Extraction Options

Calculations are performed on all numeric fields in the file unless identified for exclusion or other operation in Numeric Exceptions. None of the options affect From and To values. Cut highs to value is only applied to the extraction field. If a value in a record of the extraction field is blank then that record will be ignored by all operations.

The following extraction options are available:

AVERAGE

Calculates arithmetic averages for all Numeric fields (except From/To) not excluded by the settings in Numeric Exceptions. If you define a value for Cut highs to: it only applies to the extraction field.

WTAVG

Calculates length weighted averages for all Numeric values not excluded by the settings in Use other extraction types. The accumulated product (the sample length multiplied by the numeric value for each record.) is divided by the total from/to interval of the identical records to calculate the WTAVG.

MIN

Extracts a single record containing the minimum value of the extraction field and all Numeric fields not excluded by the settings in Use other extraction types.

MAX

Extracts a single record containing the maximum value of the extraction field and all Numeric fields not excluded by the settings in Use other extraction types.

SUBUNIT

This type of extraction will subdivide records with a from/to interval greater than your entry in sub unit interval into records with from/to intervals equal to the value entered in sub unit interval. It writes them, together with records whose from/to interval is equal to or less than the value entered in Sub unit interval, to the Output file. Any remaining portion of a subdivided interval will be written as a record to the Output file.

This type of extraction does not recalculate coordinates or duplicate any values in Numeric fields but does duplicate values in Character fields into the new records. If subdividing to less than 1 unit intervals, check that the from/to parameters are defined to sufficient decimal places. When selected, many parameters are inaccessible, values that are present in these fields will have no effect on the program operation.

SUM

Extracts to (while values in the Constant fields are identical) a single record containing the sum of values in the extraction field and all other Numeric fields.