Land surveying regulations and standards

Land Surveying Regulations and Standards: Key Terms and Vocabulary

In the Professional Certificate in Topographic Surveying, students will encounter a variety of regulations and standards that govern the practice of land surveying. These rules ensure that land surveyors perform their work with a high degree of accuracy, consistency, and professionalism. This explanation will cover key terms and vocabulary related to land surveying regulations and standards.

1. Accuracy

Accuracy is the degree to which a measured value agrees with the true value. In land surveying, accuracy is crucial to ensure that measurements are reliable and can be used for various purposes, such as property boundary determination, land development, and engineering design. Accuracy is often expressed as a tolerance, which is the maximum allowable difference between the measured value and the true value.

Example: A land surveyor measures a property boundary with an accuracy of ±2 centimeters.

2. American Land Title Association (ALTA)

ALTA is a trade association that represents the land title insurance industry in the United States. ALTA has developed standards for land title surveys that are widely accepted and used in commercial real estate transactions. These standards provide a uniform minimum set of requirements for land title surveys, ensuring that they are consistent and reliable.

Example: A commercial real estate developer requests an ALTA survey to ensure that the property boundaries and improvements are accurately depicted.

3. American Congress on Surveying and Mapping (ACSM)

ACSM is a professional organization that represents land surveyors and other geospatial professionals in the United States. ACSM has developed standards for various types of surveys, including boundary surveys, topographic surveys, and control surveys. These standards provide guidelines for surveyors to follow, ensuring that their work meets a high level of quality and consistency.

Example: A land surveyor follows ACSM standards for a boundary survey to ensure that it meets the minimum requirements for accuracy and detail.

4. Boundary Survey

A boundary survey is a type of land survey that determines the location of property boundaries. It involves the measurement of existing monuments, corners, and property lines, as well as the research of legal records and deeds. The result of a boundary survey is a plat or map that shows the location of the property boundaries and any improvements within the property.

Example: A homeowner hires a land surveyor to perform a boundary survey to determine the location of their property line.

5. Control Survey

A control survey is a type of land survey that establishes precise horizontal and vertical control points for use in other surveys. It involves the measurement of known points with high accuracy, such as benchmarks or control monuments, and the calculation of their coordinates and elevations. The result of a control survey is a set of control points that can be used to accurately locate other features in the area.

Example: A civil engineer uses control points established by a control survey to accurately locate the elevations of a proposed roadway.

6. Easement

An easement is a legal right to use someone else's property for a specific purpose. In land surveying, easements are often depicted on surveys to show the location and extent of the easement area. Common types of easements include utility easements, access easements, and drainage easements.

Example: A land surveyor shows a utility easement on a survey to indicate that the utility company has the right to access the property to maintain its equipment.

7. Errors of Closure

Errors of closure are the differences between the sum of the measured angles or distances in a survey and the theoretical sum. These errors can be caused by various factors, such as measurement errors, instrument errors, or environmental conditions. Errors of closure are used to evaluate the accuracy of a survey and to identify any potential issues or inconsistencies.

Example: A land surveyor calculates the errors of closure for a boundary survey and finds that the differences are within the acceptable tolerance.

8. Geodetic Control Network

A geodetic control network is a network of precisely located points on the Earth's surface that are used to define a coordinate system. These points are often established by government agencies or other organizations and are used as references for various types of surveys and mapping projects.

Example: A land surveyor uses a geodetic control network to accurately locate a property boundary in a large-scale mapping project.

9. Horizontal and Vertical Control

Horizontal and vertical control refer to the precise location of points in two-dimensional and three-dimensional space, respectively. Horizontal control is used to locate points on a horizontal plane, while vertical control is used to determine their elevations.

Example: A land surveyor establishes horizontal and vertical control points for a topographic survey to ensure that the elevations and locations of the features are accurately depicted.

10. Legal Description

A legal description is a written description of a property that is used in legal documents, such as deeds or contracts. It typically includes the size, shape, and location of the property, as well as any easements or encumbrances. Legal descriptions are often based on surveys and are used to accurately identify the property.

Example: A land surveyor provides a legal description of a property based on a boundary survey, including the property lines, dimensions, and any easements or encumbrances.

11. Monuments

Monuments are physical markers that are used to identify property boundaries or other features on the ground. They can be natural or artificial and can take various forms, such as iron pins, concrete markers, or stone pillars. Monuments are often placed during a survey and are used to accurately locate the features in the future.

Example: A land surveyor places an iron pin at the corner of a property as a monument to mark the location of the boundary.

12. National Standard for Spatial Data Accuracy (NSSDA)

The NSSDA is a set of standards for the accuracy of spatial data in the United States. It provides guidelines for the measurement and evaluation of the accuracy of various types of spatial data, such as maps, aerial photographs, and surveys. The NSSDA is used to ensure that spatial data is reliable and consistent.

Example: A land surveyor follows the NSSDA standards to evaluate the accuracy of a topographic survey and to ensure that it meets the minimum requirements.

13. Plat

A plat is a map or plan that shows the location and boundaries of a property. It typically includes the dimensions, shapes, and locations of the features within the property, such as buildings, roads, and easements. Plats are often prepared by land surveyors and are used in various applications, such as property transfers, zoning applications, and engineering design.

Example: A land surveyor prepares a plat of a property based on a boundary survey to show the location and extent of the property.

14. Topographic Survey

A topographic survey is a type of land survey that depicts the natural and artificial features of a property, as well as their elevations. It involves the measurement of the terrain, buildings, trees, and other features, as well as the calculation of their elevations. The result of a topographic survey is a contour map that shows the shape and relief of the land.

Example: A civil engineer uses a topographic survey to design a stormwater management system for a property.

15. Zoning

Zoning is the regulation of land use by local governments. It involves the division of a jurisdiction into zones or districts, each with its own set of regulations and restrictions. Zoning can affect the location, size, and type of buildings and other improvements that can be made on a property. Land surveyors often work with zoning officials to ensure that their work complies with the local zoning regulations.

Example: A land surveyor prepares a survey of a property to determine whether it complies with the local zoning regulations for setbacks and building height.

In conclusion, land surveying regulations and standards play a critical role in ensuring that land surveys are accurate, consistent, and reliable. By understanding the key terms and vocabulary related to these regulations and standards, students in the Professional Certificate in Topographic Surveying can perform their work with confidence and professionalism. Whether they are conducting a boundary survey, a topographic survey, or a control survey, they can use these regulations and standards as guidelines to ensure that their work meets the highest level of quality and accuracy.