3D Point Node

After Import 3D Points via Menu File, Import 3D Points (with selection of the coordinate system, eventually selecting hemisphere and zone or central meridian and latitude of origin), a 3D point node icon will appear on the Barista thumbnail view.

3D point node icons:, , , , , , , , ,

Double Click on the 3D point icon opens a 3D point table in the Barista workspace.

3D point node popup menu

Right Click on the 3D point icon opens a 3D point icon popup menu with the following options:

• 3D to 2D with options

  • with RPC
  • with Affine
  • with TFW

• Control with options

  • set Control to make a 3D point set the set of control points that are to be used in adjustment. There can only be one set of control points in Barista, and its icon will be highlighted in green colour. Selecting a 3D point set to be the set of control points in adjustment will unselect any set of control points selected previously. Note that if no control point set has been selected, no adjustment can be carried out.

  • unset Control to unselect the current control point set (as indicated by the green colour of its icon). If you use the unset Control function, no other 3D point set will be automatically set to be the control point set, which means that the user will not be able to carry out any adjustment before selecting another 3D point set as the control point set.

• Set XYZPoints Reference System: This option will open a dialog for setting the coordinate type and parameters defining the geodetical datum and grid projection of the points.

• Open Point Selector: This option will open Object Selector Dialog. This is useful for inspecting points and for selecting points for digitization.

• Transform 3D Points with options

  • Geographic
  • Geocentric
  • UTM
  • TM

• Export the 3D points in any of three formats:

  • Space separated text file: each point will be written to that file in the format
    Label X Y Z sigmaX sigmaY sigmaZ
    separated by space characters.

  • Comma separated text file: each point will be written to that file in the format
    Label,X,Y,Z,sigmaX,sigmaY,sigmaZ
    separated by commas.

  • DD.MMSSsss Text file (geographic coordinates only): each point will be written to a space separated text file in the format
    Label Phi Lambda Z sigmaPhi sigmaLambda sigmaZ
    separated by space characters. However, the angles Phi and Lambda will be given in the format DD.MMSSsss, where DD are the degrees, MM are the arc minutes, SS are the full arc seconds, and sss is the fraction of the arc second, i.e., the number of arc seconds would be 'SS.sss'.

• Interpolate DEM: This option, only available with points in grid coordinates, will open a DEM interpolation dialog for interpolating a DEM grid from the 3D points.

Change Sigma from the 3D point icon opens a Change XYZ Sigma dialog. This sets the point sigmas of all 3D points of this 3D point node to the values entered in the dialog box. The units of the standard deviations are always [m]. For geographical coordinates, the actual units of latitude and longitude will be computed by assuming the standard deviations provided by the user to be arcs on a circle whose radius is identical to the average earth radius.

Change XYZ sigmas

Changing the sigmas of single points or a selection of points is possible through the right click popup option of a XYZ point table. Deleting of single points or a selection of points is also possible via the XYZ point table. The sigmas of single points can also be directly entered in the corresponding cells. In addition it is possible to edit the point label via the label column. The units of the standard deviations are always [m]. Of course, for adjustment, these standard deviations will be converted to the actual observation units, i.e., [deg] in the case of geographical coordinates.

XYZ point table, right click on selection

The object selector dialog just displays a list of all point identifiers. If a point is selected with the mouse, it will be highlighted in all images currently displayed. More importantly, if the digitizing mode or the matching mode are selected, a double click on a point in the object selector will set the label of the selected point as the current label for all displayed images, and the images will be zoomed to the approximate position of the back-projected 3D point.

The object selector dialog

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