Instructions are suitable for the Geo-Explorer 2, 3 and Pro-XL
Instructions for working with the .SSF format
- Hook-up your Trimble unit to the computer.
- Start Pathfinder Office. If pathfinder office is not installed see a Senior Lab Instructor.
- When Pathfinder Office opens, open your project space or set-up a new space (if necessary).
- Select Utilities – Data Transfer (wait for the unit to connect) Hint: If you do not establish a connection try using the other COM port.
- Highlight your file, they are usually indicated by the date and time they were made.
- Ensure that you have the right destination directory selected and select transfer.
Opening Your Files
- File open and select your file.
- Sometimes files will average all points into one point. This is a problem why the default would be to average all your points into one, however, there is a way of overcoming this situation.
- Select the one point, right click on it and select delete. Wait a couple of seconds and all your points will be redrawn (make sure to select view/autopan to selection and your zoom will be adjusted).
Converting Points to Lines
- To convert your points to lines you will have to use the grouping function. The grouping function is under Utilities – Grouping
- Ensure your input file is set properly
- Set your output file, the default name will be “grouped” so change it if you want something more specific.
- Wait for the processing to finish and then open the grouped file.
Exporting the Data
- Choose Utilities export.
- Set up your export parameters, choose your input and output parameters.
- Choose your export format. The Arc/info UNIX generate file format will work on our system.
- Set your Projection (e.g. UTM, zone 10, NAD83 Canada)
- If you want to have more input in your exporting options “change set-up options” This will open a number of menus where you can specify. However, the instructions below relate to Arc/Info.
- Your exported files will be in the export directory of your project space. (Unless you specify otherwise)
- Please note that the files exported are going to be exported in the format, which they were collected. For example if you collected point data your data is exported in point format even with the grouping options set on.
Examine the Arc/info UNIX Generate file
- Before you move the files over to Arc/Info take a closer look at the data.
- Open the windows/explorer and move to the export directory.
- There should be at least these files in this directory.
exp###a This is text document providing indicating such things as the number of points and to which new file format the Trimble file was converted in to. grouped (or user specified file name): This is another text file indicating information such as the number of points, projection, datum and date of your GPS file. posnpnt This is a short AML file to be run in Arc/Info that will build your coverage. Have a look at this AML. It will take a small amount of Arc/Info experience to know what it is doing. Change any of the parameter you feel necessary. posnpnt.pa This file contains attribute data to be added to your file. posnpnt.pts This file contains the actual points that are used in by the Generate command.
Using Your Arc/Info Generate files
- Use ftp and transfer the exported files into your Samson account. It will be easier to create a directory for the files to transfer into.
- Start-up arc and move to the directory with your files.
- At the arc prompt now run the AML &run posnpnt.aml
- List your coverage using the LC command and change the names using the rename command.
- Use ProjectDefine to define and specify the coverage projection. Define the projection the same was setup the export parameters.
Exporting your GPS files to Arc/View
- Choose Utilities – Export
- Set-up your input and out files.
- Specify Arc/View Shape file as your export file format
- Click on Change Set-up Options and make sure the set-up relates to your data. When finished close this box.
- Click okay in your export main box, and wait as your files are processing.
- FTP the Arc/View shp files and related files over to Samson.
- Start Arc/view and examine the data (Note the file type, i.e. Point Line Area, that was originally created, will remain in the output file)
If you have quite a few files to work with, consider using the batch processor. Utilities – Batch Processor: This will allow you to process a number of files at once.
Cleaning up GPS File in Arc/Edit
Often GPS data is made up of “jagged” lines with many misplaced and unwanted vertices, these lines can be cleaned up an made to look appealing using Arc/Edit. Arc/Edit has a number of tools that will help you clean up the vertices on a line. Before using these tools specify your editcoverage, editfeatures, the drawenvironment and finally select the arcs you wish to edit. The tools for cleaning up the lines are as follows:
Generalise: This will generalise your linework removing a number of vertices
Spline: Will add vertices to smooth the linework
Clean up your linework using different combinations of the above commands.