Using the Spatial Analysis Tool with the Volumetric Object

STK Pro, STK Premium (Air), STK Premium (Space), or STK Enterprise
You can obtain the necessary licenses for this tutorial by contacting AGI Support at support@agi.com or 1-800-924-7244.

The results of the tutorial may vary depending on the user settings and data enabled (online operations, terrain server, dynamic Earth data, etc.). It is acceptable to have different results.

This tutorial requires STK 12.9 or newer to complete.

Capabilities Covered

This lesson covers the following STK Capabilities:

Analysis Workbench
Coverage

Problem Statement

Engineers and operators require a quick way to create calculations and conditions that depend on locations in 3D space which are, in turn, provided by user-definable volume grids. The grids can provide both analysis and general situational awareness. In this tutorial, you need to determine the following in a 3D volume of space:

Distance and location from a ground site
Sensor visibility
Accumulated sensor visibility against a moving target

Solution

Use STK and the Analysis WorkbenchSpatial Analysis tool to create calculations and conditions that depend on locations in a user-defined 3D grid. Combine the spatial calculations and volume grids in the Volumetric object to report calculations over time and across grid points. Then, visually depict the volume representing various values interpolated across the grid points.

What you will learn

Upon completion of this tutorial, you will be able to create the following:

Simple cartographic grids
Constrained grids
Spherical grids on moving objects
Spatial calculations

Watch the following video. Then follow the steps below, which incorporate the systems and missions you work on (sample inputs provided).

Creating a new scenario

Create a new scenario.

Launch STK ().
Click Create a Scenario in the Welcome to STK dialog box.
Enter the following in the STK: New Scenario Wizard:

Option	Value
Name:	Volumetrics_SpatialAnalysis
Location:	Default
Start:	Default
Stop:	+ 90 sec

Click OK when finished.
When the scenario loads, click Save (). A folder with the same name as your scenario is created for you in the location specified above.
Verify the scenario name and location and click Save.

Save () often!

Preparing your view

The 2D Graphics window and Timeline View are not used in this analysis.

Close the 2D Graphics window.
Close the Time View.
Maximize your 3D Graphics window.

Setting animation time to the analysis period

Your scenario is set to analyze for 90 seconds. Scenario animation defaults to the start time of your analysis period but will continuously move forward in time. Set the animation time to match your analysis period of 90 seconds.

Right click on Volumetrics_SpatialAnalysis () in the Object Browser.
Select Properties () in the shortcut menu.
Select the Basic - Time page when the Properties Browser opens.
Select the Stop at Time check box in the Animation frame.
Click Apply to accept your changes and to keep the Properties Browser open.

Turning off Terrain Server

Analytical and visual terrain is not required in this analysis.

Select the Basic - Terrain page.
Clear the Use terrain server for analysis option.
Click OK to accept the changes, and close the Properties Browser.

Inserting a Facility object

Insert a Facility () object that will function as your ground site.

Bring the Insert STK Objects Tool to the front.
Select Facility () in the Select An Object To Be Inserted list.
Select the Insert Default () method in the Select A Method: list.
Click Insert... .
Right click on Facility1 () in the Object Browser.
Select Rename in the shortcut menu.
Rename Facility1 () to Ground_Site.

Inserting a Sensor object

The Sensor () object will function as the field of view for Ground_Site ().

Insert a Sensor () using the Define Properties () method.
Select Ground_Site () in the Select Object dialog box.
Click OK.

Creating the Sensor object's field of view

Set the Sensor () object's field of view.

Select the Basic - Definition page when the Properties Browser opens.
Enter 15 deg in the Cone Half Angle field in the Simple Conic frame.
Click Apply to accept your change and to keep the Properties Browser open.

Creating a spinning sensor

Create a spinning sensor and define its spin rate, elevation and azimuth.

Select the Basic - Pointing page.
Open the Pointing Type: shortcut menu.
Select Spinning.
Set the following:

Option	Value
Definition - Spin Rate:	10 revs/min
Spin Axis - Elevation:	50 deg
Spin Axis - Cone Angle:	20 deg

Click OK to accept your changes and to close the Properties Browser.
Rename Sensor1 () to GS_FOV.

Inserting an Area Target

The Area Target () object will function as your test area.

Insert an Area Target () object using the Area Target Wizard () method.
Type Test_Area in the Name: field when the Area Target Wizard opens.
Open the Area Type: shortcut menu.
Select Ellipse.
Set the following:

Option	Value
Semi-Major Axis:	7 km
Semi-Minor Axis:	4 km
Bearing:	45 deg
Centroid: - Latitude	40.0386 deg
Centroid: - Longitude	-75.5966 deg

Click OK to accept your changes and to close the Area Target Wizard.

Set an elevation constraint

Set Test_Area's () minimum elevation constraint to 90 degrees. This will constrain visibility to everything within Test_Area ().

Open Test_Area's () properties.
Select the Constraints - Active page when the Properties Browser opens.
Click Add new constraints () in the Active Constraints toolbar.
Select Minimum Elevation in the Constraint Name list when the Select Constraints to Add dialog box opens.
Click Add.
Click Close to close the Select Constraints to Add dialog box.
Enter 90 deg in the Angle: field in the Minimum Elevation frame in the Constraint Properties section.
Click OK to accept your changes and to close the Properties Browser.

Inserting an Aircraft object

Insert an Aircraft () object that will function as your test aircraft.

Insert an Aircraft () object using the Define Properties () method.
Select the Basic - Route page when the Properties Browser opens.
Click Insert Point three (3) times.
Set the following for the three waypoints:

Waypoint	Latitude	Longitude
1	39.9966 deg	-75.6391 deg
2	40.0929 deg	-75.6204 deg
3	40.1253 deg	-75.5595 deg

Click Set All... .
Select the Altitude: and Turn Radius: check boxes when the Set All Grid Values dialog box opens.
Enter the following:

Option	Value
Altitude:	12000 ft
Turn Radius:	1.7 km

Click OK to accept your changes and to close the Set All Grid Values dialog box.
Click OK to accept your changes and to close the Properties Browser.
Rename Aircraft1 () to Test_Flight.

3D Graphics window view

Zoom to Test_Area () to obtain situational awareness.

Bring the 3D Graphics window to the front.
Right click on Test_Area () in the Object Browser.
Select Zoom To in the shortcut menu.
Use your mouse to zoom out so that you can see all of your objects plus Test_Flight's () route.

Using the Spatial Analysis Tool

The Spatial Analysis tool is part of the Analysis Workbench. It allows you to create calculations and conditions that depend on locations in 3D space which are, in turn, provided by user-definable volume grids. Combining spatial calculations and volume grids in Volumetric () objects enables you to report and graph calculations over time and across grid points, as well as visually depict volumes representing various values interpolated across grid points.

Right click on Test_Area () in the Object Browser.
Select Analysis Workbench… () in the shortcut menu.
Select the Spatial Analysis tab in the Analysis Workbench.

The Spatial Analysis tab is used to create the following spatial components:

Spatial Calculation (), which is a scalar calculation that depends on both time and location.
Spatial Condition (), which is a condition that depends on both time and location.
Volume Grid (), which is a collection of enumerated points placed in 3D space using steps taken in each coordinate using various coordinate types.

Creating a Cartographic grid

The Cartographic grid uses latitude, longitude and altitude based on the central body reference ellipsoid.

Click Create new Volume Grid ().
Keep the default Type: of Cartographic in the Add Spatial Analysis Component dialog box.
Type SimpleCartographic in the Name: field.
Look at the following check boxes:

Automatically fit to Area Target is enabled: attaches the center of the grid to the Area Target's centroid.
Constrain active grid points within Area Target is enabled: tells STK to analyze the grid points contained inside the Area Target, not the overflow points outside the Area Target.

Clear the Constrain active grid points within Area Target check box.
Click Set Grid Values... .
Set the following parameters in the Altitude frame in the Grid Values dialog box:

Option	Value
Minimum:	0 km
Maximum:	10 km
Number of Steps:	20

When choosing a Number of Steps: value, the greater the value, the more points in the grid. The more points available fine tunes your analysis but compute time can take longer.

Click OK to accept your changes and to close the Grid Values dialog box.
Click OK to close the Add Spatial Analysis Component dialog box.

Inserting a Volumetric Object

The Volumetric () object is defined in terms of components from the Analysis Workbench. It also enables you to define various graphics properties, and has associated data providers for reporting and graphing.

Insert a Volumetric () object using the Insert Default () method.

Select the volume grid

Select the SimpleCartographic grid that you created as your volume grid.

Open Volumetric1's () properties ().
Select the Basic - Definition page when the Properties Browser opens.
Click the Volume Grid: ellipsis ().
Select Test_Area () in the Objects list in the Select Volume Grid for Volumetric1 dialog box.
Select SimpleCartographic () in the Volume Grids for Test_Area list.
Click OK to accept your changes and to close the Select Volume Grid for Volumetric1 dialog box.
Click Apply to accept your changes and to keep the Properties Browser open.

View the volume grid in the 3D Graphics window

You can view your volume grid in the 3D Graphics window.

Bring the 3D Graphics window to the front.

Cartographic Grid

This illustrates the extent of space covered by the grid as well as granularity of the grid.

Selecting the spatial calculation

You will evaluate Test_Flight's () distance as the spatial calculation against the volume grid.

Return to Volumetric1's () properties ().
Select the Spatial Calculation: check box.
Click the Spatial Calculation ellipsis ().
Select Test_Flight () in the Objects list in the Select Spatial Calculation for Volumetric1 dialog box.
Select Distance () in the Spatial Calculations for: Test_Flight list.
Click OK to close the Select Spatial Calculation for Volumetric1 dialog box.
Click Apply to accept your changes and to keep the Properties Browser open.

Computing Volumetric analysis

Volumetric analysis is likely to be more computationally expensive than 2D analysis because extending grids to three dimensions can greatly increase the number of grid points. You are performing a spatial analysis. This analysis provides satisfaction of spatial conditions that determines at any time which grid points are active and which are inactive.

Click Save () to save your scenario.
Bring the 3D Graphics window to the front to view your grid.
Select Volumetric1 () in the Object Browser.
Select the Volumetric menu item at the top of STK.
Select Compute in the shortcut menu.

Once the computation is completed, the entire grid volume will be filled with the color specified on the Volumetric1 3D Graphics - Volume page.

Volumetric 3D Graphics Volume

The Volumetric 3D Graphics Volume page is used to show the following:

Active grid points: All active grid points are included when evaluating volumetric data.
Spatial Calculation Levels: These levels represent straight line distances from the parent object.

Return to Volumetric1's () properties ().
Select the 3D Graphics - Volume page.
Notice that this color corresponds to active grid points.

All active grid points are included when evaluating volumetric data. This may not always be the case, which is discussed in subsequent exercises.

Select the Spatial Calculation Levels option.
Click Insert Evenly Spaced Values... .
Recall that your spatial calculation was for Test_Flight's () distance which is the default unit in in the Insert Evenly Spaced Values dialog box.
Enter the following values:

Option	Value
Start Value:	0
Stop Value:	16
Step Size:	4

Click Create Values .
Click Apply to accept your changes and to keep the Properties Browser open.

Volumetric 3D Graphics Legends

The Volumetric 3D Graphics Legends page is used to embed a custom legend in the 3D Graphics window.

Select the 3D Graphics - Legends page.
Select the Fill Legend tab.
Select the Show Legend check box.
Type Straight Line Distance (km) in the Title: field of the Text Options frame.
Enter 0 in the Number Of Decimal Digits: field.
Enter 50 in the Color Square Width (pixels): field of the Range Color Options frame.
Click Apply to accept your changes and to keep the Properties Browser open.

Viewing the changes in the 3D Graphics window

You are ready to obtain situational awareness in the 3D Graphics window

Bring the 3D Graphics window to the front.
Click Properties () in the 3D Window toolbar.
Select the Details page when the Properties Browser opens.
Select the Enable check box in the Label Declutter frame.
Click OK to accept your changes and to close the 3D Graphics window properties.
Use your mouse to explore the view and the grid.

spatial analysis Volumetric grid

Notice that concentric circles of different colors appear on the outside of the grid.
Zoom in and out and rotate the view to observe how colors appear on the outside from different directions and how they change on the inside.

These colors represent a straight line distance from Test_Flight () to the volume grid.

Double click on a few points inside the grid to get the exact values.
Close the grid point information window when finished.
Zoom out so that you can see the entire grid.
Click Decrease Time Step () in the Animation toolbar and set your Time Step: to 0.10 sec.
Click Start () to animate the scenario.
Notice how the straight line distance graphics for Test_Flight () changes over time.
Click Reset () when you are finished.

Changing the Spatial Calculation

You will evaluate Ground_Sites's () altitude as the spatial calculation against the volume grid.

Return to Volumetric1's () properties ().
Select the Basic - Definition page.
Click the Spatial Calculation: ellipsis ()
Select Ground_Site () in the Objects list in the Select Spatial Calculation for Volumetric1 dialog box.
Select Altitude () in the Spatial Calculations for Ground_Site list.
Click OK to close the Select Spatial Calculation for Volumetric1 dialog box.
Click Apply to accept your changes and to keep the Properties Browser open.

Updating the legend

Select the 3D Graphics - Legends page.
Type Ground Site Altitude (km) in the Title: field of the Text Options frame.
Click OK to accept your changes and to close the Properties Browser.

Viewing the changes in the 3D Graphics window

Bring the 3D Graphics window to the front.

Ground Site spatial analysis

The grid volume is filled with horizontal layers of colors, each representing a different vertical distance value.

Using a Spatial Calculation based on Condition Satisfaction

In addition to directly limiting which grid points are considered for volumetric computations, spatial conditions can also produce calculations based on their satisfaction intervals. This can be accomplished by using a type of Spatial Calculation called Spatial Condition Satisfaction Metrics.

Right click on GS_FOV () in the Object Browser.
Select Analysis Workbench… () in the shortcut menu.
Select the Spatial Analysis tab in the Analysis Workbench.

Creating a new spatial calculation

A spacial calculation is a calculation that depends on both time and location.

Click Create new Spatial Calculation ().

Setting the Spatial Condition Satisfaction Metrics

The spatial calculation is defined as various metrics derived from satisfaction intervals computed for the specified spatial condition.

Click Type: Select... in the Add Spatial Analysis Component dialog box.
Select Spatial Condition Satisfaction Metrics () in the Select Component Type list in the Select Component Type dialog box.
Click OK to close the Select Component Type dialog box.
Type AccumulatedVisibilityDuration in the Name: field when you return to the Add Spatial Analysis Component dialog box.

Setting a Spatial Condition

A spatial condition is a scalar condition that depends on both time and location.

Click the Spatial Condition: ellipsis ().
Select GS_FOV () in the objects list in the Select Reference Spatial Condition dialog box.
Select Visibility () in the Spatial Conditions for: GS_FOV list.
Click OK to close the Select Reference Spatial Condition dialog box.
Set the following when you return to the Add Spatial Analysis Component dialog box:

Option	Value
Satisfaction Metric:	Interval Duration
Duration Type:	Sum
Accumulation Type:	Up To Current Time
Filter:	None

Click OK to close the Add Spatial Analysis Component dialog box.
Click Close to close the Analysis Workbench.

Resetting the Volumetric spacial calculation

You need to add your new components to Volumetric1 ().

Open Volumetric1's () properties ().
Select the Basic - Definition page when the Properties Browser opens.
Click the Spatial Calculation: ellipsis ().
Select GS_FOV () in the Objects list in the Select Spatial Calculation for Volumetric1 dialog box.
Select AccumulatedVisibilityDuration () in the Spatial Calculations for: GS_FOV.
Click OK to close the Select Spatial Calculation for Volumetric1 dialog box.
Click Apply to accept your changes and to keep the Properties Browser open.

When you click Apply, Volumetric1 () will recompute automatically.

Resetting volume graphics

After recomputing the analysis, you need to reset your volume graphics.

Select the 3D Graphics - Volume page.
Click Insert Evenly Spaced Values... .
Notice the minimum and maximum times in the Limits frame.

You can use these times when setting up contours although rounding up or down is often done.

Enter the following values in the Insert Evenly Spaced Values dialog box.

Option	Value
Start Value:	0
Stop Value:	30
Step Size:	3

Click Create Values .
Click Apply to accept your changes and to keep the Properties Browser open.

Updating the 3D Graphics legend

Update the 3D Graphics window legend to match your changes.

Select the 3D Graphics - Legends page.
Type Sensor Duration (seconds) in the Title: field of the Text Options frame.
Click OK to accept your changes and to close the Properties Browser.

View the changes in the 3D Graphics window

You are showing an accumulation of time of when GS_FOV () accesses points in the grid.

Bring the 3D Graphics window to the front.
Click Start () to animate your scenario.
Watch as the grid continuously updates based on accumulated time.

sensor accumulated duration

Click Reset () when finished.

Using a Constrained Grid

A constrained grid provides an opportunity to dynamically restrict analysis to within certain time and spatial limits as dictated by a selected spatial condition, while still retaining the regular lattice structure of the underlying grid.

Right click on Test_Area () in the Object browser.
Select Analysis Workbench… () in the shortcut menu.
Select the Spatial Analysis tab in the Analysis Workbench.
Click Create new volume grid ().

Creating a Constrained Grid

A Constrained Grid is a volume grid in which the grid points from a reference grid are available only when the spatial condition is satisfied.

Click Type: Select... in the Add Spatial Analysis Component dialog box.
Select Constrained () in the Select Component Type list in the Select Component Type dialog box.
Click OK to close the Select Component Type dialog box.
Type SimpleCartographicFOV in the Name: field when you return to the Add Spatial Analysis Component dialog box.

Setting the Reference Grid

Click the Reference Grid: ellipsis ().
Select Test_Area () in the Objects list in the Select Reference Volume Grid dialog box.
Select SimpleCartographic () in the Volume Grids for: Test_Area list.
Click OK to close the Select Reference Volume Grid dialog box.

Setting the Spatial Condition

Click the Spatial Condition ellipsis ().
Select GS_FOV () in the Objects list in the Select Reference Spatial Condition dialog box.
Select Visibility () in the Spatial Conditions for: GS_FOV list.
Click OK to close the Select Reference Volume Grid dialog box.
Click OK to close the Add Spatial Analysis Component dialog box.
Click Close to close the Analysis Workbench.

Using the constrained grid in the Volumetric object

Open Volumetric1's () properties ().
Select the Basic - Definition page when the Properties Browser opens.
Click Volume Grid: ellipsis ().
Select Test_Area () in the Objects list in the Select Volume Grid for Volumetric1 dialog box.
Select SimpleCartographicFOV () in the Volume Grids for: Test_area list.
Click OK to close the Select Volume Grid for Volumetric1 dialog box.
Click Apply to accept your changes and to keep the Properties Browser open.

Updating the grid volume colors

The colors used for duration no longer apply. Go ahead and remove them.

Select the 3D Graphics - Volume page.
Select the Active Grid Points option.
Click Apply to accept your changes and to keep the Properties Browser open.

Removing the legend from the 3D Graphics window

The legend in the 3D Graphics window doesn't match your changes. Go ahead and remove it.

Select the 3D Graphics - Legends page.
Select the Fill Legend tab.
Clear the Show Legend check box.
Click OK to accept your changes and to close the Properties Browser.

Viewing the changes in the 3D Graphics window

Bring the 3D Graphics window to the front.

sensor constrained grid

Click Start () to animate your scenario.

The multi-color display representing levels of spatial calculation are replaced with a single color corresponding to active grid points.

Click Reset () when finished.

Analyzing the grid

You can analyze the grid to see what percentage of the grid is accessed by GS_FOV ().

Right click on Volumetric1 () in the Object Browser.
Select Report & Graph Manager... () in the shortcut menu.
Select the Satisfaction Volume () report in the Installed Styles () list when the Report & Graph Manager opens.
Click Generate... .
The % Satisfied is showing a value of approximately 1.7 percent.
Close the report and the Report & Graph Manager.

Using Spatial Conditions for a Constrained Grid

You can create new spatial conditions using various operations provided in Analysis Workbench. Any of these user defined conditions can be used to constrain a grid.

Right-click GS_FOV () in the Object browser.
Select Analysis Workbench… () in the shortcut menu.
Select the Spatial Analysis tab in the Analysis Workbench.
Select GS_FOV () in the Objects list.
Click Create new Spatial Condition ().
Click Type: Select... in the Add Spatial Analysis Component dialog box.
Select Over Time () in the Select Component Type list in the Select Component Type dialog box.
Click OK to close the Select Component Type dialog box.
Type VisibilityOverTime in the Name: field when you return to the Add Spatial Analysis Component dialog box.

Original Spatial Condition

Check that Original Spatial Condition: shows Ground_Site/GS_FOV Visibility.

Reference Intervals

Click the Reference Intervals: ellipsis ().
Select GS_FOV () in the Objects list in the Select Reference Interval List dialog box.
Select AvailabilityTimeSpan () in the Components for: GS_GOV list.
Click OK to close the Select Reference Interval List dialog box.

Duration Type

Keep the default Duration Type: of Static.
Click OK to close the Add Spatial Analysis Component dialog box.

Adding a New Volume Grid

You can create another constrained grid that uses the spatial condition of visibility over time. This evaluates the satisfaction of the spatial condition over specified intervals of time.

Select Test_Area () in the Objects list.
Click Create new Volume Grid ().
Click Type: Select... in the Add Spatial Analysis Component dialog box.
Select Constrained () in the Select Component Type dialog box.
Click OK to close the Select Component Type dialog box.
Type SensorVisOverTime in the Name: field in the Add Spatial Analysis Component dialog box.

Reference Grid

Click the Reference Grid: ellipsis ().
Select Test_Area () in the Objects list in the Select Reference Volume Grid dialog box.
Select SimpleCartographic () in the Volume Grids for: Test_Area list.
Click OK to close the Select Reference Volume Grid dialog box.

Spatial Condition

Click the Spatial Condition: ellipsis ().
Select GS_FOV () in the Objects list in the Select Reference Spatial Condition dialog box.
Select VisibilityOverTime () in the Spatial Conditions for: GS_FOV list.
Click OK to close the Select Reference Spatial Condition dialog box.
Click OK to close the Add Spatial Analysis Component dialog box.
Click Close to close Analysis Workbench.

Updating Volumetric1's properties

Open Volumetric1's () properties ().
Select the Basic - Definition page when the Properties Browser opens.
Click the Volume Grid: ellipsis ().
Select Test_Area () in the Objects list in the Select Volume Grid for Volumetric1 dialog box.
Select SensorVisOverTime () in the Volume Grids for: Test_Area list.
Click OK to close the Select Volume Grid for Volumetric1 dialog box.
Click OK to accept your changes and to close the Properties Browser.

Analyzing the grid

You can analyze the grid to see what the accumulated percentage of the grid is accessed by GS_FOV ().

Right click on Volumetric1 () in the Object Browser.
Select Report & Graph Manager... () in the shortcut menu.
Select the Satisfaction Volume () report in the Installed Styles () list when the Report & Graph Manager opens.
Click Generate... .
The % Satisfied is showing a value of approximately 25 percent of accumulated coverage
Close the report and the Report & Graph Manager.

Using a Geographically Constrained Grid

You can define Area Target () objects in STK and then use them to define spatial conditions that geographically restrict volume grids.

Right click on Test_Area () in the Object browser.
Select Analysis Workbench… () in the shortcut menu.
Select the Spatial Analysis tab in the Analysis Workbench.
Select Test_Area () in the Objects list.
Right click on SimpleCartographic () in the Components for: Test_Area list.
Select Properties... () in the shortcut menu.
Select the Constrain active grid points within Area Target check box in the Edit Component Dialog box.
Click OK to close the Edit Component Dialog box.
Click Close to close the Analysis Workbench.

Updating the 3D Graphics view

Open Volumetric1's () properties ().
Select the 3D Graphics - Grid page.
Clear the Show Grid check box.
Select the 3D Graphics - Volume page.
Select the Spatial Calculation Levels option.
Click OK to accept your change and to close the Properties Browser.

Recomputing Volumetric Analysis

Your square grid flowed outside of Test_Area () which is an ellipse. By selecting Constrain active grid points within Area Target check box in the Edit Component Dialog box, you confined your analysis to only those points inside of Test_Area ()

Select Volumetric1 () in the Object Browser.
Open the Volumetric menu item.
Select Compute in the shortcut menu.

View the changes in the 3D Graphics window

When you return to the 3D Graphics window, you will see the area covered by GS_FOV () is confined to Test_Area ().

Click Start () to animate the scenario.

Accumulated coverage inside the area target

The new volumetric display restricts all colors to within an elliptical cylinder limited by the elliptical shape of Test_Area ().

Creating a Spherical grid for Test_Flight

In the Spherical grid the coordinates are azimuth, elevation and the Range Reference Coordinate System from the Vector Geometry Tool.

Right click on Test_Flight () in the Objects list.
Select Analysis Workbench… () in the shortcut menu.
Select the Spatial Analysis tab in the Analysis Workbench.
Select Test_Flight () in the Objects list.
Click Create new Volume Grid ().
Click Type: Select... in the Add Spatial Analysis Component dialog box.
Select Spherical () in the Select Component Type list in the Select Component Type dialog box.
Click OK to close the Select Component Type dialog box.
Type SimpleSphere in the Name: field when you return to the Add Spatial Analysis Component dialog box.

Setting Grid Values

Click Set Grid Values... .
Enter the following when the Grid Values dialog box opens:

Field Name	Elevation	Range
Minimum	-90 deg	0.5 km
Maximum	90 deg	1 km
Number of Steps	18	1

Click OK to accept your changes and to close the Grid Values dialog box.
Click OK to close the Add Spatial Analysis Component dialog box.
Click Close to close the Analysis Workbench.

Using a Grid Attached to a Moving Object

You can define Volumetric () objects using volume grids attached to moving objects.

Clear the check box next to Volumetric1 () in the Object Browser.
Insert a Volumetric () object using the Insert Default () method.
Open Volumetric2's () properties ()
Select the Basic - Definition page when the Properties Browser opens.
Click the Volume Grid: ellipsis ().
Select Test_Flight () in the Objects list in the Select Volume Grid for Volumetric2 dialog box.
Select SimpleSphere () in the Volume Grids for: Test_Flight list.
Click OK to close the Select Volume Grid for Volumetric2 dialog box.
Select the Spatial Calculation: check box.
Click the Spatial Calculation: ellipsis ().
Select GS_FOV () in the Objects list in the Select Spatial Calculation for Volumetric2 dialog box.
Select AccumulatedVisibilityDuration () in the Spatial Calculations for: GS_FOV list.
Click OK to close the Select Spatial Calculation for Volumetric2 dialog box.
Click Apply to accept your changes and to keep the Properties Browser open.

Computing Volumetric2

Select Volumetric2 () in the Object Browser.
Select the Volumetric menu item.
Click Compute in the shortcut menu.

Evaluation of new volumetric data over time and across the grid is initiated and the Progress indicator is displayed.

Clearing the grid points for better visibility

Select the 3D Graphics - Grid page.
Clear the Show Grid check box.
Click Apply to accept your changes and to keep the Properties Browser open.

Creating new volume colors

Select the 3D Graphics - Volume page.
Select the Spatial Calculation Levels option.
Click Insert Evenly Spaced Values... .
Enter the following values in the Insert Evenly Spaced Values dialog box:

Option	Value
Start Value:	0
Stop Value:	15
Step Size:	3

Click Create Values .
Click Apply to accept your changes and to keep the Properties Browser open.

Creating a legend

Select the 3D Graphic - Legends page.
Select the Fill Legend tab.
Select the Show Legend check box.
Type Test Flight Accumulated Visibility (sec) in the Title: field in the Text Options frame.
Enter 0 in the Number Of Decimal Digits: field.
Enter 50 in the Color Square Width (pixels): field in the Range Color Options frame.
Click OK to accept your changes and to close the Properties Browser.

Viewing changes in the 3D Graphics window

Bring the 3D Graphics window to the front.
Zoom To Test_Flight ().
Use your mouse to zoom out until you can see the sphere surrounding Test_Flight ().

Aircraft visibility grid

Click Start () to animate the scenario.
Let the animation run until it stops.
Observe how accumulated GS_FOV () visibility to grid points surrounding Test_Flight () evolves over time.

sensor accumulated visibility

Save your work

Close any open reports, properties and the Report & Graph Manager.
Save () your work.

Summary

This was a very comprehensive tutorial used to introduce you to the Volumetric object and the Analysis Workbench Spatial Analysis tool. You learned how to create various grids and set the grid properties based on elevation and altitude. You applied these volume grids to the Volumetric object. You created various Spatial Calculations and Conditions, applied them to the Volumetric object and computed Volumetric analysis. You learned how to create contours based on the different computations and embed them in the 3D Graphics window. You also learned how to obtain Volumetric object data using the Report & Graph Manager.