Geography Reference
In-Depth Information
meter)? ____________ meters. What is the area of the smallest polygon (record all digits)?
_________________________ square meters. Contrast this “double precision” number with the
one you previously recorded for the same polygon in the Landcover coverage.
22.
Find the Landcover feature class attributes and their properties with a right-click on the
Landcover icon. Then, in the Properties window select Fields. Fill out the following table, except
for Width:
Field Name
Data Type
Width
___________
___________
___________
___________
___________
___________
___________
___________
___________
___________
___________
___________
___________
___________
___________
___________
___________
___________
23.
Cancel the personal geodatabase Feature Class Properties window. Find the names of
the attributes by using the metadata, check them against what you wrote above, and add the
Width. (Hint: It's in ESRI Fields and Subtypes. To repeat: when you click text with an arrow
pointing down beside it, you see more text and the arrow points to the right. Clicking
again or clicking the Hide button with an upward-pointing arrow contracts
the text.)
Further Examining the Wildcat Boat Facility
Area Data Sets
Do the following steps using the datasets in
___IGIS-Arc_
YourInitials
24.
In the Catalog Tree, click Soils feature class, within the Area_Features feature data set. Click
the Preview tab.
This feature class uses polylines to enclose areas (polygons). Each of the polygons is considered to be
homogeneous in a particular type of soil.
25.
Using the Identify tool from the Geography toolbar, click a polygon near the center of the map.
The polygon becomes momentarily highlighted, and the Identify Results window appears. You
get the plane area of the feature in square meters in the field Shape_Area. You also get, in the
field Shape_Length, the sum of lengths of the polylines (in meters) that enclose the polygon.
In the attribute field named SOIL_CODE, you are shown a code that identifies the soil type,
such as Tn4. There is also an attribute (SUIT) that indicates whether the soil is suitable for
the construction of a building: 1 for unsuitable, 2 for moderately suitable, or 3 for suitable.
Click some other polygons. Click the largest polygon in the northeast (That's water—note the
SUITability and the SOIL_CODE: _______, ____). Dismiss the Identify Results table.
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