Podcast
Questions and Answers
What is one of the primary uses of remote sensing in archeology?
What is one of the primary uses of remote sensing in archeology?
Which of the following is NOT a characteristic of contours?
Which of the following is NOT a characteristic of contours?
What does the term 'horizontal equivalent' refer to in contour mapping?
What does the term 'horizontal equivalent' refer to in contour mapping?
Which method is commonly used for calculating areas in surveying?
Which method is commonly used for calculating areas in surveying?
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What does the contour interval indicate in a contour map?
What does the contour interval indicate in a contour map?
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How does the contour interval relate to the scale of a map?
How does the contour interval relate to the scale of a map?
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What is the term for the horizontal distance between two consecutive contours?
What is the term for the horizontal distance between two consecutive contours?
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Which instrument is primarily used to locate contour gradients?
Which instrument is primarily used to locate contour gradients?
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Which statement is true regarding contour lines?
Which statement is true regarding contour lines?
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What can be computed approximately using contour maps?
What can be computed approximately using contour maps?
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What method involves the use of horizontal and vertical measurements for drawing contours?
What method involves the use of horizontal and vertical measurements for drawing contours?
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Which of the following is NOT a use of contour maps?
Which of the following is NOT a use of contour maps?
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Steep ground is indicated by contour lines that are:
Steep ground is indicated by contour lines that are:
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What does a topographical map represent?
What does a topographical map represent?
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Which method is considered the best for representing elevations on a map?
Which method is considered the best for representing elevations on a map?
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What is a contour line?
What is a contour line?
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What is a contour interval?
What is a contour interval?
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For which type of terrain should a larger contour interval be used?
For which type of terrain should a larger contour interval be used?
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What happens if a small contour interval is adopted on a rough hilly ground?
What happens if a small contour interval is adopted on a rough hilly ground?
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Which of the following features are NOT typically shown in topographical maps?
Which of the following features are NOT typically shown in topographical maps?
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Why is it important to maintain a constant contour interval in a contour plan?
Why is it important to maintain a constant contour interval in a contour plan?
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What is a primary characteristic of the Method of Squares?
What is a primary characteristic of the Method of Squares?
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The Method of Cross Sections is most suitable for which of the following?
The Method of Cross Sections is most suitable for which of the following?
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Which formula can be used to calculate the area of a triangle if the lengths of the sides are known?
Which formula can be used to calculate the area of a triangle if the lengths of the sides are known?
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What is the purpose of the Average Ordinate Rule when determining areas?
What is the purpose of the Average Ordinate Rule when determining areas?
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Which method is NOT part of the process for calculating areas based on field measurements?
Which method is NOT part of the process for calculating areas based on field measurements?
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In tacheometric methods, what is the role of traverse stations?
In tacheometric methods, what is the role of traverse stations?
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The formula for calculating the area using the Trapezoidal Rule primarily emphasizes which aspect?
The formula for calculating the area using the Trapezoidal Rule primarily emphasizes which aspect?
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What does the variable 'd' represent in the area calculation formulas?
What does the variable 'd' represent in the area calculation formulas?
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What is the formula for calculating the area using the Trapezoidal Rule?
What is the formula for calculating the area using the Trapezoidal Rule?
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Which rule is stated to be more accurate in the content provided?
Which rule is stated to be more accurate in the content provided?
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What is the area calculation formula for the Prismoidal Formula?
What is the area calculation formula for the Prismoidal Formula?
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Which of the following is NOT an application of Remote Sensing?
Which of the following is NOT an application of Remote Sensing?
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What kind of data is typically collected in Remote Sensing?
What kind of data is typically collected in Remote Sensing?
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In the Simpson’s Rule formula, what factor is multiplied by the sum of odd ordinates?
In the Simpson’s Rule formula, what factor is multiplied by the sum of odd ordinates?
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What does $D$ represent in the context of the volume calculation formulas?
What does $D$ represent in the context of the volume calculation formulas?
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What element is NOT part of the area calculation in the trapezoidal formula?
What element is NOT part of the area calculation in the trapezoidal formula?
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Study Notes
Unit III: Mapping & Sensing
- Mapping & Sensing: Includes contour lines and remote sensing
- Relative Positions: Points on a map are represented by relative positions
- Importance: Mapping importance increases when relative heights of features are represented along with horizontal positions
- Topographical Maps: Show ground features like rivers, ponds, valleys, slopes, depressions, roads, railways, vegetation, etc.
- Symbolic Notations: Used in topographical surveys for horizontal and vertical controls
Contour Lines
- Definition: Imaginary lines connecting points with the same elevation
- Best Method: Representing elevations on topographical maps
- Contour Interval: Vertical distance between consecutive contours
- Constant Interval: Keeps the plan consistent
- Map Appearance: Proper contour interval choice is crucial for clear visual representation
- Considerations: The choice of a suitable contour interval depends factors such as ground roughness, map scale, and intended use.
Methods of Contouring
- Direct Method: Measures horizontal and vertical distances to determine elevation points and connect them to form contours
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Indirect Method:
- Method of Squares: The area is gridded into squares, the reduced levels of corners are determined, and contours are drawn by interpolation
- Method of Cross-Sections: A traverse is run, cross-sections are projected, and levels are determined at various points. Contours are then interpolated
- Tacheometric Methods: A network of radial lines is drawn, observations from traverse stations are made, and elevations and distances are calculated.
Computations of Areas
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Methods:
- Dividing into Triangles/Squares: Calculate areas based on triangles or squares that divide the area within the boundary
- Planimeter: Instruments/tools are used to measure the irregular area
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Areas by Offsets (from base line): Methods based on measurements from a baseline:
- Ordinate Rule
- Average Ordinate Rule
- Trapezoidal Rule
- Simpson's Rule
Volumes
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Formulas: Calculate volumes for different shaped areas
- Trapezoidal Formula
- Prismoidal Formula/Simpson's Rule
Remote Sensing
- Definition: Collecting and interpreting information about a target without physical contact
- Methods/Techniques: Aircraft, satellites, cameras, scanners, and radar
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Applications:
- Environmental: Weather forecasting, pollution monitoring, and global warming
- Mineral Exploration: Locating and mapping mineral deposits
- Hazard Identification: Detecting natural hazards
- Archaeology: Identifying and mapping prehistoric sites
- Information Collection: High sophisticated sensing devices (e.g., sensors, cameras, etc.) used for data gathering
Characteristics of Contours
- Contours of Different Elevations: Contours do not intersect except for cliffs
- Steep Slopes: Closely spaced contours indicate steep slopes
- Gentle Slopes: Widely spaced contours represent gentle slopes
- Valley/Ridge Lines: Contours cross valley/ridge lines at right angles
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Description
Explore the concepts of mapping and sensing in this quiz focusing on contour lines and topographical maps. Understand the importance of relative positions and how they relate to real-world features. Test your knowledge on symbolic notations and the significance of contour intervals in mapping.
