Class Name: Spatial Resolution Level of Detail Data

Superclass - Level of Detail Data

Definition

Specifies the spatial resolution of the associated data, which governs the switching of objects by a spatial-resolution-based Level of Detail Related Geometry or Level of Detail Related Features object.

Primary Page in DRM Diagram:

• 9

Example

1. NIMA DTED is produced at a number of standard spatial resolutions: 30 arc seconds, 3 arc seconds, 1 arc second, 0.3 arc second, and so on. Although the spatial resolution of the longitudinal axis varies with latitude, the spatial resolution of the latitudinal axis is fixed (and equals that of the longitudinal axis at the equator).

2. Atmospheric data sets are often produced in an Augmented Projection- based Spatial Reference Frame, such as ALCC (Augmented Lambert Conformal Conic), at a number of standard spatial resolutions, e.g. 81 kilometers, 27 kilometers, and 9 kilometers.

FAQs

Why not just use Map Scale Level of Detail Data?

The Map Scale Level of Detail Data class can be used in some cases as a "rough" approximation. Unfortunately, while Map Scale Level of Detail Data can be reasonably applied to lower-resolutions of DTED (e.g., levels 0, 1, and 2), it doesn't apply well to higher resolutions of DTED, and doesn't apply at all to bathymetric and atmospheric data.

If the spatial resolution is different among 2 or more spatial axes, which is to be used?

In this case, normally the highest resolution is to be used.

Constraints

Component of (one-way)(inherited)

• one or more Base Level of Detail Data

Field Elements

Notes

Fields Notes

spatial_resolution

 indicates the spatial resolution of the associated data
 must be a positive value (greater than 0.0)

units

 specifies how the spatial resolution value is measured