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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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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…


4 cors home

4 CORS home


5 cors data

5 CORS data


6 cors selected

6 CORS selected


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


7 skagit cors

7 skagit cors


8 skagit ssf

8 skagit ssf


9 skagit ssf list

9 skagit ssf list


10 skagit ssf select

10 skagit ssf select


11 skagit download

11 skagit download


12 c pfdata

12 c:/pfdata


13 pfdata default

13 pfdata/default


14 file open

14 File open


15 zip file

15 zip file

Double click to open


16 extract

16 extract


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


2 start pathfinder

2 Start Pathfinder


3 default

3 Default


19 pathfinder

19 Pathfinder

Add your GPS data


19 opened file

19 Opened file


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


21 diff correction

21 diff correction


Beginning

wait

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


22 local search

22 Local search


22 local search in base

22 Local search in base


23 matching files

23 matching files


24 base data ok

24 base data ok


25 smart code ok

25 smart code ok

Use Smart Code and Carrier Phase Processing


26 diff cor done

26 diff cor done


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…)


Beginning

fini

fini


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