MAGELLAN GPS Differential for Arc Pad User Guide

MAGELLAN GPS Differential for Arc Pad User Guide

Prerequisites

GPS Differential™ for ArcPad® requires that you have ESRI’s Arc Pad installed first on Mobile Mapper CX. The extension supports Arc Pad 7.1. Please refer to Arc Pad documentation for more information.

Installing GPS Differential™ for ArcPad®

1.  Insert the “GPSDifferential™ for ArcPad®” SD card into Mobile Mapper CX.
2. Using Windows Explorer, browse the SD card and copy the following files to the Mobile Mapper CX folders indicated below:
   • PostProc.apa to MyDevice/ESRI ArcPad 7.1/Applets
   • PostProc.vbs to MyDevice/ESRI ArcPad 7.1/Applets
   • PostProc.dll to MyDevice/ESRI ArcPad 7.1/Extensions

The first time you initiate the Start Logging GPS Raw Data function when beginning a post-processing differential job, you will be asked to input the activation code found on a separate sheet. This sheet (P/N 631309-98) is part of the supply.

Operating Requirements

No RTCM source, including Mobile Mapper Beacon, can be used with Mobile Mapper CX when using the post-processing extension.
The extension is designed in such a way that when you insert an SD card into the Mobile Mapper CX unit, raw data will automatically be logged on the SD card. In the absence of an SD card, raw data will be logged in the My Device folder.

Recommendations

1. Data collected by Mobile Mapper CX and data drawn in ArcPad should not be mixed in the same shapefile.
2. Data collected simultaneously by different Mobile Mapper CX receivers should be post-processed separately in Mobile Mapper Office.
3. If averaging is not used when collecting point data, it is recommended to remain static on the point for 10 seconds, then create the point and then remain on the point for a further 10 seconds.
4. ArcPad post-processing results saved in an MMJ job file in
   Mobile Mapper Office cannot be uploaded to Mobile Mapper or ProMark3. The job’s feature library can however be exported and uploaded to ProMark3 as an MMF file.

Logging Shapefiles with the Magellan Post-Processing Extension

1. Start ArcPad.

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2. In the ArcPad 7.1 tool bar, tap on the down arrow to the right of the GPS icon and then select the GPS Preferences option. Make the following settings:

   • Protocol: NMEA 0183
   • Port: COM2:GPS NMEA
   • Baud: 57600
     Tap OK to validate the settings and close the window.

3.  Activate the GPS section:

   • In the Arc Pad tool bar, tap on the down arrow to the right of the GPS icon and select GPS Active.

4. In the ArcPad tool bar, tap on the down arrow to the right of the Hammer/Wrench icon and select Start logging GPS Raw Data. Notice that once the raw data logging is activated, the command you have just selected is changed to Stop Logging GPS Raw Data.

5. Enable Arc Pad averaging: The post-processing extension works with or without the averaging being enabled in Arc Pad. In fact, Arc Pad averaging does not affect post processing results. However, to make sure the post-processing accuracy will be achieved, it is important that you stay at the collected point for at least 30 seconds to have adequate raw data collected.
   It is therefore recommended to enable the ArcPad averaging option and select at least 30 positions for point and vertex averaging. By doing this you will make sure that you actually stay at the point for at least 30 seconds. Remember the point is created at the end of the averaging interval so it is a good idea to stay on the point for about 10 seconds after the averaging screen is closed. To enable averaging:

   • In the Arc Pad 7.1 tool bar, tap on the down arrow to the right of the GPS icon and then select the GPS Preferences option.

   • Tap the Capture tab and make the required settings (see screen opposite). Tap OK to validate your settings and close the window.

6. Please refer to the Arc Pad User Manual to collect point, line and polygon features.

7. When enough data has been collected, do the following to stop data logging:

   • In the Arc Pad tool bar, tap on the down arrow to the right of the Hammer/Wrench icon.
   • Select Stop logging GPS Raw Data.

Post-Processing Shapefiles with Raw Data in Mobile Mapper Office

1. Install Mobile Mapper Office 3.40a.

2.  Copy the collected shapefiles to the PC.

3. Copy the raw data files to the PC. The naming convention for raw data files is: yymmddnn. RAW Where: yy: Year (e.g. “05”) mm: Month (e.g. “10”) dd: Day (e.g. “14”) nn: Index number that starts from “00” and is incremented by “1” every time a new file is created the same day.
   RAW: Filename extension.

4. Start Mobile Mapper Office

5. In the File menu, select Mobile Mapper CX post processing.
   

6. Add the shapefile collected in the field using the ArcPad and Magellan post-processing extension. You may use the Shift key to add more than one shapefiles.
   

7.  Add the raw data files. You may use the Shift key to add more than one raw data files.
   

8. Use the usual Mobile Mapper Office functions to add reference data.

9. Start the post-processing (same steps as when postprocessing field data collected with Mobile Mapper Pro).
   

(Refer to Mobile Mapper Office User Manual for more detail.)

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