Extract Coordinate Observations
The Extract obs... button on the Project/Tools tab is used to extract a set of adjusted coordinates and corresponding covariance matrix from an adjusted network.
The extracted data is formatted into a set of GeoLab input text records that can be used as observations in another adjustment The GeoLab Coordinate Observations Extraction dialog box is presented which contains the following controls:
GeoLab Adjustment File Group Box: This group box displays the file name of the GeoLab adjustment from which the extraction will be made. The Browse button allows you to set or change the adjustment file.
Selected Stations Group Box: This group box displays a list of stations in the selected adjustment file. You can click on a station name in the list to toggle its selection on and off. The Select All button selects all stations in the list. The Select None button deselects all stations in the list. The Toggle Selections button selects all non-selected stations and deselects all selected stations.
Output Type (Dimension) Group Box: This group box allows you to choose the type of coordinate observation record to place in the coordinate observation set. You can choose from the following types: 1D EHGT Records (Ellipsoidal height records); 2D PL Records (Latitude (phi) and longitude (lambda) records with the covariance matrix in the LG system); 3D PLH Records (Latitude (phi), longitude (lambda), and ellipsoidal height (h) records with the covariance matrix in the LG system); 3D XYZ Records (CT X, Y, Z coordinates with the covariance matrix in the CT system).
Use Variance Factor Check Box: This check box controls whether the estimated variance factor of the adjustment is used to scale the extracted covariance matrix. If checked, the covariance matrix is scaled, otherwise the variance factor is not used.
Save Station Selections Button: This button is enabled when you have at least one station selected in the stations list. The names of all selected stations are written to the specified file so that you can later reload them (using the Load Station Selections button).
Load Station Selections Button: This button is used to load a previously-saved (with the Save Station Selections button) stations selections file. When the file is loaded, all stations in the stations list are deselected, then any station names found in the file are selected.
Extract Button: This button closes this dialog and inserts the specified observation set records into a new text tab.
Close Button: This button closes this dialog without extracting the observation set records.
Help Button: This button displays this information.