The SEDRIS Data Representation Model
APPENDIX A - Classes
Property Value

Class Name: Property Value

Superclass - <Property>

Subclasses

This DRM class is concrete and has no subclasses.

Definition

Information associated with a variety of SEDRIS objects used for a variety of purposes, e.g. for 2D or 3D rendering, interpretation, and/or simulation.

Primary Page in DRM Diagram:

Secondary Pages in DRM Diagram:

Example

  1. The <Property Value> instances of a lake might include its EAC_SURFACE_MATERIAL_TYPE.

  2. Consider the man-made materials that can be found on any surface, such as cloth, carpet, asphalt, silk, metal, and natural materials, such as wood. To specify the material making up a wooden wall represented by a <Polygon>, the data provider represents it as 

              <Polygon>
               <>
               |
               |
          <Property Value>
             meaning = { SE_ELEM_CODE_TYP_ATTRIBUTE,
                        { EAC_SURFACE_MATERIAL_TYPE }}
             value = { SE_PDV_ENUMERANT_CODE, { EEC_SRFMATTY_WOOD }}

  3. Consider an <Areal Feature> representing a surface covered with vegetation. To specify the type of vegetation, the data provider gave it a <Property Value> component with a meaning of EAC_VEGETATION_TYPE, and the value specifying the exact type of vegetation.

  4. Consider an <Areal Feature> labeled as "Red Field", because the surface represented has clay soil present. To describe the soil composition at some point or for some surface, <Property Value> instances are used, so a <Property Value> of the appropriate attribute is attached to the <Areal Feature>.

  5. Consider acoustic response, that is, changes to characteristics of objects in response to acoustic stimuli, such as the resonant frequency of a plate, response (such as echo, phase shift, absorption, diffraction), or frequency.

  6. Consider electromagnetic emission, that is, the emission characteristics of a geometric object or feature, including the electromagnetic wavelengths, amplitudes, and directionality. Examples include

    1. The thermal signature of a rock at noon is described by its electromagnetic emission.
    2. The headlight of a truck.

  7. Consider electromagnetic response, that is, changes to characteristics of objects in response to electromagnetic stimuli. Some examples of such properties include reflective and specular characteristics of a surface.

  8. Consider hydrology, that is, an attribute describing some aspect of the flow of water at a location or on a surface. For the <Polygon> instances that represent Salmon Creek, an example hydrology property represented by <Property Value> instances is the average speed of currents in the stream bed.

  9. <Property Value> instances can provide metrics, measurements that that relate to scalar properties, such as the elevation at a particular location.

FAQs

No FAQs supplied.

Constraints

Composed of (two-way)(inherited)

Component of (two-way)

Inherited Field Elements

SE_Element_Type meaning; (notes)
EDCS_Unit_Code value_unit; (notes)
EDCS_Scale_Code value_scale; (notes)

Field Elements

SE_Property_Data_Value value; (notes)

Notes

Fields Notes


meaning

 This specifies the meaning of the given <Property> instance.

value_unit

 This specifies the unit of measurement of the given <Property> instance.

value_scale

 This specifies the scale applicable to value_unit.

value

 This is the value of the given property.
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Last updated: May 15, 2003 Copyright © 2003 SEDRIS™