 |
 |
to fill out a simple form to connect to Real Estate Agents in your area.
|
If you have a flair for writing, you may also post an article by clicking on Post Article. We will review your article and publish it if we find the contents relevant to this website. The article should be penned by you. It should not have been copied from any other site.
|
|
|
|
Benchmark (surveying)Posted on:3/29/2006
| A benchmark is a point of reference for a measurement. In surveying a benchmark is a geodetic control point set by a surveyor to mark a point of known vertical elevation. |
A benchmark is a point of reference for a measurement. In surveying a benchmark is a geodetic control point set by a surveyor to mark a point of known vertical elevation. These marks may be chiseled into a wall or they may be small brass or aluminium disks, concrete posts, iron pins or bolts that are permanently attached to a stable foundation. In all cases the mark is used by subsequent surveyors to establish the elevation of nearby points. The height of a benchmark is calculated relative to the heights of nearby benchmarks in a network extending to a fundamental benchmark (often at a point designated as the mean sea level of the county in question).
The term benchmark originates from the chiseled horizontal marks that surveyors made into which an angle-iron could be placed to bracket (bench) a levelling rod, thus ensuring that the levelling rod can be accurately repositioned in the same place in the future. These marks were usually highlighted with a chiseled arrow below the horizontal line.
All text is available under the terms of the GNU Free Documentation License (see Copyrights for details).
Real Estate Agents
Show All articles
|
| |
to fill out a simple form to connect to Real Estate Agents in your area.
|
|