(A) What is the difference between
selection by attributes and selection by location?
Selecttion by attributes is finding
feature of similiarities among attributes. In selection by location, it
is a spatial relationship to other features
(B) What is the difference between an attribute query and a definition
query?
An attribute query looks for features
and this is where the dialog box and the typing in the equation occurs.
In a definition query, it can be used for outside
sources and
this is where just the equation appears.
(C) What steps would you use to begin a spatial join (as opposed to a
join based on attributes)?
First
right click on the target layer-join or relate tab-then click the join
button. Select the desired feature and click join.
Chapter 11 Questions:
(D) If you want to select part of an existing layer and create a new
layer out of it that actually exists as a separate data file that you
could put in another map document file, what two functions do you have
to choose from?
Two option, a personal geodatabase or a
shapefile
(E) If you just want to take part of an existing layer and display it
as a separate layer within the current map document file, what steps
would you perform?
Use the geoprocession wizard then
select the options or the desired features to create the new layer and
click finish.
Chapter 12 Questions:
(F) What is the difference between a union and an intersect operation
done on two polygon layers?
A union is non-overlapping areas that
are included in the new data set. An intersect is only the coincident
geometery that is perserved.
(G) Which operation, union or intersect, can be done with a line layer
and a polygon layer?
An intersect
Chapter 13 Questions:
(H) What is the difference between a geographic coordinate system
(GCS) and a projected coordinate system (PCS)?
The GCS only uses latitude and
longitude as its features for mathmatical calculations. The PCS uses
mathmatical transformation of data for its math calculations.
(I) Let’s say you obtain a spatial dataset off the web and add it to an
ArcMap file you are working on, but in the process you get the error
message shown on p. 340. What application or program do you use
to tell ArcGIS what projection the data is in?
I would use the Definition Projection
Wizard that is located within ArcToolbox.
(J) Where do you find out what projection the data is in? (What
is “data about data” called?)
It is located in the metadata.
(K) For practice with this, go to the National Atlas Map Layers
Warehouse (http://www.nationalatlas.gov/atlasftp.html). What map
projection is used for the “Land Cover Characteristics” GeoTIFF
file?
The Lambert Azimuthal Equal Area projection.
Natioal Atlas Website