AzimuthElevationMask Class

An Azimuth-Elevation Mask describes how the horizon looks to a stationary object. It holds the maximum obscured elevation angle in each sampled direction from the stationary object. It can also keep track of the maximum elevation angle as a function of the linear distance from the origin of the mask. For example, if the stationary object is in a canyon, objects also inside the canyon are visible at a very low elevation angle. However, objects past the canyon walls are only visible if they are at a much steeper elevation angle such that they are above the walls.

AzimuthElevationMask is a collection of ElevationMask instances. Each ElevationMask corresponds to a particular direction. The direction is described by the Azimuth property as an azimuth angle measured from North toward East. The maximum obscured elevation angle in that direction is described by the Elevation property. Each ElevationMask instance is also a collection of ElevationRise instances, each of which describes a change in the maximum obscured elevation angle along the ray. The ElevationRise also records the linear distance from the origin of the mask to the obscured point along the given azimuth and elevation angles.

Use TerrainAzimuthElevationMask to compute an AzimuthElevationMask from terrain data. Use the GetMaximumObscuredElevation(Double, Double) method to query the maximum obscured elevation angle as a function of azimuth and distance. Alternately, you can use DelayedTerrainAzimuthElevationMask to produce an IAzimuthElevationMask which computes its values on demand, which is useful in cases where only a small swath of the mask needs to be computed for analysis.

NOTE: All of the ElevationMask instances in this collection must be sorted by azimuth in increasing order and the azimuths must not wind. The collection must have at least 2 items.

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