Introducing Geographic Information Systems with ArcGIS: A Workbook Approach to Learning GIS, 3rd Edition

Looking at the Landcover Personal Geodatabase Feature Class

____ 20. Navigate to the Area_Features personal geodatabase feature data set. Click it. Within it you should see Landcover feature class that you created from the Landcover coverage. Select it. Click the Preview tab. You see a map of the landcover you worked with in Assignment 1-1. In the drop-down menu in the Preview text box, select Table. How many land cover polygons are there? ____________ Check this against the number of polygons in the Landcover coverage that you wrote down previously.

____ 21. Examine the Landcover feature class table. Notice the fields Shape_Length and Shape_Area. These attributes are the perimeters and areas of the polygons. Sort the Shape_Area column into descending order. The largest polygon is a portion of the lake, with a land cover code of 500. What is the perimeter of the polygon with the largest land area (to the nearest 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
___________	___________	___________
___________	___________ ...