section 07 (quiz & script sheets & exercise videos) Flashcards
Is the following statement correct?
“A combination of vectordata and griddata for analysis is not possible.”
(spatial analysis)
(L7-1)
TRUE
The Spatial Analyst is needed to analyse grid data.
List 3 possible actions and 1 that is not possible.
(L7-2)
possible actions:
Calculating grids
Converting grids
Analysis of surfaces (DTM)
NOT possible: Choosing attributes
List 3 types of terrain measurement.
Which terrain measurement has the lowest inaccurary concerning heights?
(spatial analysis)
(L7-3)
DTM 5
DTM 25 = DGK 25
Laserscanning
most accurate concerning heights:
Laserscanning
(inaccurary is about 0.1 m)
Do contour lines have to be implemented in the DTM or can they be generated afterwards?
(spatial analysis)
(L7-4)
Contour lines DO NOT have to be implemented in the DTM.
They CAN be generated afterwards.
Using the contour tool of the Spatial Analyst to generate contour lines, a certain factor can be selected.
Name the factor and describe its purpose.
(L7-5)
The z-factor is used to..
- adjust the z-coordinates to the x,y-coordinates.
- convert the height-coordinates unit to the x,y-coordinates unit.
(Often they are converted into cm because integer is a suitable type for calculations.)
Describe the meaning of “Hillshades”.
L7-6
Hillshades:
Creating a spatial impression to the relative height differences of a terrain.
List (and define) the necessary information for a Hillshade of a DTM.
(L7-7)
Azimuth
The Azimuth declares the direction of a light source that lights a surface (in degrees).
Altitude
The Altitude represents the angle of the light source over the horizon.
Is the following statement correct?
“Every cell in the shadow gets the value “0”
(L7-8)
TRUE
Give the geometric formula to calculate the degree of slope.
L7-9
arctan(height/length)
What information does the data description DGK25 provide?
L7-10
- digital topographic map
- data in scale 1:25.000
