Define the object and attribute acronyms that will be used to create features.
Generating contours also creates a bounding polygon, which represents the inside and outside extent of the data used to derive the contours. By default, this is created using the cvrage (Coverage Area) object acronym, but if this does not exist in the catalogue of the feature layer, the first acronym in the list will be selected instead. All open contours are connected to the boundary by connected nodes.
For the bMIO format, a metadata object such as M_QUAL can be used for the boundary object. |
You can create contour lines, contour areas, or both.
If you are using the Bathy DataBASE catalogue, the Line object field is set to DEPCNT and the Value attribute field is set to VALDCO by default. For area features, the Area object is set to DEPARE and Min value and Max value are set to DRVAL1 and DRVAL2 respectively.
Interface
Option | Description |
|---|---|
Create boundaries | On: Boundary objects will be generated. The Boundary object option becomes available. Off: No boundary objects will be generated. |
Boundary object | The object acronym for the boundary objects. |
Create contour lines | On: Generate contour lines. Off: Do not generate contour lines. |
Line object | The object acronym for the contours. Select from the list. |
Value attribute | The attribute acronym used to assign values to the contours. Select from the list. |
Create areas | On: Generate depth area features. Off: Do not generate depth area features. |
Area object | The object acronym that for the areas. Select from the list. |
Min value attribute | The attribute acronym that will be used to assign minimum values for the areas. Select from the list. |
Max value attribute | The attribute acronym that will be used to assign maximum values for the areas. Select from the list. |
Automatically populate SORIND | On: Automatically define the SORIND (source indication) attribute value for the contours and areas. Off: Do not define SORIND, |
Procedure
1. Select an object acronym for the boundary feature.
2. Set any other necessary options.
3. Click Finish.
The required features are created.
If the amount of available memory is insufficient to create the required number of contours, an error message is displayed. You may have to restart the application to clear your virtual memory. |
If the output layer uses the Bathy Database catalogue, any isolation type contours will have the isotyp (Isolation Type) attribute defined automatically. A contour is considered an isolation type if it contains a shoal (shoaler than the surrounding elevation values) or a deep (deeper than the surrounding elevation values), or is unknown. This attribute can be used to filter the contour features or to resolve isolations when creating depth areas in the future. The isotyp value for a selected contour can be updated in the Attributes window.
Any warnings that are generated for the depth areas are displayed in the Output window, grouped according to the warning type. These messages include hyperlinks to the depth areas that triggered the warning.