Has anyone conducted and posted the results of a mobile mapper ce test in the trees and in the open? Before I am willing to spend $ I want to see the results from a site that has a bit of challenge to it. Can someone set up a grid in the dense woods that is measured with a tape or surveyed so we know the real distances? I would like to see this device challenged. It's fine to see it when it works but I want to know when it doesn't work.

Thanks,

Oh boy, just when you think the "foliage issue" has taken a nap, here we go again! If you click on the "Search" feature above and enter "Mississippi" as the search word you'll find the top of the thread "Mobile Mapping 'bout Mississippi" that is dated 8/16/05 @ 9:34 am. You might like to look that over. It is NOT the Mobile Mapper CE, but rather the Mobile Mapper Pro.

As far as I'm concerned, all official bets are off when you are in the woods. I can't and won't tell you it works great in the woods. That's something you'll have to decide for yourself.

Another thread you will find by searching for "mapperific"...don't ask, its a Deral thing...that is dated 8/07/05 @ 3:49pm. It's called "Mapperific Saturday", it was really the first time I'd tried out the Mobile Mapper Pro here at my residence, which does have all kinds of nasty multipath accessories.

Dangerous Dave
Modified By Dave Huff on 12/20/2005 at 5:41 PM

Now, John, play nice, it's too close to Christmas to pout. Santy claws won't come to see you.

I'm also interested in the MM CE Postprocessing abilities. If I add this feature, I'll have as much in my MM CE as a Promark III costs, and I won't even have the $700 external antenna. There is a white paper on results with the MM CE under canopy, but the observations were made with a beacon receiver. Maybe someone who has sprung for the postprocessing option will give us the scoop.
terry
Modified By J. T. Strickland on 12/20/2005 at 7:38 PM

John Francis telling someone to read the manual is really funny.

I'm glad he finally learned something here instead of just running his mouth.

Thanks for the laugh.

Now that I took my shot at JF, I will do something that he doesn't know how to do. I will add something meaningful to the OP.

I don't have a Mobile Mapper, but I have tried what you are asking with my L1/L2 RTK equipment.

There are times when I run initial centerline staking with a total station and set a lot of traverse nails under "dense foliage". The traverses are balanced with the compass rule and usually have an error of closure greater than 1 in 15,000.

I will then use my RTK gear to locate wetlands and sometimes I will pass near my road centerline points. Whenever I check the total station traverse points in "dense foliage" with the RTK equipment, I usually find that I am within about 3 to 6 feet of the location derived with the total station.(sometimes I am a lot closer)

This happens if I am able to obtain a float solution. Sometimes there are not enough satellites to get anything because of obstructions (dense foliage).

I understand this has nothing to do with a Mobile Mapper, but if I can get that close with RTK, I would not be surprised if post-processing a Mobile Mapper would function just as good, if not a lot better.

I ran a 4 hour static session under similar conditions with my PM2's last year and was within 0.8ft of a point determined by total station traversing that was located under "dense foliage".


John


Modified By Topcon John on 12/20/2005 at 8:53 PM

The MobileMapper CE I purchased is a good tool. It is my intention to add the post processing capability to it but the time and money budget are both a little thin right now.

I have not used it under "dense foliage" but I have used it in my neighborhood where a combination of buildings and trees makes accurate GPS measurement complicated.

I have even written a report about mapping my neighborhood and will be glad to share that report or the files from my sidewalk mapping projects with those who want to take a look.