GIS Exam 1 Questions with Verified
Solutions
GIS Definition - ANSWER-A computer-based system to aid in the collection,
maintenance, storage, analysis, output and distribution of spatial data and information
Variables of Map Projection Theory (4) - ANSWER-1. Projection surface
2. Light source location
3. Case
4. Aspect
Developable surface - ANSWER-A surface that can be flattened to form a plane without
compressing or stretching any part of it
Non-developable surface - ANSWER-?
Vector file formats (2) [TQ] - ANSWER-Coverages and shape files
Which data model is best suited for representing continuous spatial variables? [TQ] -
ANSWER-Raster
Which data model uses points, lines and polygons to represent real world phenomena?
[TQ] - ANSWER-Vector
Vertices and nodes [TQ] - ANSWER-Vertices are the intermediates of a line point
Planar topology is an example of topological constraint. When enforced, it requires that
all features in a layer occur in a 2-dimensional surface. (T/F) [TQ] - ANSWER-True
If a dangle length was set at 10m, a line segment that was 9m in length would be in
violation of this topological constraint. (T/F) [TQ] - ANSWER-False
Is it possible to convert a layer from one data model to another. (T/F) [TQ] - ANSWER-
True
In a DEM, what do the values represent in each cell? [TQ] - ANSWER-Elevation
Generally speaking, with a raster dataset, there is a many-to-one relationship between
cells and records in the attribute table (T/F) [TQ] - ANSWER-True
, What raster layers can you access/view the attribute table? [TQ] - ANSWER-Integer
based raster layers
As the resolution of a raster dataset increases, within cell variation... [TQ] - ANSWER-
Decreases
In an attribute table, a row is called a ... [TQ] - ANSWER-Record
In an attribute table, a column is called a ... [TQ] - ANSWER-Field
"Small", "Medium" and "Large" are examples of what type of attribute data? [TQ] -
ANSWER-Ordinal
A geoid is ... [TQ] - ANSWER-The hypothetical surface of the earth that coincides
everywhere with mean sea level
Lattitude values change from ... [TQ] - ANSWER-North to South
Lines of constant longitude are called ... [TQ] - ANSWER-Meridians
One a globe, lines of latitude and longitude intersect at right angles (T/F) [TQ] -
ANSWER-True
What is the approximate surface distance in a second of longitude at the equator? [TQ]
- ANSWER-1500 feet/30.92 m
Converting divide the minutes by ___ and the seconds by ____ [TQ] - ANSWER-60 and
3600
What ellipsoid does the NAD83 datum use? [TQ] - ANSWER-GRS80
WGS84 is a _____ datum. [TQ] - ANSWER-Geocentric
Datum specifies what? (4) [TQ] - ANSWER-1. Shape/size of ellipsoid
2. Initial reference point (origin)
3. Precise location of benchmarks
4. The position of the ellipsoid relative to the center of the earth
Datum shift [TQ] - ANSWER-TBD
Spatial Data - ANSWER-Data with a "spatial component" describing where something is
located in space (coordinates).
Spatially Related Questions (3) - ANSWER-1. The spatial distribution of objects
2. The relationship between the spatial distribution of objects
3. The association of objects in the area
Solutions
GIS Definition - ANSWER-A computer-based system to aid in the collection,
maintenance, storage, analysis, output and distribution of spatial data and information
Variables of Map Projection Theory (4) - ANSWER-1. Projection surface
2. Light source location
3. Case
4. Aspect
Developable surface - ANSWER-A surface that can be flattened to form a plane without
compressing or stretching any part of it
Non-developable surface - ANSWER-?
Vector file formats (2) [TQ] - ANSWER-Coverages and shape files
Which data model is best suited for representing continuous spatial variables? [TQ] -
ANSWER-Raster
Which data model uses points, lines and polygons to represent real world phenomena?
[TQ] - ANSWER-Vector
Vertices and nodes [TQ] - ANSWER-Vertices are the intermediates of a line point
Planar topology is an example of topological constraint. When enforced, it requires that
all features in a layer occur in a 2-dimensional surface. (T/F) [TQ] - ANSWER-True
If a dangle length was set at 10m, a line segment that was 9m in length would be in
violation of this topological constraint. (T/F) [TQ] - ANSWER-False
Is it possible to convert a layer from one data model to another. (T/F) [TQ] - ANSWER-
True
In a DEM, what do the values represent in each cell? [TQ] - ANSWER-Elevation
Generally speaking, with a raster dataset, there is a many-to-one relationship between
cells and records in the attribute table (T/F) [TQ] - ANSWER-True
, What raster layers can you access/view the attribute table? [TQ] - ANSWER-Integer
based raster layers
As the resolution of a raster dataset increases, within cell variation... [TQ] - ANSWER-
Decreases
In an attribute table, a row is called a ... [TQ] - ANSWER-Record
In an attribute table, a column is called a ... [TQ] - ANSWER-Field
"Small", "Medium" and "Large" are examples of what type of attribute data? [TQ] -
ANSWER-Ordinal
A geoid is ... [TQ] - ANSWER-The hypothetical surface of the earth that coincides
everywhere with mean sea level
Lattitude values change from ... [TQ] - ANSWER-North to South
Lines of constant longitude are called ... [TQ] - ANSWER-Meridians
One a globe, lines of latitude and longitude intersect at right angles (T/F) [TQ] -
ANSWER-True
What is the approximate surface distance in a second of longitude at the equator? [TQ]
- ANSWER-1500 feet/30.92 m
Converting divide the minutes by ___ and the seconds by ____ [TQ] - ANSWER-60 and
3600
What ellipsoid does the NAD83 datum use? [TQ] - ANSWER-GRS80
WGS84 is a _____ datum. [TQ] - ANSWER-Geocentric
Datum specifies what? (4) [TQ] - ANSWER-1. Shape/size of ellipsoid
2. Initial reference point (origin)
3. Precise location of benchmarks
4. The position of the ellipsoid relative to the center of the earth
Datum shift [TQ] - ANSWER-TBD
Spatial Data - ANSWER-Data with a "spatial component" describing where something is
located in space (coordinates).
Spatially Related Questions (3) - ANSWER-1. The spatial distribution of objects
2. The relationship between the spatial distribution of objects
3. The association of objects in the area
