What new attribute field does the Summarize Within tool append to the counties layer?

• A. Total Area
• B. Count of Points
• C. Average Population
• D. Sum of Values

Answer: (B)

The Summarize Within tool is designed to analyze spatial data and append information to a layer based on summarized attributes of features contained within a specific area. When applied, this tool provides a count of the features that fall within the boundaries of the polygon being analyzed—such as the counties layer in this case.

The "Count of Points" attribute represents the total number of point features that are contained within each county's boundary. This is particularly useful for understanding the distribution of events, incidents, or other phenomena represented by points (like crime reports, facilities, or other features) across the various counties. By appending this attribute, analysts can easily visualize and interpret how many points exist in each area, aiding in decision-making and resource allocation.

The other options, while potentially useful metrics in other contexts, do not reflect the specific capability of the Summarize Within tool to aggregate point features. For example, attributes like "Total Area," "Average Population," and "Sum of Values" are not the direct outputs of this tool's functionality within the scope of summarizing point counts in geographic areas. Thus, the information appended from the Summarize Within tool directly corresponds to the counting of point features, making "Count of Points" the appropriate choice.