Mapwork Flashcards
What is vertical exaggeration?
The amount by which the vertical scale has been enlarged.
It helps in visualizing terrain features more distinctly.
What is the vertical scale represented by Im = 20?
20 x
This indicates the scale factor used in vertical exaggeration.
What does VS = 1:2000 represent?
The ratio of the vertical scale to the horizontal scale.
It shows how much the vertical dimension is exaggerated compared to the horizontal dimension.
Define intervisibility.
The ability to see one point on a map from another point.
What does gradient refer to in geographical terms?
The steepness of a slope between two points.
What is an aerial photograph?
A photograph taken from above.
Name the types of aerial photographs.
- Vertical Aerial Photograph
- Oblique Aerial Photograph
- High Oblique
- Low Oblique
Fill in the blank: An orthophoto map is a _______.
[vertical aerial photograph].
What type of photograph shows a large area with an uneven scale?
High oblique photograph
The angle of the camera is tilted, allowing the horizon to be seen.
What is a primary advantage of high oblique photographs?
Gives a common view of reality and interesting information can be obtained
This perspective can provide insights into the overall landscape.
What is a disadvantage of high oblique photographs?
Size of features is distorted, scale and distance cannot be calculated, and parts of the background can be hidden by trees and buildings
This can limit the usefulness of the image in certain analyses.
What is a vertical aerial photograph primarily used for?
To compile a topographical map
It is also known as an orthophoto map.
What are the advantages of vertical aerial photographs?
- Scale is uniform
- Accurate measurement
- Objects don’t obscure each other
These features make vertical aerial photographs more reliable for mapping and analysis.
What is a disadvantage of vertical aerial photographs?
- ‘Bird’s-eye view’ isn’t familiar
- Scale is usually small
- Shadows may obscure features
These factors can complicate interpretation and usability.
What is the formula for calculating area in aerial photography?
A = L X B (- x scale)
This formula is essential for determining the area represented in aerial images.
What are the advantages of using aerial photographs in conjunction with maps?
- To update the map
- To see the reality of what’s on the map
Aerial photographs can provide real-world context and current conditions.
What does a darker tone in trees indicate?
Coarse and uneven texture
Trees with a darker tone are typically taller and shorter.
What is the purpose of an avenue of trees?
Wind break
The avenue of trees has a linear pattern and uniform texture.
What pattern characterizes orchards?
Linear uniform pattern with coarse texture
Orchards may show a variety of tones indicating different stages of growth.
What does a dark tone along a tree line suggest?
Dense vegetation
This often corresponds to a wooly or coarse texture with a variety of tree sizes.
What does a smooth, high tone in a river indicate?
The river may be shallow or carrying silt
This visual characteristic can help assess the flow and depth of the river.
What is indicated by a lighter tone and fine uniform texture in grassland?
The presence of grassland
Grasslands typically have a consistent texture and color.
What features are associated with a golf course?
Flatways with light tone and fine texture
Golf courses are designed for aesthetics and playability, reflecting these characteristics.
