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Principles of GIS Final Quizzes
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Gravity
Terms in this set (23)
If TIN is derived from DEM, then TIN can't be as accurate as the full DEM. T/F
TRUE
A ________________ is an area surrounded by higher elevations values in a DEM.
Sink
Aspect is measured in
degree Azimith
A global error in DEM can be corrected by
Georetification
If you are selecting a site for a wildlife lookout station in a national park, which terrain analysis will you use to find the area that can be seen from the lookout station?
viewshed
Relative error in a DEM can be corrected by
Filling the DEM
The algorithm used to calculate slope in ArcGIS is Horn algorithm. T/F
true
The primary input data in a terrain analysis is the Digital Elevation Model. T/F
true
A _____ is a pixel surrounded by pixels with lower elevation values in a DEM.
Spike
When defining a stream network, if you define a threshold value of say for ex. 1000, this means_________
Each cell of the network has a min of 1000 contributing cell
Watershed area of the Mississippi river is an example for a point-based watershed.
False
_____ should be the input file used in the tool to calculate the Flow Direction
Filled DEM
Which spatial statistics computes a Z score for every point in the data set?
Hospot analysis
In an IDW interpolation technique, estimated values are always between max and min values of known points
True
Which spatial interpolation method assumes that any point within the Voronoi polygon is closer to the polygon's known point than any other known points?
Thiessen Polygon
Everything is related to everything else, but near things are more related than far things. This is
The first law of geography
In ____________ interpolation technique, all the points in the data are used to estimate the values for locations for which data is unavailable?
Global
In spatial data, if near by or neighboring areas are alike, it is called
Positive spatial autocorrelation
Thiessen Interpolation is an inexact interpolation technique
true
A moran's I of 0.94 and a p value of 0.00000 indicate that there is no significant spatial autocorrelation in the data. T/F
false
Which of the following analysis is a Global statistic and indicates a cluster of high values or low values in the data?
G statistics
Which spatial statistic computes a Z score for every point in the data set?
Hotspot analysis
Lisa is a global pattern analysis. T/F
False
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