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Beginning. Basic step-by-step demonstration for: Obtaining Basefile from CORS or local GPS web sites Using basefiles for Differential Correction of Trimble Rover files (.ssf) using Pathfinder Office. overview.

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Presentation Transcript
Beginning
Beginning

  • Basic step-by-step demonstration for:

  • Obtaining Basefile from CORS or local GPS web sites

  • Using basefiles for Differential Correction of Trimble Rover files (.ssf) using Pathfinder Office


Overview
overview

Differential correction compares and corrects your Rover file using a Base file, from a stationary base station receiver (at a known location) for the exact same time as your Rover file.

The first step is to obtain a base file. The most common source are CORS web sites.

Even though we may not use a CORS site, it is important to be familiar with the CORS format…





Use skagit instead
Use skagit instead

HOWEVER:

For local GPS work (within Whatcom County), the Skagit County GPS base station is supperior:

Closer

5 second sampling interval (Whidbey CORS is 30 second)

So… use their site instead










15 zip file
15 zip file

Double click to open



17 extract to base
17 extract to base

Extract to C:/Pfdata/default/base folder


18 base file
18 base file

Base file in Base folder…


Pathfinder
Pathfinder

Now, having downloaded a base file for the correct time period, a Rover file can be corrected using Pathfinder office…


1 windows
1 Windows

Open Pathfinder office




19 pathfinder
19 Pathfinder

Add your GPS data



19 open rover file
19 open Rover file

Open Uncorrected Rover file in Pathfinder


19 opened file1
19 Opened file

Uncorrected Rover file


20 util
20 Util

Differentially correct your Rover file using the corresponding base file



wait

Wait for the Differential Correction window to open… for some reason this seems to take a few minutes.






25 smart code ok
25 smart code ok

Use Smart Code and Carrier Phase Processing



27 open files
27 open files

Compare corrected and uncorrected files


28 open both files
28 Open both files

Open both original Uncorrected rover file

And corrected file for comparison.


29 zoom
29 zoom

Drag a box with zoom tool


30 close up of both
30 close up of both

Compare the two files…


Export em
Export ‘em

Both the uncorrected Rover file and the corrected file can be exported to ArcView shapefiles for GIS use and spatial analysis…

(see GPS_PF-AV_demo.ppt…)


fini

fini


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