Maptitude Help / Creating and Editing Geographic Files / Updating Tabular Data

Updating Tabular Data

Maptitude makes estimates of the correct values of tabular data when you join or split line or area features with the editing tools. When you split features into parts, Maptitude compares the length or area of the new features with the length or area of the original feature, and uses the ratio to estimate the new values. For example, if you split an area into two parts of equal size, the data from the original feature would be divided 50-50 between the two new features. When you join two features, Maptitude adds up the data from the original features to determine a value for the new feature. For example, if you joined three counties together, Maptitude would add the population of the three counties to estimate the population of the new county.

Fields with character data are handled differently. When you split a feature into parts, Maptitude copies the value of the field to all the new features. For example, if you take a highway whose Route Name is I-70 and split it into four smaller segments, I-70 will be used as the Route Name for all four segments. When you combine two or more features, Maptitude uses the value of the field from the first feature you choose for the new feature.

You can change the way that Maptitude updates tabular data. For more information, see Aggregation Methods and To Change the Aggregation Method when Editing Map Features.