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In theUnited States, aplat (/plæt/^[1] or/plɑːt/)^[2] (plan) is acadastral map, drawn to scale, showing the divisions of a piece of land.United States General Land Office surveyors drafted township plats ofPublic Lands Surveys to show the distance and bearing between section corners, sometimes including topographic or vegetation information. City, town or village plats show subdivisions broken intoblocks with streets and alleys. Further refinement often splits blocks into individuallots, usually for the purpose of selling the described lots; this has become known assubdivision.

After the filing of a plat,legal descriptions can refer to block and lot-numbers rather than portions ofsections.^[3] In order for plats to become legally valid, a local governing body, such as apublic works department,urban planning commission,zoning board, or another organ of the state must normally review and approve them.

The creation of a plat map marks an important step in the process ofincorporating atown orcity according toUnited States law. Because the process of incorporation sometimes occurred at acourthouse, the incorporation papers for many American cities may be stored hundreds of miles away in anotherstate. For example, to view the originalUnited States General Land Office plat for the city ofSan Francisco, California, filed in 1849, one must visit the Museum of the Oregon Territory inOregon City, Oregon, as at that time Oregon City was the site of the closest federal land office to San Francisco.^[4]

Aplat of consolidation orplan of consolidation originates when alandowner takes over several adjacentparcels of land and consolidates them into a single parcel. In order to do this, the landowner will usually need to make asurvey of the parcels and submit the survey to the governing body that would have to approve the consolidation.^[5]

Aplat of subdivision orplan of subdivision appears when a landowner or municipality divides land into smaller parcels. If a landowner owns anacre of land, for instance, and wants to divide it into three pieces, a surveyor would have to take precise measurements of the land and submit the survey to the governing body, which would then have to approve it.^[6] A plat of subdivision also applies when a landowner/building owner divides a multi-family building into multiple units. This can apply for the intention of selling off the individual units as condominiums to individual owners.^{[citation needed]}

Acorrection plat oramending plat records minor corrections to an existing plat, such as correcting asurveying mistake or ascrivener's error. Such plats can sometimes serve to relocate lot-lines or other features, but laws usually tightly restrict such use.^[7]

Avacating plat functions to legally void a prior plat or portion of a plat. The rules normally allow such plats only when all the platted lots remain unsold and no construction of buildings or public improvements has taken place.^{[citation needed]}

Other names associated with parcel maps are: land maps, tax maps, real estate maps, landowner maps, lot and block survey system and land survey maps. Parcel maps, unlike any other public real estate record, have no federal, state or municipal oversight with their development.^{[citation needed]}

• Subdivision of a property into multiple smaller lots, as described above.^[8]
• Designation ofroads or otherrights of way.
• Ensuring that all property has access to a public right of way. Without such access, a property owner may be unable to use his or her property without having totrespass to reach it. The platting process restricts thefraudulent practice of knowingly selling lots with no access to public right of way without revealing that such access does not exist. (Property that does not have access to public right of way may be sold, provided that the buyer is aware of the lack of a public means of access by water or land.)
• Creation or vacation ofeasements.
• Dedication of land for other public uses, such asparks or areas needed forflood protection.
• Ensuring compliance withzoning. Zoning regulations frequently contain restrictions that govern lot sizes and lot geometry. The platting process allows the governing authorities to ensure that all lots comply with these regulations.
• Ensuring compliance with aland use plan established to control the development of acity.
• Ensuring that all property has access topublic utilities.

Plats contain a number of informational elements:

• The property boundaries are indicated by bearing and distance. The bearing is in the format ofdegrees, minutes, seconds with compass point letters before and afterward to indicate the compass quadrant. For example,N 38 00 00 E is 38 degrees into the northeast quadrant or 38 degrees east ofnorth. Similarly,S 22 00 00 W is 22 degrees west of south.North here is true north, so magnetic orientation must be corrected formagnetic declination.
• The certification note provides information on the surveyor and is the location where recent US plats place the flood survey code in accordance with theNational Flood Insurance Act of 1968.
• Thenorth arrow is familiar to most map readers
• The title block and lot numbers provide information specific to a development orland use plan
• Aneasement is usually indicated by a dashed line, although it is also common to have to look them up in supplementary documents (such as a title report)
• Streets are usually indicated by a graphical outline of theright of way; the outline also sometimes depicts the paved area.

• Site plan
• Lot and block survey system
• Plat of Zion

The dictionary definition ofplat at Wiktionary

Media related toSurvey drawings at Wikimedia Commons

• The U.S. National Archives and Records Administration

• Geography of the United States
• Land surveying systems
• Map types

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