Location and JPEG images of photographs of the riverbed collected by the U.S. Geological Survey within the St. Clair River between Michigan and Ontario, Canada, 2008 (ESRI VECTOR SHAPEFILE and JPEG Images, 08016_PHOTO.SHP)

Video and digital photographs were collected at 37 stations using the USGS Mini SEABOSS (Blackwood and Parolski, 2001). Mini SEABOSS stations were selected based on preliminary acoustic-backscatter mosaics, with the objective of characterizing broad areas of different backscatter intensity. With the Mini SEABOSS deployed, the research vessel was allowed to drift with occasional power from the vessel to control drift direction. Continuous video was collected over a total of 11.5 km of lake and riverbed. Video drift position was derived from the HYPACK® navigation files based on the start and end times of the drift. For some portions of the drift, there was no navigation, so the position was derived from the time and position stamp in the video at 30-s intervals. A total of 449 photographs were obtained from a digital still camera at user-selected locations along the video drifts.
Gaps in sequential photo numbers exist. If the camera was triggered accidentally on deck or the photograph was of poor quality or location (e.g. photograph within water column), the photograph was not saved.
Grab samples of the surficial sediment were collected at 15 stations, typically at the end of a drift. The upper 2 cm of sediment was scraped from the surface of the sample for texture analysis. Sediment samples were collected at locations with relatively fine-grained sediment (sand or mud). Samples were not collected in gravel or cobble areas where gravel prevented full closure of the sampler and resulted in a washed-out sample.
A total of 13 bottom samples were submitted for grain-size analysis. Two partially recovered, washed-out samples were not submitted. Grain-size analysis was performed at the USGS Sediment Laboratory at WHCMSC using methods described by Poppe and others (2005).
The mini-SEABOSS is housed with a Minolta CO., LTD, DiMAGE 7Hi camera. The full resolution of the acquired images is 2560 x 1920 pixels.
The EXIF header of the JPEG images contains the time the photo was taken (UTC times) as well as information about the camera used and resolution of the images.

A total of 449 bottom photographs were obtained from a digital camera configured on the mini-SEABOSS. The photographs were taken at user-selected locations along the mini-SEABOSS video drifts.
Sample locations for sample 1 and 2 were read from the video time stamp, as HYPACK navigation was not available. The position information at the end of the video drift was used as position of the sample. (Samples were acquired at the end of video drifts).

Parsed the HYPACK raw navigation for latitude, longitude, time, Julian day, and year, and added Survey ID 08016 by executing a Python script lat_long_fix.py from an xterm (Mac OS X).
Mac OS X (snow leopard 10.6.4)

Concatenated the parsed navigation files and edited the file with vi to add missing locations (HYPACK navigation unavailable) for stations 1 and 2, which were read from the video time stamp.
vi, Mac OSX 10.6.4

Extracted time from the "Date Picture Taken" in the Exchangeable Image File (EXIF) format header of the quality JPEG bottom photographs using uses the Python script sda_vexiftool_mod12.py (v.Jan18.2007) from an xterm (Mac OS X).

Create ESRI shapefile joining the bottom photo name with the navigation based on matching date and time fields running the Python script sda_hotlink_8.py (v.Feb.23.2005) from PythonWin.
A 'hyperlink' field was added to the attribute table and used to hotlink to the bottom photos.

The digital images were recorded on a compact flash card within the camera. Digital images were downloaded to a local disk and stored within folders with a naming convention based on the Julian Day of data collection. For example, 'bottomphotos155' contains all digital images collected during Julian Day 155.
Full resolution JPEG images were desampled in order to create an image set that would enable faster download.
The following command was used to resize the JPEG images:
convert -file.JPG -resize 25% file_sm.JPG
Mac OSX 10.6.4; convert

Edits to the metadata were made to fix any errors that MP v 2.9.36 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). The link to the data in the Distribution_Information section had to be fixed. Attempted to modify http to https where appropriate. Reordered the links in the identification section to have a landing page link as the first link. Moved the minimal source information provided to make it the first process step. The distribution format name was modified in an attempt to be more consistent with other metadata files of the same data format. Added the distribution format JPEG to account for the JPEG images in the zip file. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent.

Added keywords section with USGS persistent identifier as theme keyword.