Deck 15: How to Work With Digital Elevation Models in Arcgis Pro

Question 1

Which of the following is used in digital terrain models to represent elevation?

A) X
B) Y
C) Z
D) E

Answer 1

C

Question 2

Slope is calculated for a digital elevation model by:

A) Using the native value assigned to each grid cell in the National Elevation Dataset
B) Computing the direction of steepest descent from each grid cell
C) Dividing the value for run by the value for rise
D) Multiplying the value for rise by the grid cell resolution

Answer 2

C

Question 3

Which of the following visibility analysis techniques will examine areas 360 degrees around a vantage point?

A) Viewshed
B) Binary Sight
C) Line Of Sight
D) View Rotation

Answer 3

A

Question 4

The grid cell value of a DTM refers to:

A) Vertical Accuracy
B) The Vertical Datum
C) Elevation
D) Bathymetry

Question 5

Draping utilizes which of the following?

A) The Vertical Datum
B) Slope
C) Aspect
D) Base Heights

Question 6

A process in which GIS layers are given elevation values to match the corresponding heights in a digital terrain model is:

A) Breaklining
B) Baselining
C) Draping
D) Sloping

Question 7

Your work in ArcScene is stored in a:

A) Globe document (.gxd file)
B) Scene document (.sxd file)
C) Map document (.mxd file)
D) ArcScene document (.axd file)

Question 8

When computing a hillshade, "altitude" refers to:

A) The position of the light source measured between 0 degrees and 90 degrees
B) The height of the light source above the terrain
C) The position of the light source measured in 0 degrees to 360 degrees in relation to the DEM
D) The direction the shadows generated from the light source, measured between 0 degrees and 360 degrees

Question 9

A common vertical datum for current U.S. elevation data is:

A) VD83
B) GPS95
C) NAD83
D) NAVD88

Question 10

Which of the following resolutions for DEMs is not available in the 3D Elevation Program?

A) 3 arc-seconds
B) 1 arc-second
C) 1/3 arc-second
D) 1/9 arc-second

Question 11

A shaded relief map of the terrain created by modeling the position of an illumination source in relation to the terrain is:

A) Hillshade
B) Shadowmap
C) Surface Aspect
D) NED

Question 12

A histogram of a raster dataset represents a graphical depiction of:

A) The elevation values of each cell of a digital terrain model on the x-axis and the corresponding slope values for each cell on the y-axis
B) The grid cell values on the x-axis and the number of grid cells of those values on the y- axis
C) The slope values of each cell of a digital terrain model on the x-axis and the corresponding slope aspect values for each cell on the y-axis
D) The grid cell values on the x-axis and the corresponding elevation value of each cell on the y- axis.

Question 13

The ability to simulate standing on top of a taller object during visibility analysis refers to which of the following?

A) Observer offset
B) Platforming
C) View elevation
D) 3D View

Question 14

When computing a hillshade, "azimuth" refers to:

A) The position of the light source measured between 0 degrees and 90 degrees
B) The height of the light source above the terrain
C) The position of the light source measured in 0 degrees to 360 degrees in relation to the DEM
D) The direction the shadows generated from the light source, measured between 0 degrees and 360 degrees

Question 15

Which of the following is a property of a digital elevation model (DEM)?

A) Elevation values must be placed an equally spaced distance apart.
B) It can contain grid cells of multiple resolutions in the same dataset.
C) The grid cell resolution cannot be coarser than 10 m.
D) Additional elevation points may be added to the DEM to improve measurements.

Question 16

The cell values in a slope aspect grid represent:

A) The steepness of slope at that cell (measured in degrees)
B) The height of the elevation at that cell
C) The amount of friction at a cell for traveling across it
D) The direction the steepest slope is facing at that cell