Defining a Spatial Analysis Component
Definitions of the parameters that can be set for Spatial Calculation, Spatial Condition, and Volume Grid component types are provided below.
Spatial Calculation
A spatial calculation can be any of the following types:
Types | Description |
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Altitude At Location |
The spatial calculation is defined as the altitude at various locations with respect to specified reference. The altitude is measured differently depending on the parameters listed below.
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Angle To Location |
The spatial calculation is defined as the angle to various locations with respect to the specified reference. The angle is measured differently depending on the parameters listed below.
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Atmospheric Density At Location | The spatial calculation is defined as the atmospheric density at various locations evaluated according to the specified model.
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Distance To Location |
The spatial calculation is defined as the distance of various locations from the specified reference. The distance is measured differently depending on the parameters listed below.
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File | The spatial calculation is defined by externally generated volumetric data stored in the same type of HDF5-formatted file that can be selected for the Volumetric object. |
Propagation Delay To Location. | The spatial calculation evaluates the propagation delay between the specified reference and various locations. Measurement of the delay is controlled by the same parameters as Distance from the Reference plus either the Light or Custom speed selection.
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SEET Electron/Proton Radiation at Location | The spatial calculation evaluated Electron/Proton Radiation at various locations. |
SEET Impact Flux At Location | The spatial calculation evaluated Impact Flux at various locations. |
SEET Magnetic Field At Location | The spatial calculation evaluated Magnetic Field at various locations. |
SEET SAA Flux At Location | The spatial calculation evaluated SAA Flux Intensity at various locations. |
Scalar At Location |
The spatial calculation is defined by placing its parent object at various locations on the grid and evaluating the selected (non-spatial) Scalar Calculation from the Calculation tool. Volumetric evaluations using the Scalar At Location Spatial Calculation can become exceedingly slow in cases where the selected (non-spatial) Scalar Calculation is derived from times determined from Access or Chains computations; e.g., using Elapsed Time type of Scalar Calculation with reference Time Instant set to AccessStartTime.
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Spatial Condition Satisfaction Metrics | The spatial calculation is defined as various metrics derived from satisfaction intervals computed for the specified spatial condition. The metrics are defined according to the parameters listed below.
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Solar Intensity | The spatial calculation is defined as a fraction of the full solar intensity that may be observed at various locations while taking into account the selected eclipsing bodies. |
Spatial Condition
A spatial condition can be any of the following types:
Types | Description |
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Access to Location |
Moves the selected grid constraint object to specified locations on the grids and defines satisfaction as having Access between parent and the grid constraint object. Constraints from both the parent and grid constraint object are used. Click Advanced Options... to configure Light Time Delay settings for Access evaluation. The Grid Constraint object cannot be any ancestor or descendant of the parent object of the calculation. |
Combined | Combines multiple constituent spatial conditions using one of several merging operations:
The Minus operation is available when there are only two components in the combined list. |
Condition at Location |
Moves its parent to selected locations on grids and then evaluates selected (non-spatial) condition from the Calculation tool. Click Advanced Options... to configure computational settings for determining condition satisfaction. |
Grid Bounding Volume |
Implicitly defines the bounding volume filled by the selected volume grid. Two types of extents are available:
Both of these types are automatically available as embedded components for any installed or user-created volume grid. |
Lighting | Determined by one or more selected lighting conditions (Sunlight, Penumbra, Umbra) that may be observed at various locations while taking into account selected eclipsing bodies. |
Over Time |
Evaluates the satisfaction of any other spatial condition over specified intervals of time. It is considered satisfied within specified intervals if the original Spatial Condition is satisfied at any time within these intervals. You can use any Interval or Interval List from the Time tool and additionally define the Duration Type as:
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Spatial Calculation Bounds |
Places numerical bounds on values produced by the Spatial Calculation. It is satisfied when the values are within specified bounds. The bounds are defined by min and/or max values and the associated operation: Above Minimum, Below Maximum, Between Minimum and Maximum, Outside Minimum and Maximum. |
Valid Time at Location | Moves its parent to selected locations on the grids and then evaluates whether time falls within the selected Interval or Interval List from the Time Tool. |
Volume Grid
A volume grid can be any of the following types:
Types | Description |
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Cartesian | The coordinates of the grid are X, Y, Z. The Reference Coordinate System is from the Vector Geometry tool. To select and define the coordinate steps, click Set Grid Values.... |
Cartographic | The Cartographic grid uses latitude, longitude and altitude based on the central body reference ellipsoid. To select and define the coordinate steps, click Set Grid Values.... |
Constrained | Volume grid in which the grid points from reference grid are available only when the spatial condition is satisfied. |
Cylindrical | The coordinates are Theta, Radius, and the Height Reference Coordinate System from the Vector Geometry tool. To select and define the coordinate steps, click Set Grid Values....> |
Spherical | The coordinates are Azimuth, Elevation, and the Range Reference Coordinate System from the Vector Geometry tool. To select and define the coordinate steps, click Set Grid Values.... |
Surface Bearing | Grid oriented along the bearing of the central body reference ellipsoid and raised to multiple altitudes. |