Introduction GIS: Notes:

1: Frame the Question: Start by figuring out the information that is needed. How will this information be used and who will use it.

2. Understand your data: Type of data you are working with and what new information will need to be gathered or created.

3. Choose a method: Some methods might be quicker with more approximated information while other will take longer but have more detail.

4. Process Data: Perform steps in GIS.

5. Look at results: Is the information valid and useful, will it help others easily see the information.

Types of Features:

Discrete: Location can be pinpointed to show whether the feature exists or not.

continuous Phenomena: Blanket the entire map to show data with no gaps.

Summarized by area: counts or density within a boundary.

Models of the world:

Vector: Each feature in a row of a table and featured shapes are defined by x,y.

Raster: Features are represented as a matrix of cells in continuous space.

Types of attribute values:

categories: a group of similar things.

Rank: Put features in order from high to low.

Counts and amounts: Show total numbers.

Ratios: Show relationship between two quantities, and are created by dividing one quantity by another.

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