What is the meaning of a map?
A graphical representation of information pertaining to the earth’s surface
Maps use symbols and signs and are drawn according to a specific scale.
List ** disadvantages of scale**.
- Consumes time to create
- Requires thorough research
- Needs constant updates
- Can be expensive to create
- Safety concerns during creation
These challenges can impact the effectiveness of map scales.
List and explain types of contour lines.
- Index Lines: Thick lines labeled with elevation
- Intermediate Lines: Thinner lines without labels
- Supplementary Lines: Dotted lines indicating flatter terrain
These lines help in understanding the elevation changes in a landscape.
Define Geographic Information System (GIS).
A system designed to capture, store, manipulate, analyze, manage, and present geographical data
GIS was first known by Rodgers Tom La-son in 1968.
List five advantages of scale.
- Updates recent changes in map distance
- Compares new and old maps
- Educates readers about landmarks
- Guides visitors in unfamiliar areas
- Prevents confusion between landmarks
Scales enhance the usability and accuracy of maps.
Define remote sensing.
Acquiring information from an object at a distance
It provides a global perspective on Earth’s systems.
List the equipment used in Chain Surveying.
- Chain
- Measuring Tape
- Station Pegs
- Ranging Poles
- Offset Staff
- Arrows or Pins
- Field Notebook
These tools are essential for accurate measurements in chain surveying.
What is the relationship between Geographical Information Systems and Remote Sensing?
- Both analyze spatial data
- Both can use computer software
- Both observe beyond human eyesight
- Both cover large areas quickly
They are complementary tools in studying geographical phenomena.
What are conventional signs on a map?
Symbols representing physical and cultural features
They include landmarks like rivers, roads, and vegetation types.
Define map.
A representation of an area showing physical and man-made features
Maps can depict various elements such as topography, landmarks, and routes.
What is satellite remote sensing?
A satellite that studies the Earth’s surface and atmosphere
NASA uses remote sensors on satellites to detect and record energy.
What are the stages of conducting a survey?
- Reconnaissance
- Actual or Secondary Survey
- Presentation
Each stage plays a vital role in ensuring accurate surveying results.
Define Traverse Surveying.
A survey method where a series of straight lines are constructed and bearings and distances are measured
It involves fixing points by reading their bearings relative to one another.
What is a Closed Traverse?
A traverse connecting two stations whose positions are known
Commonly used in surveying lakes and building blocks.
What is an Open Traverse?
A series of connected straight lines whose lengths and bearings are measured
Used to survey rivers, roads, and railway routes.
What is map reading?
The act of interpreting or understanding the geographic information portrayed on a map
Essential for deriving information such as distance, direction, and features.
List the components of Geographic Information System (GIS).
- Hardware
- Software
- Data
- People
Each component plays a crucial role in the functionality of GIS.
What are the advantages of Chain Surveying?
- Suitable for flat surfaces
- Easy and quick to read
- Suitable for clear areas
- Easily repaired in the field
- Simple instruments used
These advantages make chain surveying a practical choice for small areas.
Define map scale.
The ratio of map distance to actual ground distance
It helps in understanding the relationship between distances on the map and real-world distances.
Define Geodetic Surveys.
Surveys that take into consideration the shape of the earth
This type of survey is essential for accurate mapping on a global scale.
List the importance of land surveying.
- Determines area of a place
- Sets ground for construction
- Produces maps
- Represents features on maps
- Basis for feasibility studies
- Provides land security for loans
These points highlight the critical role of surveying in various fields.
State and explain five relief features of contour lines on a map.
- Cliff: Steep rock face
- Spit: Accumulated beach materials attached to land
- Delta: Landform at river mouth
- Lagoon: Shallow body of water separated from a larger body
- Valley: Low area between hills
These features indicate variations in elevation and terrain.
State and explain relief features of contour lines on a map.
- Valleys: Represented by v-shaped lines
- Gentle Slope: Lines spaced far apart
- Steep Slope: Lines close together
- Isolated Hill: Stands apart from others
- Ridge: Elongated highland with parallel lines
These features illustrate the variations in terrain on a map.
What is the average gradient of a slope expressed as?
Ratio between height and length of the ground
The formula for calculating gradient is: Gradient = Difference in height (metre) / Horizontal Distance (metre).
