finally, the two separate camera shapefiles (Hero 2 and Hero 3) were merged into one shapefile using the ArcToolbox (version 10.3) MERGE tool (DATA MANAGEMENT TOOLS – GENERAL - MERGE).

The photo locations were exported from ArcMap (version 10.3.1) using XTools Pro (version 12.0) as a comma-delimited text file. The attributes chosen for export were: GPSTIME, 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 day in the shapefile. A Python version 2.7.3 script (writeexif_2_readfile_11_24_15.py, WHCMSC script) 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. 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 2015-001-FA (http://cmgds.marine.usgs.gov/fan_info.php?fan=2015-001-FA). Released as part of publication DOI:10.5066/F7P55KK3.

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 2015-001-FA

Artist: USGS
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: emsweeney@usgs.gov
Keywords: Bottom photo, Delmarva Peninsula, 2015-001-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 2015-001-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 2015-001-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 photos/*.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 Hero 3 files.

comment=Photo from down-looking GoPro HERO 3+ camera on the USGS SEABOSS deployed from the M/V Scarlett Isabella during survey 2015-001-FA (http://cmgds.marine.usgs.gov/fan_info.php?fan=2015-001-FA). Released as part of publication DOI:10.5066/F7P55KK3.

keywords Bottom photo, Delmarva Peninsula, 2015-001-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.