LGO Software

Add UTM coordinate system

Tools > Coordinate System Management

Click on the Projection folder

Right pane: right-click > New…

Parameters:

• Name: UTM33
• Type: UTM
• Zone Number: 33
• Hemisphere: Northern

Click on the Coordinate Systems folder

Right pane: right-click > New…

Parameters:

• Name: WGS84-UTM33X
• Transformation: None
• Local Ellipsoid: WGS 1984
• Projection: UTM33
• Geoid Model: None
• CSCS Model: None

Predefine your own points

You’ve defined points on a map and you want to import them in the rover. It’s done in two steps

1. Import ASCII data to LGO

Write point data in an ASCII file. 4 columns: pointID, Easting or , Northing, Height

Open LGO

From the menu bar, choose Import > ASCII Data…

choose your data file and press the Import button

Step 1 of 4: usually you choose Free (default)

Next

Step 2 of 4: choose the separator

Next

Step 3 of 4:

Coordinate type: choose grid (for UTM), geodetic (for longitude – latitude) or cartesian (X, Y, Z).

Then don’t forget to label the column names by right-clicking and choosing PointId, etc.

One column must contain the Point Id.

Next

Finish

2. Write project to CF-card

From the LGO menu bar, choose Tools > Project Management

Right-click the project where you imported your points > Send To > Hard disk > For system 1200/GPS 900…

Choose the DBX folder of the GPS job you want to import the data to

Import projects

This functionality is useful e.g. if you move your data to another computer with a new installation of LGO.

Choose Tools > Project Management

In the right part of the LGO window, right-click and choose Register…

Locate the folder of the project and click OK

You might have to edit the coordinate system in the project properties in order to see your points

Modify antenna height of a measured point

In the project, choose the View/Edit tab (window bottom). Right-click the point and choose Edit intervals…

Modify the antenna height and click OK.

GIS/CAD Export

Under Windows Vista LGO has problems handling “pre-defined” folders locations e.g. the Desktop-folder. To avoid this problem, export to a different folder.

The following explains how to export LGO points with empty Code fields. Such points are exported as CAD blocks. You need to create a DXF template that defines the layout of the blocks. LGO is shipped with 2 templates but they don’t work too well therefore I recommend you use a modified version found here.

Open a project with the points you want to export. All points will be exported. If you want to export only some points, create a new project and copy the points into it.

Choose Export > GIS/CAD Data…

Right-click in the Lookup Table field and choose New. Name the lookup table. Choose whether you want to export the points’ Point Id and Elevation fields. If you do, you will be able to display these value in your CAD program. Click on the AutoCAD settings tab and browse to the DXF export template. Click OK.

Click on the Settings… button. The Coord type must be Local and Grid. In the AutoCAD tab, choose any AutoCAD version and the dxf format. Click OK

Click on the Lookup… button. In the Code Defaults tab, select the Export Points without codes box. Click OK.

Choose a filename and click Save.

Because of a bug in the GIS/CAD export module, you need to modify the exported DXF file by hand. Open it in a text editor and if you’ve been using my template DXF, replace all occurrences of:

“Point Id” with “POINT_ID”
“Elevation” with “ELEVATION”

(remove the double-quotes)

If you’re using AutoCAD, do a ATTSYNC after you open the file. Choose Name then Point. This should display the points with the pointer in Layer 0, the Point Id in layer POINTID and the elevation in layer ELEVATION.

If you want to create your own DXF export template, make sure that the Point Id attribute tag must be POINT_ID and the elevation attribute tag must be ELEVATION. Otherwise the tags are lost in the export and you lose control over the attributes.

Useful stuff

Avg. Limit Exceeded

In the Points tab, right-click on a column header and choose ‘Columns…’. Select ‘Avg. Limit Exceeded’. The points where the value is ‘Yes’ have been measured twice and differ with more than the average limit set for the job. By right-clicking on the point and choosing ‘Properties…’ then the Mean tab, you can select which point you want to keep.

Ambiguity Status (post-processing)

In the Results tab, check that the value in the ‘Ambiguity Status’ column of the measured points is ‘yes’. It means the point was calculated correctly.

Height reading

In the GPS-Proc tab, the value in the ‘Measurement type’ column tells how the antenna height is calculated from the input value. For some equipment there is an angle between the antenna reference point and the measurement point. In that case the value is ‘Slope’ and the true height is corrected accordingly. Otherwise the value is ‘vertical’.

Check if equipment is GLONASS ready

USER > STAT > System information then go all the way down the list and check that both GLONASS field values are ‘Yes’.

GPS 1200 equipment

Exit Smartworx

Press Shift then F6 to exit Smartworx and get access to the operating system (Windows something)