Archive for the ‘History’ Category
The U.S. Board on Geographic Names recently named four previously unknown basins in the United States Exclusive Economic Zone (EEZ) in the Gulf of Mexico, honoring retired NOAA officers who mapped the area in the late 1980s and early 1990s. The names — Armstrong Basin, Floyd Basin, Matsushige Basin and Theberge Basin — were proposed by Texas A&M University, based on their new compilation of bathymetry drawn largely from the NOAA multibeam mapping project conducted by now-decommissioned NOAA ships Whiting and Mt. Mitchell.
A basin in the Gulf of Mexico was named after retired NOAA Captain Andrew Armstrong.
Retired NOAA Capt. Richard P. Floyd was the commanding officer of NOAA Ship Whiting from February 1990 to March 1992; he was followed by retired Capt. Andrew A. Armstrong III, who was CO from February 1992 to January 1994. Retired NOAA Capt. Roy K. Matsushige was commanding officer of NOAA Ship Mt. Mitchell from December 1988 to January 1991, followed by retired Capt. Albert E. Theberge, who served as CO from January to November 1991. The officers led the bathymetric mapping operations under the direction of NOAA’s Office of Charting and Geodetic Services, a predecessor of today’s Office of Coast Survey.
Cartographers rely on the Board of Geographic Names, for good reason!
Since 1890, federal cartographers have relied on the decisions of the U.S. Board on Geographic Names — the 125-year multi-agency federal program to standardize names of geographic features — that operates under the umbrella of the Department of the Interior.
“The Board on Geographic names has its intellectual roots in the earliest map-making efforts,” explains Theberge. To illustrate the need for standardization in the U.S., Theberge points to a November 7, 1805, report by the famed explorer William Clark.
“Ocian in view! O! the joy… Great joy in camp we are in view of the Ocian, this great Pacific Octean which we been So long anxious to See.”
As Theberge points out: “In one sentence, Clark gives the reasons for the Board.”
EEZ mapping project achieved policy and technical objectives for U.S.
The four NOAA commanding officers led surveys for the EEZ mapping project, which was active between 1984 and 1991. The project originated from President Ronald Reagan’s 1983 proclamation establishing a U.S. Exclusive Economic Zone, which created a 200-mile-wide nautical “belt” around the U.S. and territories, adding over 3,000,000 square nautical miles to the nation’s jurisdiction.
In response to the EEZ proclamation, both NOAA and the United States Geological Survey embarked on mapping programs. The USGS used a deep-water, very wide swath, side scan sonar system called GLORIA, which gave a qualitative picture of the seafloor somewhat akin to aerial photography; and NOAA used both medium depth multibeam sounding systems (150 meters to 1000 meters) and deep water systems (1000 meters depth to full oceanic depth), which gave quantitative (depth) values. As opposed to widely-spaced single beam trackline in deep water areas, NOAA’s program attained 100% bottom coverage with the then-new (to the civil community) multibeam systems.
The Gulf of Mexico was one region of the mapping program, as maps were produced for waters of the East Coast, Gulf of Mexico, West Coast, Alaska, and Hawaii. In a paper presented at the 1988 Exclusive Economic Zone Symposium, the goals of mapping in the Gulf of Mexico (actually applicable to all EEZ regions) were espoused:
- Build the foundation of a marine environmental geographic information system for solving global and regional change problems.
- Improve targeting of scientific and engineering efforts involving higher-cost, manned, submersible investigations and remotely-operated vehicle operations.
- Better manage the living and mineral resources of the EEZ.
- Better model the physical oceanography of the Gulf of Mexico, including factors affecting water mass movements, acoustic propagation paths, and sediment transport regimes.
- Model geological and geophysical hazards affecting coastal regions and offshore construction.
- Discover and/or define unique or previously unknown marine environments for designation as marine sanctuaries or protected areas.
- Improve and enhance nautical charts and bathymetric maps.
This early multibeam mapping effort helped develop many concepts that Coast Survey later built on in shallow water multibeam charting, such as methods for correcting and calibrating beam pointing errors, use of GPS, ray-bending algorithms to account for refraction of beams, etc. Philosophically, the project also helped pave the way for the era of digital paperless survey data acquisition and processing, as EEZ survey operations significantly reduced the vast amounts of paper fathograms, printouts, and other products that accompanied classical hydrographic survey operations.
In 1992, a report by the Marine Board of the National Research Council addressed the needs of mapping the EEZ. It noted:
“EEZ mapping and survey activities of the USGS and NOAA have been impressive, especially given the limits on funding, assets, and human resources. …The current activities depend on individual efforts and assets that are, in many instances, borrowed or diverted from other projects.”
By the time the report was written, circumstances — including the grounding of the Queen Elizabeth II in Martha’s Vineyard Sound — dictated that NOAA devote more resources to inshore charting. The EEZ project was terminated but it left a legacy of new and improved methods, as well as a gentle nudge towards a paradigm shift from primarily paper data acquisition to digital data acquisition.
We still use the digital data gathered by the EEZ mapping project. During the monitoring of the Deepwater Horizon oil spill, NOAA used the data as its underlying bathymetric dataset. The spill was near Whiting Dome and Mitchell Dome, which were named respectively for their discovery by the NOAA ships Whiting and Mt. Mitchell during the EEZ project.
New project picks up where the EEZ project left off
Today, a new national deep-water bathymetric mapping project is underway, picking up where the EEZ project left off. The Office of Coast Survey’s Joint Hydrographic Center at the University of New Hampshire, along with NOAA’s Office of Ocean Exploration, is leading the bathymetric mapping work of the interagency U.S. Extended Continental Shelf (ECS) Project. Using today’s modern high-resolution descendants of the multibeam systems aboard Whiting and Mt. Mitchell, the ECS Project the ECS Project is mapping the continental slope in several regions, including the Gulf of Mexico, to establish the outer limits of the U.S. continental shelf in areas beyond the 200 nautical mile EEZ. Andy Armstrong, of recently named Armstrong Basin fame, continues to use his bathymetric mapping expertise, now conducting mapping operations for the ECS Project.
The Office of Coast Survey dates from 1807, when much of the commerce between the states was by coastal shipping. And all foreign trade, especially critical to our prosperity, had to come by ship. With so many ships coming into our ports and harbors, shipwrecks were common, and it was clear the young maritime nation needed accurate nautical charts.
NINTH CONGRESS OF THE UNITED STATES
At the Second Session,
Begun and held at the city of Washington, in the territory of Columbia,
on Monday the first of December, one thousand eight
hundred and six.
AN ACT to provide for surveying the coasts of the United States.
Be it enacted by the Senate and House of Representatives of the United States of America, in Congress assembled, that the president of the United States shall be, and he is hereby authorized and requested, to cause a survey to be taken of the coasts of the United States, in which shall be designated the islands and shoals, with the roads or places of anchorage, within twenty leagues of any part of the shores of the United States; and also the respective courses and distances between the principal capes, or head lands, together with such other matters as he may deem proper for completing an accurate chart of every part of the coasts within the extent aforesaid.
Sec.2. And be it further enacted, that it shall be lawful for the president of the United States, to cause such examinations and observations to be made, with respect to St. George’s bank, and any other bank or shoal, and the soundings and currents beyond the distance aforesaid to the gulph stream, as in his opinion may be especially subservient to the commercial interests of the United States.
Sec. 3. And be it further enacted that the president of the United States shall be, and he is hereby authorized and requested, for any of the purposes aforesaid, to cause proper and intelligent persons to be employed, and also such of the public vessels in actual services, as he may judge expedient, and to give such instructions for regulating their conduct as to him may appear proper, according to the tenor of this act.
Sec. 4. And be further enacted, that for carrying this act into effect there shall be, and hereby is appropriated, a sum not exceeding fifty thousand dollars, to be paid out of any monies in the treasury not otherwise appropriated.
[signed] Nathan Macon, Speaker of the House of Representative
[signed] Geo. Clinton, Vice President of the United States, and President of the Senate
I certify that this act did originate in the House of Representatives.
[signed] John Beckley, Clerk
February 10, 1807
[signed] Thomas Jefferson
See the NOAA library for more resources on Coast Survey heritage
On September 2, 1945, the Japanese officially surrendered to end WWII. A photo from the day, showing Admiral Chester Nimitz signing the Japanese surrender document, has his personal message: “To Rear Admiral H. Arnold Karo, USC&GS — with best wishes and great appreciation of the assistance of the U. S. Coast and Geodetic Survey in making possible the above scene. C. W. Nimitz, Fleet Admiral, U. S. Navy.”
Adm. Nimitz was a signatory to the Instrument of Surrender. On this photo, he inscribed his appreciation for the contributions of U.S. Coast & Geodetic Survey personnel during WWII.
The U.S. Coast and Geodetic Survey was one of NOAA’s predecessor agencies, and today’s uniformed NOAA Corps had its beginnings with WWI, when the commissioned service of the USC&GS was formed. During WWII, the Coast and Geodetic Survey sent over 1000 civilian members and over half of its commissioned officers to the military services. (See The World Wars.) Coast Surveyors served as hydrographers, artillery surveyors, cartographers, army engineers, intelligence officers, and geophysicists in all theaters of the war. Civilians, on the home front, produced over 100 million maps and charts for the Allied forces. Eleven members of the USC&GS gave their lives during WWII.
In recent remembrance of the service and sacrifice of those men and women, Cmdr. Matt Wingate, commanding officer of NOAA’s Marine Operations Center ‒ Pacific Islands, recently wrote this report:
Fireworks lit up the Honolulu night on August 15. Seventy years ago — August 15, 1945 — Emperor Hirohito broadcast news of Japan’s surrender to the Japanese people — and the world. As a result, August 14 (because of the international dateline) and 15 are forever known as VJ Day or “Victory over Japan Day.”
Aug 15, 2015, Ford Island, Hawaii — The “Peace Fireworks” with NOAA’s new Inouye Regional Center silhouetted on the right.
To honor this historic event, the U.S. Navy and the cities of Honolulu, Hawaii, and Nagaoka, Japan, celebrated seventy years of peace with a solemn ceremony and spectacular fireworks. (Nagaoka is the home town of Admiral Yamamoto, the key planner behind the December 7, 1941, attack on Pearl Harbor.)
Aug 15, 2015, Ford Island, Hawaii — A restored Japanese Zero flies over NOAA Ship Oscar Elton Sette in commemoration of seventy years of peace between Japan and the United States.
As I watched the fireworks with shipmates aboard NOAA Ship Oscar Elton Sette, an overwhelming sense of pride and humility descended. Proud to be witnessing such a historic event, proud to be part of this amazing agency and its legacy, and also humbled by history. What a difference 70 years can make. Take a look at the historic photo with Admiral Nimitz’s signed note. I hope you get goose bumps at what he wrote to the U.S. Coast & Geodetic Survey director, Rear Admiral Karo. That’s a proud chapter of our legacy!
Something happened recently that also made me proud of our mariners. I recently met the chief of staff for Joint Base Pearl Harbor Hickham. We were scheduled to meet for 30 minutes, but the meeting extended to almost an hour because the commander was so intrigued with NOAA’s mission and the mariners who sail NOAA ships. The amount of time NOAA mariners spend at sea was especially impactful on him. As I left him, I was proud of our mariners and their salty heritage. His admiration for NOAA’s mariners was palpable.
I hope NOAA mariners hold that feeling in your work vests, and pull it out when needed. Stay focused, stay safe, and be proud of your efforts. Others certainly are.
Alaska’s nautical charts need to be updated — we all know that. The diagram below shows the vintage of survey data currently used for today’s charts in Alaska. The graphic includes all surveys done by NOAA’s Office of Coast Survey (and its predecessors), and some limited data acquired by other agencies, i.e., the U.S. Coast Guard. Areas that are not colored in have never been surveyed or have data acquired by another source — from Russia or Japan, for instance — before the U.S. was responsible for charting in that area.
What are the differences between data collected in 1900, 1940, or 1960? Let’s take a look at a…
Brief Historical Sketch of Survey Technologies
Nautical charts have a lot of information, but mariners especially are concerned with two major components: water depths (known as “soundings”) and obstructions (like underwater seamounts or wrecks).
Different eras used different technologies to find, measure, and determine the position of the two components. Note that adoption of new systems does not happen abruptly; rather, new technologies are phased in as techniques and equipment improves.
Measuring Water Depth (Soundings)
3.7 million years ago to present day: sounding pole
It isn’t inconceivable that the earliest humanoid, Australopithecus afarensis, used sticks to gauge water depths before crossing streams and rivers. People still do it today.
Note the ancient Egyptian on the far right, using a sounding pole.
~ 2000 B.C. to 1930s: lead line
As good as they were for their eras, 19th and 20th century surveyors faced technological challenges. The first challenge was accounting for gaps between depth measurements. The second was the inability to be totally accurate in noting the position of the measurement. (In other words, a specific location out in the ocean may be 50 feet deep, but a surveyor must also accurately note the position of that specific location.)
This surveyor is casting a lead line.
Early Coast Survey hydrographers measured depths by lead lines — ropes with lead on one end — that were lowered into the water and read manually. Even though soundings were generally accurate, coverage between single soundings was lacking. And we need to remember that this was before the age of GPS. While sextants gave accurate positions when a hydrographer could fix on a shoreline feature, the further offshore the survey, the less accurate the position.
(Interesting fact: Hydrographers still use lead lines occasionally, in some circumstances — but not for a complete survey.)
There have been variations on lead lines through the centuries. From 1492 to the late 1870s, for instance, mariners used hemp rope for deep-sea soundings.
(Interesting fact: Christopher Columbus and Ferdinand Magellan each tried to measure mid-ocean depths with about 1,200 feet of hemp rope. Neither one of them found the sea bottom.)
In 1872, the hemp was replaced by small diameter piano wire (again, primarily for deep-sea work), and the weight of the lead was increased. Later, hydrographers added a motorized drum to wind and unwind the line, with a dial to record the length of the line.
(Interesting fact: In 1950, the British ship Challenger used piano wire in the first sounding that established Mariana Trench as the deepest place on earth.)
20th century to the present: echo sounders
Compare the bottom coverage achieved by the different survey methods.
1918 to 1990s: single beam echo sounder
Sonar came into its own in 1913. The first echo sounders (also known as “fathometers”) had single beams that measured the distance of the sea floor directly below a vessel. The echo sounders were able to take many more depth measurements than was possible with the lead line, but the technique still resulted in gaps between the lines where the beam measured the water depth.
The U.S. Coast and Geodetic Survey (a NOAA predecessor agency) adopted this acoustic sounding technique in 1923, installing it on USCGS Ship Guide. But full-fledged change didn’t happen right away. These early sounding systems were too large to install on survey launches used in harbor and inshore work, so from 1924 until the early 1940s many surveys were still conducted with a lead line, and many were totally acoustic — and some were hybrid, using soundings from both methods, depending on coverage area and seafloor configuration.
→ 1940: U.S. Coast and Geodetic Survey fully adopts single beam echo sounding technology
The development of smaller “portable” fathometers for shallow waters, about 1940, was a primary impetus in the obsolescence of lead line as survey technology and the adoption of acoustic systems. The development of World War II electronic navigation systems for bombing purposes led to the development in 1945 of the first survey-quality electronic navigation systems, which allowed for more accuracy in positioning.
1964 to current day: multibeam echo sounder
By mid-century, scientists were increasing the beams projected by the echo sounder, to get a broader swath of measurements. The multibeam echo sounder was developed for the Navy in 1964, but it remained secret until the late 1970s when commercially available systems were developed.
Coast Survey first used a MBES technique, called the “Bathymetric Swath Survey System,” in 1977 on NOAA Ship Davidson, for depths ranging from 160 to 2,000 feet. In 1980, NOAA Ship Surveyor installed a deep-water MBES system called “Sea Beam,” for depths from 1,600 to 33,000 feet.
About 1986, Coast Survey began using GPS to calibrate medium-frequency navigation systems while operating in the far reaches of the United States Exclusive Economic Zone. By the mid-1990s, GPS was the primary control for accurate positioning.
→ 2000: Coast Survey fully adopts multibeam surveying
By 2000, Coast Survey was performing full-coverage multibeam hydrographic surveys for charting purposes. NOAA survey ships now use multibeam echo sounders that measure navigable coastal depths from 45 to 1,000 feet. For shallower and more constricted waters, the ships deploy hydrographic survey launches with multibeam echo sounders that efficiently and safely survey areas from 12 to 200 feet deep. These systems make it possible to acquire 100% sea floor coverage in the survey grounds (excluding ultra-shallow, near-shore, or obstruction areas).
Finding Underwater Obstructions
1880s to early 1990s: wire drag
Surveyors used wire drag, not as a sounding system but as a way to look between the sounding lines to find obstructions to navigation and establish safe navigational channels. The first documented wire drag was conducted in the 1880s, in French Indochina, Gulf of Tonkin area, attaching the wire to buoys at each end and letting it drift with tidal currents.
Around 1900, the U. S. Lake Survey developed the technique of using a ¼-mile wire drag between two boats. In 1903, Coast Survey began using the technique, and within a few years was using it extensively in Alaskan waters as they looked for pinnacle rocks. Coast Survey’s Alaska wire drags were up to 3.5 miles long. (Initially, “least depths” over discovered obstructions were determined by lead line, then acoustic means and, ultimately, by divers with depth/pressure gauges.)
Survey vessels conduct wire drag operations.
1960 to present day: side scan sonar
Side scan sonar is essentially the sonar equivalent of an aerial photograph. It improves the ability to identify submerged wrecks and obstructions. Evolving from submarine detection sonars of World War I and World War II, side scan sonar was fairly well developed by 1960, when the United Kingdom Hydrographic Office started using it regularly with their surveys.
→ 1990: Coast Survey fully adopts side scan sonar for East Coast and Gulf Coast surveys
NOAA Ship Whiting used the technology in 1984-1985 for approaches to New York. U.S. Coast Survey fully adopted side scan sonar (in place of wire drag) in the early 1990s.
Side scan sonar operations use “towfish” like this one, lowered into the water and towed from the back of the vessel.
Side scan sonar captures images of objects, which improves the ability to identify submerged objects.
Today’s Charts Reflect Different Tech Eras
Each of NOAA’s 1000-plus nautical charts, even today, can contain information collected by any or all of these sounding and positioning techniques.
Most nautical charts are an amalgamation of geospatial information collected using different techniques at different times. For example, one area of a specific current-day nautical chart might be based on a lead line and sextant survey conducted in 1910, and another area on the same chart might be based on a multibeam and GPS survey conducted in 2010. If we dig deep enough, we will probably find a sounding or two from the 18th century British explorer, Captain James Cook.
NOAA cartographers mold this disparate information so that it fits together as a coherent representation of the geographic area.
So when was the data acquired for the chart you’re using? NOAA cartographers add a “source diagram” to large-scale charts. (See the diagram on the current chart 16240, pictured below.) Check yours. That will give you the years of the surveys… and now you have a better idea on the technology used by the surveyor.
This is the source diagram on nautical chart 16240.
Sunday, June 21, was World Hydrography Day, a day set aside to recognize the important work of hydrographers. Measuring and describing the physical features of oceans, seas, and coastal areas is essential not only to the safe navigation of the everyday mariner, but to our nation’s economic development, security and defense, scientific research, and environmental protection.
The NOAA flag flies at the Absecon Lighthouse during the memorial dedication. Photo by David Hall
This year’s observation was particularly noteworthy for NOAA, as we honored the lost crew members of the U.S. Coast Survey Steamer Robert J. Walker, by dedicating a memorial at the Absecon Lighthouse in New Jersey.
On June 21, 1860, the Robert J. Walker was hit by a commercial schooner while transiting from Norfolk to New York after months of surveying in the Gulf of Mexico. The ship sank 12 miles offshore, as they were heading to the Absecon Lighthouse after they were hit. Coast Survey lost twenty crew members that night, and another man died from his injuries the next day, in the largest single loss of life in Coast Survey and NOAA history.
Dr. James Delgado, director of maritime heritage at NOAA’s Office of National Marine Sanctuaries, described the events of that long-ago day, and spoke of the partnership between NOAA and the New Jersey diving community in identifying the previously unidentified wreck.
Steve Nagiewicz, co-director of the Robert J. Walker Mapping Project, recognized a dozen private citizens who assisted with the project, as he talked about the importance of collaborative efforts in conserving the nation’s maritime history.
Steve Nagiewicz (center) and Dr. James Delgado (second from left) recognized the collaboration between NOAA and private citizens in identifying and conserving the Robert J. Walker wreck. Photo by Dawn Forsythe
Rear Admiral Gerd Glang, director of NOAA’s Office of Coast Survey, dedicated the memorial.
“With this memorial duly dedicated, we are assured that future generations will know what happened off these shores,” Glang said. “They will remember the sacrifices made to make our nation’s coasts safe. And they will give these crew members a permanent honor that was so long denied.”
A historic hydrographer’s bell rang for every crew member that lost their life, similar to the memorial service held two years ago.
Rear Admiral Gerd Glang dedicated the Walker memorial, with James Delgado and Cheryl Oliver. Photo by Dawn Forsythe
On the grounds of the Absecon Lighthouse you will now find a memorial consisting of a NOAA commemorative geodetic marker, as well as a plaque honoring the lost crew members, placed in a compass rose on the grounds outside the lighthouse entrance. The plaque is an iconic image that was proposed by NOAA Corps Basic Officer Training Class 102, in a design project headed by Lt. Cmdr. Jeff Shoup.
In expressing NOAA’s appreciation for all involved in the project, Glang thanked two people in particular. First, he noted the persistent efforts of Skip Theberge, our NOAA historian and a retired NOAA commissioned officer.
“I would dare say that very few people in NOAA even knew about the Robert J. Walker until Captain Theberge told us about this tragic event,” Glang said. “It is because of his knowledge — and especially his persistence in telling the story — that NOAA made the effort to find and identify the Walker.”
Glang also offered special appreciation to Cheryl Oliver, exhibit manager for the Office of National Marine Sanctuaries and the senior program advisor for NOAA’s Preserve America Initiative. She is also the president of the U.S. Coast and Geodetic Survey Heritage Society. Cheryl was NOAA’s moving force behind the development of this memorial.
NOAA Preserve America Initiative advisor Cheryl Oliver and Maritime Heritage Program Director James Delgado at the Robert J. Walker interpretive sign at Absecon Lighthouse. Photo by David Hall
The Robert J. Walker was positively identified in 2013 after NOAA Ship Thomas Jefferson set aside a day to survey the site while it was in the area conducting operations after post tropical storm Sandy. The ship’s physical scientists were guided by historical accounts in the 1860 Coast Survey Annual Report. Then, using the Thomas Jefferson data and armed with additional information from researchers and archaeological advisers, divers pinpointed the exact location and confirmed the ship’s identity.
NOAA would like to express our appreciation to U.S. Coast Guard Station Atlantic City (in particular, Seaman Philip Zinna and Fireman Apprentice Christopher Barreras) for presenting the colors at the event.
A color guard from U.S. Coast Guard Station Atlantic City presents the colors. Photo by David Hall
Absecon Lighthouse Executive Director Jean Muchanic welcomed the crowd of 50 people to the Walker memorial dedication. Photo by David Hall
by Melissa Volkert, Coast Survey communications associate
NOAA’s Office of Coast Survey has added a wide range of publications to our Historical Map and Chart Collection. The collection of publications consists of annual reports, catalogs, United States Coast Pilot, Notes on the Coast, and special reports.
The collection contains over 35,000 documents from the earliest days of the U.S. Coast Survey.
- Annual Reports are yearly publications, from 1837 to 1965, that detail the many scientific and technological activities of Coast Survey.
- Aeronautical charts, U.S. nautical charts, charts of the Philippines, and the old U.S. Lake Survey charts are detailed in Catalogs.
- The Coast Pilot collection carries two centuries of volumes, from a 1796 version of the American Coast Pilot, through the 1800s and 1900s, until the 2012 versions of the U.S. Coast Pilot.
- Written in 1861 by the Coast Survey while Superintendent Alexander Bache served on the Blockade Strategy Board, Notes on the Coast were instrumental in the Union naval strategy during the Civil War.
- When geodetic, hydrographic, geophysical, and oceanographic methods were hard to find in annual reports, over 400 Special Reports, issued between 1898 and 1956, made the information easier to disseminate.
These publications provide context to the tens of thousands of maps and charts in the collection. Use the “Search Images” and “Search Publications” pages to explore the historic documents.
As an example, consider the great naturalist John Muir, whose 179th birthday is this month. He was a guide and artist on the Survey of the 39th Parallel across the Great Basin of Nevada and Utah from 1874 to 1877.
One result emerges: the 1875 Annual Report. This report notes, on page 62, that John Muir recorded the geological and botanical characteristics of Mount Shasta in Northern California. A “related maps” option, showing maps and other images mentioned in the publication, will be to the left of this result. In this case, the related maps include a map titled “Sketch Showing the Progress of the Survey on the Atlantic Gulf of Mexico and Pacific Coast of the United States with Sub Sketch Showing the Progress on the Pacific Coast.” This particular map was continually updated as new areas were surveyed and discovered. 1875 was the first year that Mt. Shasta was recorded on it.
You can also use the information from an image to locate a publication. This month marks the 99th anniversary of the 1906 San Francisco earthquake. Using Search Images on the Historical Map and Chart Collection:
Since this map is from 1907 and there are no images from 1906, assume findings after the earthquakes were not published until 1907.
- Search publications for the Annual Report of 1907.
- When the report is opened, use the “Ctrl+F” search function (press Ctrl & F together)
- Type California in the search bar that appears at the top right.
- California will be highlighted every time it is stated in the document.
On page 67, there is a section entitled “Earth Movements in the California Earthquake of 1906.” This section ‒ that highlights new vs. old triangulation, and the permanent displacements of the areas affected ‒ states, “…the effects of the earthquake of April 18, 1906, indicated that there had been relative displacements of the earth’s surface from 2 meters (7 feet) to 6 meters (20 feet) at various points near the great fault accompanying the earthquake.”
The tables indicate the permanent displacements of various points caused by the earthquake of 1906. These permanent displacements were determined by comparing the positions of identical points upon the earth’s surface as determined by triangulation before and after the earthquakes in question. (Discover how the U.S. Coast and Geodetic Survey aided the recovery of the San Francisco earthquakes of 1906 by reading the 1907 Annual Report.)
The Historical Map and Chart Collection documents Coast Survey’s discoveries throughout history. Make your own discoveries in the collection, and let us know if you have any comments, questions, or concerns.
The “slave density map,” created by the men of U.S. Coast Survey in 1861, is one of Coast Survey’s most treasured historical maps. Artist Francis Bicknell Carpenter included it in his painting, “First Reading of the Emancipation Proclamation of President Lincoln,” because Lincoln consulted it so often in devising his military strategy. According to Carpenter, President Lincoln used the map in his decisions to send his armies to free blacks in some of the highest density areas in order to destabilize Southern order.
Francis Bicknell Carpenter placed the “slave density map” in the lower right corner of his painting of the Emancipation Proclamation.
President Lincoln’s Cottage, now maintained by the National Trust for Historic Preservation, is where President Lincoln developed the Emancipation Proclamation. So it was fitting that, on Lincoln’s birthday this year, NOAA’s Office of Coast Survey presented a copy of the map to Cottage officials, to assist with their vital educational programs.
In the very library where Lincoln may have studied the map, Coast Survey’s Dawn Forsythe (left) and NOAA’s Ben Sherman (right) presented the map to Erin Carlson Mast, the Cottage’s executive director, and Callie Hawkins, associate director for programs.
Dawn Forsythe (Coast Survey), Erin Carlson Mast and Callie Hawkins (Lincoln’s Cottage), and Ben Sherman (NOAA) with the slave density map in the Lincoln Cottage library.
The Cottage plans to use the map in their educational programs. To learn more about the map, see Mapping Slavery in the Nineteenth Century.
The men of Coast Survey created the map to help the public understand the secession crisis, by providing a visual link between secession and slavery.