Seaclear - stitching tracks together

[MM5AHO]

I'd like to stitch together several days of seaclear tracks in order to show a whole journey. Currently they are individual tracks of each day.
Is there a way to edit these?

I also have a couple of tracks where the GPS picked up a wrong fix, some tens of miles out. I'd like to edit these to the average position of the fixes either side of the wrong one. Is there a way to do that?

(the speed I apparently did to get to the wrong fix point and back is amazing!)

 

[Bru]

Export them to csv format and then edit in a spreadsheet. Pita but the only way I know of doing it

 

[MM5AHO]

thanks

 

[AntarcticPilot]

If you get the tracks into a spreadsheet, there is a technique for removing isolated error points, called a median filter (http://en.wikipedia.org/wiki/Median_filter, which includes a worked example). At a particular point, you take the previous and next points, and sort them by the latitude (or longitude). Then simply return the middle point after sorting. That will remove "spikes".

Alternatively, you can readily identify error points and delete them by computing the distance from the last point - error points will show up as having too large a distance; if you convert it into a velocity, you'll certainly pick them out!

 

[Fantasie 19]

Export them to csv format and then edit in a spreadsheet. Pita but the only way I know of doing it

Disagree (he said hesitantly) - export them as GPX files and then load them all into, and edit them. in something like GPS Track Editor (http://www.gpstrackeditor.com/)

 

[Bru]

Disagree (he said hesitantly) - export them as GPX files and then load them all into, and edit them. in something like GPS Track Editor (http://www.gpstrackeditor.com/)

Well if you want to be flashy about it!

(exits stage left in a huff)

But seriously, yes that is a more elegant solution, I just like doing things the hard way

 

[AntarcticPilot]

Well if you want to be flashy about it!

(exits stage left in a huff)

But seriously, yes that is a more elegant solution, I just like doing things the hard way

If there are a lot of bad points, a spread-sheet (or other analytical software) offers more opportunities for automatically filtering them.

 

[Fantasie 19]

Well if you want to be flashy about it!

(exits stage left in a huff)

But seriously, yes that is a more elegant solution, I just like doing things the hard way

Phewwwww.... I thought I might be being a prat!

 

[Bru]

Phewwwww.... I thought I might be being a prat!

Probably but not specifically