Where can I find survey Benchmarks?
Most survey marks were set by the U.S. Coast & Geodetic Survey (now called the National Geodetic Survey); information for those marks is available online. For further assistance, contact the National Geodetic Survey at 301-713-3242 or [email protected].
What are Benchmarks in GIS?
Benchmarks are a type of survey markers whose elevations have been surveyed as accurately as possible based on the technology at the time. Surveyors and GIS professionals use survey markers for groundtruthing in order to verify the positional and vertical accuracy of geographic data.
Is Coast and Geodetic Survey?
The National Geodetic Survey, our Nation’s first civilian scientific agency, was established by President Thomas Jefferson in 1807 as the Survey of the Coast. Its mission was, and still is, to survey the U.S. coastline and create nautical charts of the coast to help increase maritime safety.
What is USC&GS datum?
In general whenever anyone references the “USC&GS” or even the “USGS” datum they are referring to NGVD 29 for the vertical and NAD 27 for the horizontal.
Who founded the Survey of the Coast?
Hassler devised a system in which the line of zero longitude of the nation ran through the great middle port of New York. Thus began, two centuries ago this spring, the nation’s first Survey of the Coast, headed by Hassler, a young Swiss immigrant personally chosen for the job by President Thomas Jefferson.
Where can I find information about survey marks in NGS?
NGS provides Information about survey marks (including bench marks) in text datasheets or in GIS shapefiles. Note some survey markers installed by other organizations may not be available through NGS.
Is the NGS the only organization that creates benchmarks?
The NGS is not the only organization that creates and uses benchmarks and other types of control markers. In order for any mark to get “in the database” they must be “bluebooked”, which can take a lot of time and effort and is often not done to save money.
Where can I find information about survey marks (including bench marks)?
NGS provides Information about survey marks (including bench marks) in text datasheets or in GIS shapefiles. Note some survey markers installed by other organizations may not be available through NGS. To learn more about survey marks, visit our Frequently Asked Questions (FAQs).
How can I find Survey benchmark and triangulation station information?
How can I find survey benchmark and triangulation station information? Most survey marks were set by the U.S. Coast & Geodetic Survey (now called the National Geodetic Survey); information for those marks is available online. For further assistance, contact the National Geodetic Survey at 301-713-3242 or [email protected].