Lap #9a Introduction to Spatial Analysis

Stefanie Wieschalla

Geog 206

Part 1:

1. A spatial scope is the size or area of the input data utilized to find out the values at output locations. There are three types, which are local, neighborhood, or global operations. All reflect somehow the extent of the source area used to reveal the value at a given output site. Local operations use only the data at one input location, where neighborhood operations use data both at input location as well as nearby locations to determine output value. Yet, global operations utilize data values from the entire layer to determine each output value.

2. The two types of Algebra used in queries are set algebra and Boolean algebra. The difference exists in the fact that set algebra uses the operations less than, greater than, equal to, and not equal to, where Boolean algebra utilizes the conditions or, and, and not to select features. Selection conditions are often formalized using set algebra given that they meet one to several conditions or criteria. For example, two conditions are applied and the features that satisfy both conditions are included in the selected set like growing fruits as well as vegetables is taken place in northern plus southern California. In contrast, Boolean algebra is most often used to combine set algebra conditions and create compound spatial selections. A good example would be the expression using a Boolean AND, with two arguments for the expression. Thus, features are selected if they satisfy both arguments as for example income is higher than 5,000 a month and they are living in a house.

3. The different types of spatial selection operations are first adjacency, which are used to identify features that “touch” other features and second containment, which identifies all features that contain or surround a set of target features.

Part2:

4. Yes, there is a feature dataset called Los Angeles.

5. There are four feature classes present named: PtDumeQuad, Vegetation, Wetlands and Wetlands_Project

Part3:

6. There exist 10896 features in the vegetation feature class.

7. Now, after running the dissolve operation, there exist only nine features in the new VegCoc feature class.

8. In this new VegCov_Clip feature class there exist now 8 features.

Part4:

9. There were 404 wetland features selected in the attribute table.

10. There were 123 features selected.

11.