Map Work Flashcards
What are spot heights?
Small dot next to num in metrres above sea level
What is trigonometrical beacons?
Measurements of height and distance 🔼
What is countours?
Close together - steep
Far apart- gentle
How do you work out distance?
Distance on map x scale bar / 100000
Area?
Actual distance using formula for length x distance formula for breadth =km squared
Where is aerial photography taken from?
Aircraft
What are the advantage of aircraft photography?
Supplement info by detail and easier to obtain and compare
What are different types of aerial photog?
Vertical (90*) and oblique
What are the advantages of vertical aerial ?
Accurate, scale is same, clearly shown buildings ect.
What are the disadvantages of vertical aerial photog?
Detail obscured by shadows
Too much detail
What are the two types of oblique aerial photo?
High
Low
What are the advantages of oblique?
Show large areas
Easy and recognizable
Disadvantages of oblique?
Distorted
Distances cannot be calculated
Features hiddem
What is orthophoto?
Combination of vertical and typographical
Contains streets ect.
Advantages of orthophoto?
Cheap
Bigger scale
More detailed
