What is a datum in real estate?

A horizontal plane from which heights and depths are measured.

What does the term datum refer to?

A datum is a plane, a straight line, or a point that is used as a reference when processing a material or measuring the dimensions of a target. ISO Definition. Types of Datums.

What is Section in real estate?

Measure of land representing one square mile. A section equals 640 acres.

What is an example of a datum?

An example of a datum is a new scientific discovery used to reach a conclusion about the common cold. An example of a datum is the assumed altitude of a specific piece of land used as the basis in calculating the altitude of the top of a mountain on the land.

How do I find my datum?

On a USGS topographic map the datum information is in the fine print at the bottom left of the map. The datum will always be NAD 27. There may be information on how many meters to shift a position to convert it to NAD 83. Think of this as the error that will be introduced if you leave your GPS unit set to WGS 84.

What is township in real estate?

A survey township is simply a geographic reference used to define property location for deeds and grants as surveyed and platted by the General Land Office (GLO). … A survey township is nominally six by six miles square, or 23,040 acres.

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What is a quadrangle in real estate?

In the Government Survey method of describing real property, a square area of land 24 miles square (24 miles on each side or 576 square miles), containing 16 Townships (six miles square) or 576 Sections (one mile square).

What is a parallel in real estate?

properties that are side by side but do not meet. They are in the same direction with a constant distance.

What does a datum look like?

The Earth is shaped like a flattened sphere. This shape is called an ellipsoid. A datum is a model of the earth that is used in mapping. The datum consists of a series of numbers that define the shape and size of the ellipsoid and it’s orientation in space.

Why are there different datums?

Because there are different ways to fit the mathematical model to the surface of the Earth, there are many different datums. Also, in the modern digital era, techniques have vastly improved and many modern datum are very similar to each other.

What datum is Google Maps?

Google Maps and Microsoft Virtual Earth use a Mercator projection based on the World Geodetic System (WGS) 1984 geographic coordinate system (datum). This Mercator projection supports spheres only, unlike the ESRI Mercator implementation, which supports spheres and ellipsoids.

Does Lat Long have a datum?

All lat/longs on all maps would agree. That spheroid, derived from satellite measurements of the Earth, is GRS80, and the datums that match it are NAD83 and WGS84. … In other words, for a point on the Earth’s surface, if one uses a different datum, one calculates a different lat/long value.

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How datum is created over geoid?

A datum is built on top of the selected spheroid and can incorporate local variations in elevation. With the spheroid, the rotation of the ellipse creates a totally smooth surface across the world. Because this doesn’t reflect reality very well, a local datum can incorporate local variations in elevation.