Geography Reference
In-Depth Information
how much did Fayette County's population grow from 1970 to 1990? ____________. Note that a
highlight outlines the county on the map. Use the Identify tool to point at the highlighted county.
As you noted before, there is exact correspondence between the items in the Identify Results
window and the attribute table column heading names. Dismiss the Identify Results window and
the table.
42.
Figure out how to remove the polygon layer from the T/C and do so. Then put it back. ArcGIS
may have picked a different color when the layer is returned. Click the color patch and pick
Beige. Zoom back to the GPS track. Right-click cnty_bnd_spn polygon in the T/C and pick Label
Features from the drop-down menu. Labels from the NAME field of the attribute database
should appear: FAYETTE, MADISON, and CLARK.
TIGER/Line Files
TIGER/Line files are a product of the U.S. Bureau of the Census. TIGER stands for Topologically Integrated
Geographic Encoding and Referencing. (You really should write this identifier in your Fast Facts File, unless
your memory is better than mine. I can barely parse it, much less remember it. You have to wonder which
came first, the name or the acronym.
19
) TIGER/Line files primarily contain data related to streets—name,
street numbers, census tracks, zip codes, county and state codes, and the geographic coordinates of
these features. They were designed as the framework on which to hang the census data, and for the use
of census takers. A bit later in this chapter, you will look briefly at TIGER/Line files that represent streets,
roads, and highways.
But TIGER/Line files also include other types of data that can be represented in linear form, such as political
boundaries, railroads, and streams. Fay_Tiger and Mad_Tiger are feature classes in the feature dataset
County_streams, in the personal geodatabase Kentucky_River_Area_Data, in the folder [___]IGIS-Arc\River.
The Fay_Tiger and Mad_Tiger datasets are not TIGER/Line files, per se, but were derived from them.
43.
In the T/C, click Layers to select it. Be sure that you are zoomed to the GPS layer and
that List By Drawing Order is active at the top of the T/C. Click Add Data and navigate
to [___]IGIS-Arc\River. Pounce on it. Pounce on Kentucky_River_Area_Data.mdb. Pounce on
County_Streams. Select Fay_Tiger and click Add. Display the line as a bright blue color
and a size of 2. Pan (using the “hand” icon on the Tools toolbar) so that you can clearly
see the two streams that come into the Kentucky River along the GPS track. What are their
names? ________________________, ______________________________. Notice also, using the
Identify tool and the feature's line color, that the Fayette county side of the river is considered a
Fayette county stream. Zoom back to the GPS track.
44.
A portion of the dividing line between Clark county and Fayette county (move the map around to see
it) is visible in the northeast of the map. Zoom in on it. The line of demarcation between the two
counties is given by two different datasets: the county boundaries (cnty_bnd_spn) and the streams
(Fay_Tiger), which you will see as separate lines that cross and recross several times. Zoom in
again, looking at the place where the two lines seem most divergent. Use the Identify tool to verify
19
The forerunner of TIGER files were DIME files. DIME stood for Dual Independent Map Encoding - reflecting the
idea that two very different types of data were included: latitude/longitude on the one hand and postal addresses on
the other hand. That acronym made a lot more sense.
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