About Grouping Statistics by Attribute

Extracted summaries can be grouped by any nominal data type that exists within the point records. This includes the classification, point source/flight line, return number, number of returns, or data fields. Fields that pertain to a value related to the grouping attribute have predetermined codes that appear in the field names. The following list outlines the codes used in the field names when grouping by an attribute:

• Classification: CL
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• Point Source: PS
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• Return Number: RN
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• Number of Returns: NR
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• User Data: UD
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For example when grouping by classification, a field will be added to the database reporting the point count for each unique class value. If the class values of 0, and 2 were found there would be two fields added to the database starting with 'CL' for classification, then 'Cnt' to designate a count then the values of 0 and 2 to form the fields CLCnt_0, and CLCnt_2. These fields would be interpreted as the point count for class value of 0 or 2.

How to Group Statistics By Attribute

Group Attribute Checkbox and box

1. On the Point Cloud Statistics Extractor property page, click the Group Attribute checkbox to toggle whether the summary is extracted by an attribute.
2. Click the down arrow on the Group Attribute box, and select an attribute to group by.
   
3. Click the 'Apply' button to commit the changes.