Deck 16: How to Work With Contours, Tins, and 3D Imagery in Arcgis Pro

Question 1

In a Delaunay Triangle:

A) The entire triangle must cover the space of all the points used in the TIN.
B) The triangle must fit inside the space of the Theissen polygon associated with that triangle.
C) A circle can be drawn through the three points making up the triangle and no other points.
D) The three edges of the triangle must always be 60 degrees.

Answer 1

C

Question 2

When calculating slope with a TIN, the slope values are stored at the:

A) Nodes
B) Edges
C) Hull
D) Faces

Answer 2

D

Question 3

In a TIN, what is the boundary around the area of the TIN called?

A) Breakline
B) Round
C) Hull
D) Grid

Answer 3

C

Question 4

In vertical exaggeration:

A) The vertical scale is adjusted while the horizontal scale always remains the same.
B) The horizontal scale is adjusted while the vertical scale remains the same.
C) The horizontal and vertical scales are both adjusted by the same amount.
D) The vertical scale is adjusted by twice the amount that the horizontal scale is adjusted.

Question 5

In a TIN, z-values are stored in the:

A) Faces
B) Edges
C) Hull
D) Nodes

Question 6

When constructing a TIN, Theissen polygons are drawn:

A) Connecting the points
B) Equidistant around the points
C) Around the whole area of all the points
D) To connect three points at a time

Question 7

In a TIN, the direction the steepest slope is facing is represented by:

A) Soft Breaklines
B) Slope Breaklines
C) Slope Aspect
D) Slope

Question 8

The standard for viewing 3D graphics in a Web browser without using a plugin is:

A) Cityengine
B) 3D Web Scene
C) Web3D
D) WebGL

Question 9

A contour interval indicates:

A) The vertical distance between contours on a map
B) The horizontal spacing distance on the map between contours
C) The amount of height on the landscape shown in elevation lines
D) The range of values between the maximum height and minimum height in a topographic map

Question 10

A DRG is:

A) A scanned version of a USGS topo map
B) A digitized version of features on a USGS topo map
C) A remotely sensed image overlaid on a USGS topo map
D) An aerial photo that covers the same area as a USGS topo map

Question 11

A line drawn on a map that connects points of equal elevations is a(n):

A) Elevation line
B) Hypso line
C) Topo line
D) Contour line

Question 12

A TIN is which of the following?

A) A 2-dimensional model of terrain
B) A 2.5-dimensional model of terrain
C) A 3-dimensional model of terrain
D) A 3.5-dimensional model of terrain

Question 13

The z-values from which TINs are constructed are called:

A) Mass points
B) Ground control points
C) Cloud points
D) Break points

Question 14

A US Topo can be downloaded from the National Map in which format?

A) A feature class
B) A feature dataset
C) A shapefile
D) A GeoPDF

Question 15

How can old U.S. topographic maps be used today in ArcGIS?

A) Downloaded at separate individual GeoPDF tiles from EarthExplorer
B) Streamed as a seamless service or package from ArcGIS Online
C) Downloaded as one seamless layer package from the National Map
D) Streamed as individual "on demand" tiles from the cloud services at Geoplatform.gov

Question 16

A TIN is a terrain model formed from:

A) Ellipses
B) Grid cells
C) Metal
D) Triangles

Question 17

A hard breakline in a TIN represents:

A) The direction the steepest slope is facing along that breakline
B) A line used to connect the points of the TIN triangles
C) The boundary of the TIN
D) An area on the surface where lines of the TIN should not cross