Lab 7

LAB 7
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1. List 4 common spatial data formats.
       Shapefiles, coverages, CAD files, and geodatabases
2. What is a feature class?
       A group of points, lines, or polygons represent geographic objects of the same kind, like countries or rivers.
3. How many features classes can a shapefile contain? How many can a personal geodatabase contain?
       A shapefile can containone feature class. A personal geodatabase can contain many (there is no size limit.)
What 2 things must you define when you create a new feature class?
       Feature class geometry, (point, line, or polygon,) and the spatial reference.
5. What are fields (in the context of creating a new feature class?)
       A field, defined by a name, data type, and varying properties, is used to store attribute information.
6. What is "heads-up digitizing"?
       When features are drawn with a mouse directly on a computer screen by tracing an aerial photo, scanned map, or other spatial data.
7. What is snapping?
       When ArcMap automatically connects features placed within a certain distance of each other.
8. What is the difference between a vertex and an edge on a line?
       A vertex is a point where two lines intersect or where a line changes direction. An edge is the part of the line between two vertices or endpoints if it is a straight line.
9. What attributes does ArcMap automatically update for you if you split or merge features in a personal geodatabase? (By the way, these attributes are not updated when you edit a shapefile.)
       Shape_Length and Shape_Area attributes are automatically updated by ArcMap.
10. How many parcels in Exercise 16c are at least 2 acres in size?
       75