Calculate the Inverse Between Points

Calculate and report some or all of the following inverse values between any two points in your project:

Grid and geodetic azimuth
Grid, ellipsoid, and ground distance
Change in elevation and height

Prerequisites:

None.

To calculate the inverse between two points:

Select Inverse to display the Inverse command pane.
Select one of the following measurement methods:
- Sequential - Calculates cumulative values between more than two points.
- Radial - Calculates values repeatedly from one point to multiple other points.

If you are calculating the inverse using a Station View with scan points, check the Virtual DR check box located at the bottom of the tab.
This allows you to use the Pixel Picker to select on a referenced photo image the location (pixel) where you want to create an inverse point. TBC then projects a nearby scan point onto the line-of-sight ray to help calculate the 3D position of the new point. If there are no nearby scan points, an appropriate error message is displayed and you will need to make a new selection.
More about using the Pixel Picker...
When using the Pixel Picker to make a photogrammetry observation or select a scan point, note the following:
- Toggle between the two Pixel Picker display options – dynamic view and static view – by pressing Ctrl + Shift.
  The dynamic view option causes the Pixel Picker to display as a magnifier with a reticle, enabling you to dynamically select the precise location for a photogrammetry observation on the photo image. To change the reticle for the Pixel Picker , press Ctrl + Alt.
  The static view option causes the Pixel Picker to display as a small selection cursor that, when clicked, opens a window with a magnified view of the photo image showing the selected area. You can then select the precise location for a photogrammetry observation on the photo image in the magnified view.
- To change the size of the Pixel Picker , or to specify to display only grayscale images in the selector, see Photogrammetry Options.
- Use your mouse wheel to zoom in or out. Press the mouse wheel and move your mouse to move the image on the Station View tab.
- Once the Pixel Picker is close to the object you want to select, you can press the arrow keys on your keyboard to move it in small increments. When you are ready to make your selection, press your left mouse button or press the Enter key.
Note: Before using the Virtual DR feature, it is highly recommended that you register the scans in your project. Once the scans are registered, you can select to view all of the scan points in the project on any Station View tab and TBC can then use any of them for the Virtual DR measurement. Just click the View Filter icon located at the bottom of the tab and check the Show scans for other stations check box.
Click in the From field, and then either click the "from" point in a graphic view or type a point ID (name) or coordinate (Plan View only; use the format X,Y) in the field.
You can pick either a named survey or CAD point, or an unnamed scan point. If the Free option is checked in the Snap Mode dialog and you are making your selection on the Plan View tab, you can also pick a location where there is no point (not applicable on a 3D View or Station View tab). In this case, only 2D inverse values are calculated.
Note: To view the Snap Mode dialog, click the Show Snap Options icon located on the Inverse command pane toolbar.
You can also right-click in the view to access COGO controls and snaps when picking points or locations.
Pick a second point or type a point ID or coordinate (Plan View only) in the To field.
The point IDs, or Free, display in the Reported Points list, and the calculated inverse values display in the Details group.
Free displays in the Reported Points list if you have selected an unnamed scan point or a location where there is no scan point (only on the Plan View tab when the Free option is checked in the Snap Mode dialog).
Note: When a combined scale factor has been defined using the Labeling Scale Factor command, both a geodetic and a planar ground distance are displayed in the Details group. A geodetic ground distance is the traditional Inverse ground distance based on the earth's curvature. A planar ground distance uses a single, project-wide combined scale factor. When a combined scale factor is not defined using the Labeling Scale Factor command, only a geodetic ground distance is displayed.
To calculate additional inverses, continue picking To points.
To review the details for any inverse, select it in the Reported Points list.
To change inverse report options, click the Report Options icon to display the Report Options command pane. When you are done, click OK to return to the Inverse command.
To generate the Inverse Results report, click the Show Report icon at the top of the Reported Points group. The Inverse Results report displays in your default web browser.
Note: If no coordinate system is defined, the Select Coordinate System dialog displays. Define a coordinate system and run the report again.
When you are done, click Close in the Inverse command pane.