Geography Reference
In-Depth Information
Northern boundary: _________________
Southern boundary: _________________
You will use these numbers later when you make a personal geodatabase feature dataset that
encompasses the Kentucky north zone.
27.
Dismiss ArcMap but save the map as Temp.mxd in
___IGIS-Arc_
YourInitials
\Digitize&Transform
In ArcCatalog click on Folder connections and press F5 to collapse the Catalog Tree, then
dismiss ArcCatalog.
Primary Lesson
If you take only one point away from this exercise, it should be that there are a multitude of ways to
reference points on the surface of the Earth, and that if you combine data sets, either (a) they must
all agree in all parameters or (b) you must know exactly what you are doing. For the case of (b), in the
absence of having access to a geodesist, we recommend two resources to start with. First are the texts
Understanding Map Projections
by Esri and
Lining Up Data
by Margaret M. Maher also published by Esri.
The second resource is to navigate to the Esri website,
www.esri.com.
Then select the support page and
type 21327 in the Search Support box. You should see an article entitled “(How To:) Select correct datum
transformation when projecting between datums.” Reference material, labeled “Related Information,”
will be found on this Web page.
Exercise 5-2 (Project)
Look at Geographic Data on the web
Starting with some of the Web address in the Overview of this chapter, locate five spatial datasets both in
your geographic area and on a topic interesting to you. Make a list of those sources you find.
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