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ArcGIS - ESRI New Exam With Complete Solutions 100% Verified
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ArcGIS - ESRI New Exam With CompleteSolutions 100% Verified
Two ways you can map density using attribute values? - ANSWER One way is to divide
the attribute values by the area of each polygon feature (i.e. data normalisation)
Another way is to do so visually using symbology to represent quantities of things in the
real world (such as a dot density map)
What are two types of coordinate systems? - ANSWER Geographic
Projected
What is a GCS?
What is it measured in? - ANSWER A GCS is used to locate objects on the curved
surface of the earth, attempts to model the shape of the earth as accurately as possible
DMS
What is a PCS? Based on what? Where is the origin? - ANSWER A PCS is used to locate
objects on a flat surface (GIS map on computer screen)
Cartesian
Origin at (0,0) in the middle of the map
What are lines of longitude called? Latitude? What angles are they measured at? -
ANSWER Longitudes are meridians and latitudes are parallels
Longitudinal coordinate represents line at prime meridian and line extending east along
equator Latitudinal coordinate represents a line on the equator and a line extending
north along the 60 meridian
What are the two shapes people commonly use to model earth? Which does Stark think
, it is? - ANSWER Sphere (best if small scale)
Spheroid best if large, stark thinks earth is spheroid
What is a datum? ANSWER In short, a datum serves to orient the spheroid with respect
to the earth's surface. It tells which spheroid you use as the earth model, and precisely
where on Earth's surface you would orient that spheroid.
What does a datum define for GIS? - ANSWER It defines the origin, or the point where
the spheroid matches up perfectly with the surface of the earth and where the
latitude-longitude coordinates are true and accurate; all other points are in reference to
the origin
All geographic datasets have GCS but not PCS (T/F) - ANSWER TRUE
ArcGIS can perform an on the fly projection if the PCS does not match with other layers
T/F - ANSWER TRUE
What are three types of surfaces that can be projected on to a map? - ANSWER Cylinder
Cone
Planar
Where is a cylinder projection most accurate? What kind of maps can you produce? -
ANSWER Most accurate in equatorial zones
Produces maps with straight, equally spaced meridians and straight parallels that
intersect meridians at right angles
Where is a conic projection most accurate? What type of maps are you able to create? -
ANSWER Most accurate in mid-latitudinal zones
Produces maps with straight converging longitude lines and concentric circular arcs for
latitude lines
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