Mixed Deck — All PS Topics Flashcards

In traverse computation, the term 'departure' specifically refers to:

Answer: The east-west component of a course (positive east, negative west)

Departure is the horizontal east-west component of a traverse course; latitude is the north-south component.

A geodetic survey finds a height difference of +2.352 m between two benchmarks using spirit leveling. This is best described as a difference in:

Answer: Orthometric heights

Spirit leveling directly determines orthometric height differences referenced to the geoid (gravity field), not ellipsoidal heights.

What type of map projection preserves the shape of small areas but distorts area over large regions?

Answer: Conformal projection

Conformal projections preserve local angles and shapes, but they distort area as distance from the central meridian increases.

A closed traverse has ΣLat = +0.42 ft and ΣDep = −0.31 ft. What is the linear error of closure (LEC)?

Answer: 0.52 ft

LEC = √(0.42² + 0.31²) = √(0.1764 + 0.0961) = √0.2725 ≈ 0.52 ft.

What is the primary ethical obligation of a PS professional when a conflict of interest arises during geodetic datums & coordinate systems activities?

Answer: Disclose the conflict to all relevant parties and recuse from the decision if necessary

The primary ethical obligation when a conflict of interest arises in geodetic datums & coordinate systems is to disclose it to all relevant parties and, if necessary, recuse from the decision. This maintains professional integrity and stakeholder trust.

What is the primary ethical obligation of a PS professional when a conflict of interest arises during boundary law & riparian rights activities?

Answer: Disclose the conflict to all relevant parties and recuse from the decision if necessary

The primary ethical obligation when a conflict of interest arises in boundary law & riparian rights is to disclose it to all relevant parties and, if necessary, recuse from the decision. This maintains professional integrity and stakeholder trust.

Relief displacement in an aerial photograph causes elevated objects to appear:

Answer: Displaced radially outward from the principal point

Relief displacement shifts elevated objects radially outward from the principal point—the greater the object's height and distance from photo center, the more pronounced the outward displacement.

A traverse's DMD area computation yields Σ(Lat × DMD) = +84,620 sq ft. What is the enclosed area in acres?

Answer: 0.971 acres (42,310 sq ft)

Area = |Σ(Lat × DMD)| / 2 = 84,620 / 2 = 42,310 sq ft; converting: 42,310 / 43,560 ≈ 0.971 acres.

How does digital leveling improve surveying?

Answer: It reduces the risk of human error and provides precise elevation data

Digital leveling instruments automate the reading and recording of staff readings, significantly reducing the potential for human transcription errors and misreadings common with optical levels. They provide highly precise elevation data, often with internal data logging and error checking capabilities. This leads to more accurate and reliable vertical control for projects, enhancing the overall quality and efficiency of elevation surveys.

In a two-peg test for a dumpy level, the instrument is found to have a collimation error. The correct adjustment is made so that the line of collimation is:

Answer: Horizontal when the bubble is centered

The line of collimation must be truly horizontal when the instrument is leveled (bubble centered), which is what the two-peg test verifies and corrects.

Three-wire leveling improves precision by:

Answer: Reading top, middle, and bottom stadia crosshairs to average the rod reading and detect errors

Three-wire leveling reads all three horizontal crosshairs; the mean of the top and bottom wires should match the center wire, providing a check.

What is the significance of markers in land boundary determination?

Answer: To clearly mark the edges of a property

Markers, such as iron pins, concrete monuments, or blazed trees, are physical objects placed by surveyors on the ground to indicate the precise corners and sometimes intermediate points of a property boundary. Their significance lies in providing a clear, visible, and permanent physical representation of the legally established property lines. This helps property owners and neighbors easily identify where one property ends and another begins.

When using the Transit Rule to balance a traverse, the correction applied to the latitude of a course is proportional to:

Answer: The absolute value of that course's latitude divided by the sum of all absolute latitudes

The Transit Rule weights latitude corrections by each course's absolute latitude relative to the total sum of absolute latitudes.

For bridge pier layout, which technique is most reliable for establishing pier centerlines over water?

Answer: Intersection from two shore control points using total station

Intersecting lines of sight from two shore-based control points using a total station provides precise pier centerline location over water without direct access.

What is the main advantage of using a total station in surveying?

Answer: It measures both angles and distances accurately

The main advantage of a total station is its ability to perform two critical surveying functions simultaneously and accurately: measuring horizontal and vertical angles, and measuring distances. This integration streamlines fieldwork, reduces setup time, and minimizes potential errors compared to using separate instruments for each measurement. It is a highly versatile and efficient tool for a wide range of surveying tasks, from boundary surveys to construction layout.

The State Plane Coordinate System (SPCS) uses which two map projections depending on the orientation of the state?

Answer: Lambert Conformal Conic and Transverse Mercator

SPCS uses the Lambert Conformal Conic for east-west-oriented states and the Transverse Mercator for north-south-oriented states.

LiDAR (Light Detection and Ranging) determines distances by:

Answer: Recording the two-way travel time of emitted laser pulses and their returns

LiDAR emits laser pulses and precisely measures the round-trip travel time; multiplying by the speed of light and dividing by two gives the distance to the reflecting surface.

In the context of professional liability & ethics, what role does continuous professional development play for PS practitioners?

Answer: It ensures practitioners remain current with evolving standards, technologies, and best practices

Continuous professional development is essential in professional liability & ethics because it ensures PS practitioners remain current with evolving standards, technologies, and best practices, maintaining competency throughout their careers.

In a PLSS section, what is the legal description of the parcel in the northwest corner that is half of a quarter section?

Answer: W½ NW¼

The W½ NW¼ describes a strip running the full north-south length of the NW quarter, comprising the western half of that quarter and lying in the northwest corner of the section.

Which quality assurance method is most commonly applied in boundary law & riparian rights to verify that PS professional standards are being met?

Answer: Structured audits, peer reviews, and performance metrics aligned with industry benchmarks

Structured audits, peer reviews, and performance metrics aligned with industry benchmarks are the most effective quality assurance methods in boundary law & riparian rights, providing objective, measurable evidence that PS standards are consistently met.