Fields

On the Fields tab of the Reference Block Model form, field values (or the expressions derived from the field values) of individual blocks or partial blocks selected from the block model, can be aggregated to provide attributes for the task wireframes generated from the block model data.

A sum of the hours assigned to blocks might be aggregated, for example, from truck hours assigned to the blocks in the block model file. These aggregated values can then be assigned as attributes of the task wireframes, which can then be targeted or constrained in the schedule.

Fields for Aggregation

Output

Select the check box to add the specified attribute to the output wireframes. If this check box is not selected, the attribute is not saved to the output wireframes, however its value may be included in the Expression or Weighting settings for a subsequent attribute.

Name

The name of a wireframe attribute into which the block expression values will be aggregated.

Expression

An expression for which block values are to be aggregated. The expression may be defined by a single block model field or a previously-defined wireframe attribute. The context of the expression may include the block model fields and the wireframe attributes defined in a previous row.

Factor Partials

Use this check box to determine whether expression values for blocks not completely contained within a wireframe are to be scaled.

For example, if the check box is selected and only 15% of the volume of a block is contained within the wireframe, the expression values for that block will be scaled by 0.15.

The check box defaults to unselected, indicating that the block expression values will not be scaled.

Aggregate Function

Select the function to be used to aggregate expression values from constituent blocks into the attributes for the wireframes. WGT AVG is the default for Real or Float fields. DOMINANT is the default for Character fields. Statistical functions are available for selection, such as median, sample variance, population variance, sample standard deviation and coefficient of variation.

Weighting

This option is enabled or disabled depending on which Aggregate function (above) is specified.

Select a block model field or a previously-defined wireframe attribute, the values of which will be used to weight the result from the expression. If the Factor Partials check box is selected, then scaled values will be used for the weighting.