Go for long walks...
Is a "polygon" really different from a succession of waypoints in a route
(possibly closed by returning to the initial point)? In which case does GE
have to consider the sequence to be called a "polygon"?
Mike.
--
If reply address is invalid, remove spurious "@" and substitute "plus"
where needed.
hmm - what is the scenario ?
the only situation I can think of
is related to mapping an area,
and getting the "size"
That is correct. I am a biologist and I want to map vegetation
communities and upload them from my Garmin unit to GoogleEarth. The
tracking mode seems like it would work in the Garmin GPSMAP 60CSx,
however, the instructions say that it is contiguous for a 1 day
period. I want to be able walk around a vegetation community, close
the loop, save it as a named file then move over maybe a 100 meters
and map another vegetation community WITHOUT the ending waypoint and
beginning waypoint creating a line to connect.
I would be like the more expensive $3K - $5K GPS units which map
polygons and polylines, etc.
Sounds like the tracking feature might be just whet you are looking for.
I'll let the more knowledgeable in the group supply the details
--
Regards,
Richard Harison
> I want to be able walk around a vegetation community, close
> the loop, save it as a named file then move over maybe a 100 meters
> and map another vegetation community WITHOUT the ending waypoint and
> beginning waypoint creating a line to connect.
>
I ->think I know what you want to do, more or less, but only more or
less.
You could try uploading your tracks to MapSource and use the various
track manipulation tools (track draw, track point select, track join,
etc) to close your "loops" and remove connections between track loops.
It's been a while since I've actually looked at the tracks on my 76CSx
(essentially similar to your 60), but I recall that it starts a new
track whenever the receiver is turned off and back on again; perhaps
that's how you'd keep your loops from connecting to one another.
How you'd then export this data to Google Earth is another question
entirely.
MapSource itself computes the length and enclosed areas for track loops.
--
Bert Hyman St. Paul, MN be...@iphouse.com
Google Earth claims to be able to download tracks from Garmin GPS directly.
I've been drawing my Garmin tracks for years (see
http://www.mjcoon.plus.com/page38.htm) but need to use an intermediate PDA
because my Garmin's memory is inadequate, so I haven't used the Google Earth
feature. You are welcome to my PC/PDA programs (currently for Windows or for
a Pocket Loox which has serial connectivity like my Garmin).
I also have a 76CSx.
Alternately you could save the first polygon to the SD card then clear the
delete the current track after switching tracking to OFF.
Then turn tracking back on.
--
Regards,
Richard Harison
But then you'd have to wait for the GPS to lock on again etc. Probably
easier just to split the track in MapSource afterwards, and delete the
bits you don't need. You could mark waypoints at the start / end of each
section, so you know where to split.
> How you'd then export this data to Google Earth is another question
> entirely.
MapSource has a "View in Google Earth" option (on the View menu), which
will transfer all of the tracks / routes / waypoints you are currently
using.
Alternatively, you could save as GPX format, then open that in Google Earth.
Or if you want to do this sort of thing properly, you should be looking
at GIS software. There are a few free options, eg Quantum GIS
http://qgis.org/
Though probably rather more complicated.
--
Craig Wallace
http://craig.neogeo.org.uk
http://www.neogeo.org.uk
ok - so what about this scenario:
Clear your track log.
enable tracking and walk the first polygon.
Disable tracking at end of polygon
walk to start of second polygon
begin tracking.
Disable tracking at end of polygon
etc...
take to mapsource at then of day and you should have the data
that you need if I'm following you correctly.
--
Steve
Why not just mark current position each time you are at a corner point
or turning point in your tracks, and do what the surveyors do - keep a
notepad/book where you write point numbers and what they stand for?
You probably do this anyway with your vegetation notations. Then load
these points into GE and do whatever you want from there.
Sorry for adding this to the wrong post but the original in not on my
server. Any track on a Garmin GPS can be seen in Google Earth.
Load the track into Mapsource, open the left margin slide panel, right
click on the track and left click "show selected track on map".
Close the slide panel, go to the view menu and click on "View in
Google Earth". Any tracks that are loaded into Mapsource will be in
the Google Earth program when it opens. The selected track will be
centered.
To make separate tracks just turn the track function on and off as you
need it. It will make a track when it is on and all tracks will have
a different number. You can rename the tracks in Mapsource.
There are some other features in Google Earth that I have found useful
for viewing tracks. If you need more information email me off the
News Group.
Larry