cbrn:InclinationValue

An object's orientation (i.e., radiation measurement instrument, radiation detector, or measured item) with respect to the horizontal plane.  Its value is the angle subtended by the line formed by the objects front-to-rear axis and the line formed by the projection of that line onto the horizontal plane. The angle range is from "-90.0" to "+90.0" degrees. A value of zero implies the object's front-to-rear axis is level, i.e., aligned with the horizontal plane; positive values implies the object is pointed up; negative values imply the object is pointed down.