Survey Calculations & Coordinate Systems Flashcards
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Read the first 9 Survey Calculations & Coordinate Systems flashcards as text
What is the purpose of a traverse adjustment?
Answer: To correct for angular and distance errors
Traverse adjustment is a mathematical procedure applied to survey data collected from a traverse (especially a closed traverse) to distribute accumulated errors. This process ensures that the traverse closes geometrically and that the coordinates of all points are consistent. It improves the overall accuracy and precision of the survey.
Which unit is typically used for angular measurements in surveying?
Answer: Degrees
In surveying, angles are most commonly measured and expressed in degrees, minutes, and seconds (DMS). This system provides a precise and universally understood method for defining directions and orientations. While radians and gradians exist, degrees are the standard for practical survey applications.
What does the bearing N45°E indicate?
Answer: 45 degrees east of north
A bearing is a direction expressed as an angle relative to either North or South. N45°E means starting from North and rotating 45 degrees towards East. This notation clearly defines the quadrant and the specific angle within that quadrant, providing a precise directional reference.
What does 'azimuth' refer to in surveying?
Answer: A clockwise angle from north
Azimuth is a horizontal angle measured clockwise from a reference meridian, typically true North. It ranges from 0° to 360° and provides a unique and unambiguous direction for any line. Azimuths are widely used in surveying for defining directions and calculating coordinates.
What does a coordinate system help establish in land surveying?
Answer: Precise spatial locations
A coordinate system provides a framework for defining the precise spatial location of points on the Earth's surface using numerical values (e.g., Northing and Easting). This allows surveyors to accurately map, measure, and represent land features in a consistent and repeatable manner. It is fundamental for geospatial data integration.
Which coordinate system is widely used in the United States?
Answer: SPCS
The State Plane Coordinate System (SPCS) is a set of 124 geographic coordinate systems designed for specific states and territories in the United States. It provides highly accurate, low-distortion coordinates for local and regional surveying and mapping projects. SPCS is widely adopted for its precision and ease of use within specific state boundaries.
What does NAD83 stand for?
Answer: North American Datum 1983
NAD83 stands for North American Datum 1983, which is a horizontal control datum defined for the United States, Canada, Mexico, and Central America. It serves as the reference framework for latitude and longitude coordinates. NAD83 is crucial for ensuring consistency and accuracy in geospatial data across the continent.
What is a common method to calculate area in surveying?
Answer: Coordinate method
The coordinate method (also known as the Double Meridian Distance or DMD method, or simply using polygon coordinates) is a common and accurate technique for calculating the area of a parcel of land. It uses the X and Y coordinates of the vertices of the polygon. This method is particularly efficient when coordinates are already established from a traverse or GPS survey.
What is a key benefit of using digital coordinate systems?
Answer: They allow integration of precise geospatial data
Digital coordinate systems enable the seamless integration of various types of precise geospatial data from different sources, such as GPS, GIS, and CAD. This interoperability allows for comprehensive analysis, mapping, and management of spatial information. It facilitates collaboration and enhances the accuracy of large-scale projects.