Sample questions for GOG 414/590
The correct answer is indicated by an asterisk (*)
Batch processing is usually used with
*passive output devices.
interactive output devices.
CRTs.
LCDs.
Another name for a raster is
a pixel.
a grid cell.
*a frame buffer.
a dot matrix.
A pixel refers to
a point on an image.
a line on an image.
*an area on an image.
a volume on an image.
Making the information represented by a pixel visible is called
rasterizing.
*rendering.
realizing.
rationalizing.
The limit of resolution on a monitor is the
atom.
pixel.
cell.
*dot.
The resolution of a monitor is measured as
atomic number.
pixelation.
cell diameter.
*dot pitch.
Which of the following is not a raster device?
laser printer
dot matrix printer
ink jet printer
*pen plotter
Which of the following display devices varies in rendering time with the complexity of the image?
laser printer
dot matrix printer
ink jet printer
*pen plotter
Vector refresh systems are not that popular because
they are old-fashioned.
they have poor resolution.
*they can flicker with long display files.
they cannot render color images.
Most modern refresh displays update their images at maximum speeds of at least
40 times per second.
55 times per second.
60 times per second.
*75 times per second.
The process of converting a vector image to a raster image is called
vectorization.
pixelation.
aliasing.
*scan conversion.
To display a high resolution frame buffer image on a relatively slow monitor, the monitor might use
*interlaced scanning.
non-interlaced scanning.
pixelation.
nonpixelation.
A
technique that compresses boundary or other linear representations for raster
data structures is
*Freeman chain coding.
quadtree compression.
run-length encoding.
scan conversion.
Raster
compression techniques work best when the data is
*relatively homogeneous.
relatively heterogeneous.
relatively dissimilar.
highly dissimilar.
If
every row in a binary raster alternates 0� 1� 0� 1� 0 ... then a good
compression technique would be
run-length encoding by rows.
*run-length encoding by columns.
quadtree compression.
chain coding.
Of
the following row and column dimensions, which is the only one that will work
with quadtree compression?
10 X 10
12 X 12
*16 X 16
24 X 24
Which
of the following is not a raster data set?
USGS 1:24,000 series DEM
USGS 1:250,000 series DEM
*TIN
All of the above are raster data sets.
A
rotation transformation always rotates an object relative to
its center.
its lower-left corner.
its upper-left corner.
*the origin of the coordinate system.
The
organization of graphic objects is called
*segmentation.
dissemination.
distillation.
sedimentation.
In
radian measure, 2 PI radians corresponds to
45 degrees.
90 degrees.
180 degrees.
*360 degrees.
In
matrix notation, a point is represented as
a column vector.
*a row vector.
a 2 X 2 matrix.
a 3 X 3 matrix.
To
allow all graphics transformations to be represented in matrix form, we must
use
UTM coordinates.
State Plane coordinates.
*homogeneous coordinates.
physical device coordinates.
Using
homogeneous coordinates, a 2D transformation would occupy
a row vector.
a 2 X 2 matrix.
*a 3 X 3 matrix.
a 4 X 4 matrix.
Assume
the point (4,7) is represented in matrix notation as [4 7 .5]. What do you know
about this point?
It is a UTM coordinate.
It is a State Plane coordinate.
*It is a perspective coordinate.
It is a normalized coordinate.
Hill
shading works best when illumination is coming from an azimuth of
45 degrees (upper right).
90 degrees (right).
135 degrees (lower right).
*315 degrees (upper left).
Topographic
inversion occurs for most viewers if the illumination azimuth is changed
by
45 degrees.
90 degrees.
*180 degrees.
315 degrees.
A
vector giving the slope and aspect of a local surface is provided by
computing
a dot product.
*a cross product.
a root mean square error.
a standard deviation.
The
cosine of the angle between a light source vector and the surface's cross
product vector is derived from
the cross product of those two vectors.
*the dot product and length of those two vectors.
subtracting the light source vector from the cross product vector.
subtracting the cross product vector from the light source vector.
The
brightness of a surface patch varies directly with
the cross product vector.
*the dot product of the light source and cross product vectors.
the elevation of the surface.
none of the above
A
line simplification procedure that attempts to retain cartographically
significant points was introduced by
*Douglas.
Clarke.
Makarovic.
Thiessen.
The
Douglas simplification technique retains a point on a line if
*its distance to a baseline is greater than a tolerance value.
its distance to a baseline is less than a tolerance value.
it has been marked as significant by a cartographer.
it is halfway between the starting and ending points of the line.
A
problem with the Douglas technique is that
*different cartographic line types require different tolerances.
it often misses critical significant points.
it requires enormous amounts of computing time.
it is hopelessly outdated.
The
Douglas procedure will end when
the distance of all remaining points to the baseline is greater than the
tolerance distance.
*the distance of all remaining points to the baseline is less than the
tolerance distance.
it finds the endpoint of the line.
none of the above