Modifying Layer Dimensions

Layers must contain geographical and dimensional information. Information that TerraBuilder can infer from other values you provided does not have to be supplied. For example, if you specify the UPP X and Left X geographical coordinates, TerraBuilder automatically calculates the Right X-coordinate information in the Dimensions group of the Properties Sheet.

A source with no coordinates is automatically aligned with the top-left (Northwest) corner of the project and is not included in the output. To change its status you need to assign coordinates and then manually change its status so it is included in the output.

Note: The data in the Dimensions group of the Properties Sheet for a reprojected source is read-only, and cannot be changed.

To add or modify layer dimension data:

1. In the Layer List, select a layer or layers.

2. If more than one layer is selected only information that is common to all the selected layers is displayed.

3. In the Properties Sheet, in the Dimensions group, enter the following information:

Field	Description
Left X	West geographical coordinate.
Upper Y	North geographical coordinate.
Right X	East geographical coordinate.
Lower Y	South geographical coordinate.
Layer UPP X	Units per pixel for the layer's X axis.
Layer UPP Y	Units per pixel for the layer's Y axis.
UPP in Project	Select the layer’s units per pixel value. Legal values for UPP are restricted to values on the Project ruler. See “Aligning Source Files to the Ruler” in the “Terms and Definitions” chapter for more information.
Max Visible UPP	Select from the list the maximum UPP for which the layer should still be visible.
Size in Pixels (W, H)	Size of the file in pixels is automatically displayed (read-only).
Geographic Width	Width of the layer (Right X - Left X).
Geographic Height	Height of the layer (Upper Y - Lower Y).

Note: The layer information in the Layer List is automatically updated according to the data in the Dimensions group of the Properties Sheet.