Sidescan sonar record of shipwreck

Multi-beam 3-D image of what appears to be a sunken LCVP. The same feature that is in image theb4047.

Multi-beam 3-D image of sunken vessel. Lower resolution multi-beam system than what is now available.

The main ship channel in upper Chesapeake Bay. This imaginative display uses both color and printed depths draped on a 3-D image.

An enlarged view of image theb4051. The main ship channel in upper Chesapeake Bay. This imaginative display uses both color and printed depths draped on a 3-D image.

Shaded relief model of seafloor showing pronounced sand wave field on left of image. Unclear if raised areas to right are artifacts or dredge spoil dump areas or some other man-made features.

Chesapeake Bay Diamond Shoal Project. This project was for the purpose of mapping oyster habitat for the Maryland Department of Natural Resources. This continued a function of the Coast Survey that began in the 1870's with mapping the oyster beds of Maryland, Virginia and many of the eastern seaboard and Gulf Coast states.

Chesapeake Bay Diamond Shoal Project. This project was for the purpose of mapping oyster habitat for the Maryland Department of Natural Resources. This continued a function of the Coast Survey that began in the 1870's with mapping the oyster beds of Maryland, Virginia and many of the eastern seaboard and Gulf Coast states.

This image is a false-color image of backscatter intensity over Diamond Shoal which gives an indication of bottom materials. The backscatter is from sidescan sonar emissions.

Sidescan sonar imagery was combined with multi-beam sounding data to produce 3-D reflectivity maps which were indicative of bottom materials.

Sub-meter backscatter resolution used to help determine bottom types at Diamond Shoal.

Sidescan sonar backscatter data combined with 3-D multi-beam data produced this map which showed a direct relationship between depth and type of bottom material in this area.

Multi-beam false color and printed depth presentation of Diamond Shoal.

The fancifully-named Sherwood Forest off the Dry Tortugas. 3-D image derived from multi-beam depth data.

Multi-beam sounding image of Fort Sumter Range, Charleston Harbor, showing potential hazards to shipping in dredged channel.

Pockmarked bottom area in Belfast area of Penobscot Bay. These sorts of features are found in many areas of Penobscot Bay.

Sidescan and multi-beam sonar images of the 4-masted schooner HERBERT D. MAXWELL which sunk after a collision on 16 May 1910 off Annapolis, Maryland.

Sidescan sonar image of the 4-masted schooner HERBERT D. MAXWELL which sunk after a collision on 16 May 1910 off Annapolis, Maryland.

Multi-beam sonar image of the 4-masted schooner HERBERT D. MAXWELL which sunk after a collision on 16 May 1910 off Annapolis, Maryland.

Multi-beam sonar image of the 4-masted schooner HERBERT D. MAXWELL which sunk after a collision on 16 May 1910 off Annapolis, Maryland.

Mystery image apparently derived from multi-beam sounding information. TBD at a later date.

Belfast Bay, Maine, pockmark field showing location and relative size of "pockmarks." Compare to image theb4063. Linear blank areas caused by lack of overlap between survey lines.

Belfast Bay, Maine, pockmarks as shown on sidescan sonar record and bottom penetration sonar.

Rock outcrops adjacent to high current area of sand waves. Possibly Portsmouth Harbor Channel

Depth coded by color on multi-beam display of 1999 survey area. Display also has depth information overprinted. The depths shown are a tiny percentage of the total depths observed with a modern multi-beam system.

Multi-beam sounding map of Bowie Seamount in the NE Pacific Ocean off British Columbia. Contours overlay color-coded depth ranges.

3-D single-beam sounding data of Bowie Seamount which was available prior to the survey data acquired in image theb4073. The red-colored peak is the seamount shown in image theb4073.

Unknown what imagery is depicting or how acquired.

Unidentified area of rugged bottom

Fathogram example of rugged bottom area

A triangulation station and signal on the Alaska Coast. In: Putnam, G.R. 1908. Nautical Charts. J. Wiley and Sons, New York.

Measuring angles with theodolite at triangulation station on Alaska Coast. In: Putnam, G.R. 1908. Nautical Charts. J. Wiley and Sons, New York.

Topographic survey party at work with plane table on the Pribilof Islands. In: Putnam, G.R. 1908. Nautical Charts. J. Wiley and Sons, New York.

Hydrographic party sounding with launch in Baltimore Harbor. In: Putnam, G.R. 1908. Nautical Charts. J. Wiley and Sons, New York.

The Lucas Automatic Sounding Machine for depths to 5000 fathoms, with engine. In: Putnam, G.R. 1908. Nautical Charts. J. Wiley and Sons, New York.

The Sigsbee Sounding Machine on a surveying vessel. In: Putnam, G.R. 1908. Nautical Charts. J. Wiley and Sons, New York.

Wiredrag diagram - Dragging for dangers with a long wire. In: Putnam, G.R. 1908. Nautical Charts. J. Wiley and Sons, New York.

Engraving a chart on a copper plate. In: Putnam, G.R. 1908. Nautical Charts. J. Wiley and Sons, New York.

Engraving soundings on a copper plate with a machine. In: Putnam, G.R. 1908. Nautical Charts. J. Wiley and Sons, New York.

Electrotyping plant for electrotyping chart plates. In: Putnam, G.R. 1908. Nautical Charts. J. Wiley and Sons, New York.

Printing charts from copper plates; final cleaning of the plate by hand; plate press on left. In: Putnam, G.R. 1908. Nautical Charts. J. Wiley and Sons,

Lithographing presses for printing charts; lithograph stone on transfer press. In: Putnam, G.R. 1908. Nautical Charts. J. Wiley and Sons, New York.

Field's protractor and parallel ruler in use on a chart, plotting bearing of a lighthouse. In: Putnam, G.R. 1908. Nautical Charts. J. Wiley and Sons,

Three-arm protractor in use on a chart, plotting position from two angles. In: Putnam, G.R. 1908. Nautical Charts. J. Wiley and Sons, New York.

Coast and Geodetic Survey Tide Predicting Machine No. 2. Dial case and front component section.

British Association Tide Predicting Machine.

Unidentified component of tide predicting machine.

Unidentified component of tide predicting machine.

Roberts Universal Tide Predictor.

Coast and Geodetic Survey Tide Predicting Machine No. 2. Time side.