1GIS Post-Processing - Technical Presentation - September, 2010

MOBILEMAPPER FIELD

MOBILEMAPPER 6

MOBILEMAPPER OFFICE

GIS POST-PROCESSING

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PREPARATION– Power, USB/PC cable, Active Sync Connection

– Install MobileMapper Today on MobileMapper 6 ftp://ftp.ashtech.com/Mobile Mapping/MobileMapper 6/Software/Mobil

eMapper Software/MobileMapper Today/MobileMapper Today.zip

File on FTP site is zipped and must be extracted prior to installation

Execute MobileMapperTodaySetup.exe file on PC while MobileMapper 6 is connected via ActiveSync

MobileMapper Today is installed on to PC and then on to the MobileMapper 6

– Install MobileMapper Office on PC ftp://ftp.ashtech.com/Mobile Mapping/MobileMapper 6/Software/Mobil

eMapper Software/MobileMapper Software.zip

File on FTP site is zipped and must be extracted prior to installation

Execute Setup.exe file on PC to install MobileMapper Office to PC

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PREPARATION (Continued)– Install MobileMapper Field on MobileMapper 6

ftp://ftp.ashtech.com/Mobile Mapping/MobileMapper 6/Software/MobileMapper Software/MobileMapper Software.zip

File on FTP site is zipped and must be extracted prior to installation

Execute Setup.exe file on PC to install software while MobileMapper 6 is connected via ActiveSync and install the MobileMapper Field software to MobileMapper 6. MobileMapper Field is installed to the PC and then on to the MobileMapper 6

– Versions MobileMapper Today (MobileMapper 6) – V 1.0.0.15

MobileMapper Office (PC) – V 1.0.1.3

MobileMapper Field (MobileMapper 6) – V 1.00

GNSS Toolbox (MobileMapper 6) – V 1.00

Installed as part of MobileMapper Field

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PREPARATION (Continued)

– Licensing

MobileMapper Office (PC) requires no license

MobileMapper Field (MobileMapper 6) must be licensed with

activation code

Program will not open without license

Post-processing for MobileMapper Field must be licensed with

activation code

Code requested when selecting “Record raw data for post-

processing” box inside the “Recording” tab under the “Options”

dialogue boxes

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OUTDOOR FUNCTIONALITY TESTS

– Outdoors cannot be simulated using GNSS Toolbox

– Satellites tracking

– Raw data logging – Has this option been licensed and is there

sufficient memory?

– Ground truth against known data – Does the computed position

appear correct?

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DATA COLLECTION

– Advice

Software activation codes require the user to put the MobileMapper 6

into suspend mode or the code will be lost. With that task done once,

it can be powered on and off without losing the code.

Use MobileMapper Today to set the clock every time it is turned on to

ensure that the clock is set properly before using MobileMapper Field.

It is the first clue that the MobileMapper 6 is ready for work.

Manually setting the clock does not ensure that the clock is set

properly.

Good PDOP does not ensure good accuracy. Consider the quality of

the GPS signal. One customer who complained about accuracy sent

photos showing the receivers lying on the ground. Signals bouncing

off the ground are multipath.

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DATA COLLECTION (Continued)– Advice (Continued)

Do not expect CORS reference data on the same day of recording. Accuracy has as much to do with the 10 minutes before and after the

feature was recorded as it does the ten seconds spent recording a point feature.

– Common mistakes and things you should NOT do: Raw data recording begins before the clock is set or before there is a

stable DGPS solution. Raw data recording is halted between feature mapping resulting in

dozens of tiny raw data files, none of which will process properly. Raw data recording of such short duration that it will not process.

Many of these contain ephemeris files too tiny to have recorded the current ephemeris. Good rule of thumb is that a file less than 20 minutes long is wasted effort.

Feature mapping that begins within seconds of starting the raw data recording.

Put receiver in pocket while walking between features to be logged..

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DATA COLLECTION (Continued)– Orient GPS unit against the local sky

Ensure satellite tracking

Ensure DGPS solution if in an SBAS coverage area

– MobileMapper Field basics Main screen

Position icon

DOP

Solution type

Easting/Northing

Scale

Menu

Log

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DATA COLLECTION (Continued)– MobileMapper Field basics (Continued)

Menu

Pause/Resume

Stop

Layers

Job

Options

Status

Exit (not the “X”)

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DATA COLLECTION (Continued)– Create New Job

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DATA COLLECTION (Continued)– Create New Layer

Point Feature

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DATA COLLECTION (Continued)– Create New Layer (Continued)

Point Feature (Continued)

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DATA COLLECTION (Continued)– Add another layer

Line Feature

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DATA COLLECTION (Continued)– Add another layer (Continued)

Line Feature (Continued)

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DATA COLLECTION (Continued)– Add another layer (Continued)

Polygon Features

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Data Collection (Continued)

– Turn on raw data recording

Menu / Options

Choose memory location

Check box and then OK

Wait a few minutes in clear view of

the sky before recording features.

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Data Collection (Continued)

– Collect (Log) four points describing a rectangle

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Data Collection (Continued)

– Collect (Log) four points describing a rectangle (Continued)

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Data Collection (Continued)

– Collect (Log) four lines describing the same rectangle

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Data Collection (Continued)

– Collect (Log) a polygon describing the same rectangle

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Data Collection (Continued)

– Turn off raw data recording

Wait a few minutes after recording

last feature

Menu / Options

Deselect check box and then OK

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Post-Processing– Submit raw data files to Joe Sass for pre-analysis

jsass@ashtech.com All shape files (*.shp, *.prj, *.shx, *.dbf) in targeted directory GPS Raw Data in its own folder (*.grw and *.crw) Reference data – Preferably 1 second data rate

Rinex data from local CORS

“G” file from ProMark/ProFlex 500 base station

– Create new or open existing Map project in MobileMapper Office– Activate collected SHP files from the data collector– Import Rover raw data from the data collector– Import Reference raw data from file or internet– Enter correct reference station position– Post-process data– Export or transfer data to destination software

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Follow-up webinar scheduled for…

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