Richard Polivka, N6NKO wrote:
Gerry,
Yes, the coffee has kicked in and I had egg-on-face for breakfast. The
map in QGIS looks just like the same as the aforementioned area when at
full extent view. Zoomed in, it works.
The egg comment has to do with a Census screwup... It's Census, it's
gonna happen. Their view of GIS has been "interesting" for some time.
I am glad you got it to work!
Error budget - Well, I am within 5 ft on backtracked trails. Can't
complain for working under a tree canopy.
1.8m isn't bad, at all! Now: Imagine what happens when your typical
error is 2-3 meters, and a picnic table is smaller in at least one
dimension is smaller than the error budget. The geometry is, well,
interesting, and usually looks more like a bow-tie than a rectangle.
Getting several points to define the radius of a trash can gets even
more entertaining.
I had the GPS unit on top of a 7 ft PVC pipe talking to my smartphone
over bluetooth. I just ran out of time to cover the whole place but the
proof of concept pans out.
When I go do this stuff, I use a 2m "range" pole. a fixed height
fiberglas and metal deal designed to poke holes in shoes and give one a
good feel that their antenna is exactly this high above the point in
question. We also have a bulls-eye level on it to allow us to get it
spot-on above the point in question.
Your rig sounds easier to work with.
gerry
Now its off to other work tasks.
73 from 807,
Richard, N6NKO
Gerry Creager wrote:
Richard Polivka, N6NKO wrote:
Gerry,
Good morning!
I realize that wholeheartedly, but to have this big of a
screwup....oh, wait, this is the Federal Government....
Aha! Your coffee kicked in? What hardware are you using for your
campground survey? I can tell you stories about those from several
years ago, when folks were trying to resolve objects (e.g., a picnic
table) that was smaller than their uncorrected L1 error budget...
gerry
Gerry Creager wrote:
Richard Polivka, N6NKO wrote:
I admit that one point does not make a trend but what I found was
eyeopening.
I wanted just Fond du Lac county in Wisconsin to use as a base map
for mapping project that I am working on ( a Boy Scout campground).
I pulled in my files into QGIS and then brought in
"fe_2007_55039_edges". I did not get Fond du Lac County but a huge
overview of north Illinois, Indiana and SE Michigan. OUCH!!!
I even went and downloaded a virgin fileset and got the same
results (see picture).
55039.png
This is not good. I plan on sending on a comment to the Census Bureau.
So, let the user beware - YMMV.
Unfortunately, this warning has always been necessary with TIGER
files. They're not the best GIS data source. They're just
available and free.
_______________________________________________
Xastir mailing list
Xastir@xastir.org
http://lists.xastir.org/cgi-bin/mailman/listinfo/xastir
_______________________________________________
Xastir mailing list
Xastir@xastir.org
http://lists.xastir.org/cgi-bin/mailman/listinfo/xastir
--
Gerry Creager -- [EMAIL PROTECTED]
Texas Mesonet -- AATLT, Texas A&M University
Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.862.3983
Office: 1700 Research Parkway Ste 160, TAMU, College Station, TX 77843
_______________________________________________
Xastir mailing list
Xastir@xastir.org
http://lists.xastir.org/cgi-bin/mailman/listinfo/xastir
