shrug-l: RE: Lat/Long Tool

[Jim Robeson]

GPS, clearly is not.  In the moving of data back and forth from system to
system you do get rounding.  Over the years positional dada can move.  13
decimal places is a case of just because you can, should you? 

 

Regards,

Jim Robeson

 

James M. Robeson

Mapping/GIS Sales, Trimble Certified Trainer    

 <mailto:Jim at gpserv.com> Jim at gpserv.com

Direct (850) 656-6075

 

 

 <mailto:Jim at gpserv.com> 

 

 

Products:  Trimble Mapping, Trimble Survey, ESRI, Leica HDS Laser Scanners,
LTI, Ricoh, Laser Craft,

 

Survey or Mapping Products, Get it Repaired in Orlando! 

 

 

From: shrug-l-bounces at lists.dep.state.fl.us
[mailto:shrug-l-bounces at lists.dep.state.fl.us] On Behalf Of Peterson, Lance
Sent: Wednesday, June 11, 2014 10:40 AM
To: shrug-l at lists.dep.state.fl.us
Subject: shrug-l: RE: Lat/Long Tool

 

I find it hard to believe that GPS measurements can be accurate to 13
decimal places. For decimal degrees that would be .00001mm. 

 

Using a greater number of significant digits in a calculation than a device
is capable of measuring will just lead to false precision.

 

Lance Peterson

ISS Systems Developer

City of Tallahassee

850-891-2019

 

From: shrug-l-bounces at lists.dep.state.fl.us
<mailto:shrug-l-bounces at lists.dep.state.fl.us>
[mailto:shrug-l-bounces at lists.dep.state.fl.us] On Behalf Of Sykes, John
Sent: Wednesday, June 11, 2014 9:48 AM
To: shrug-l at lists.dep.state.fl.us <mailto:shrug-l at lists.dep.state.fl.us> 
Subject: shrug-l: Lat/Long Tool

 

Before ArcGIS 10.2, I had a dynamite tool from the USDA National Forest
Service out of Santa Fe, NM, that could be added to a toolbar and would
allow you to click on a point and it would give you a pop-up with the
latitude & longitude to about 6 or more decimal places in the seconds field
(e.g., 26° 15’ 20.546947”) and decimal degrees to about 13 decimal places.
Of course, it no longer works with 10.2.

 

Now before you say no one needs that kind of accuracy I say, wrong!  Just
look at any CORS station, which is listed in DMS to 5 decimal places as is
all USGS marker data.  This tool had those locations nailed to all five
decimal places!

 

The DEP tool is less useful that the ArcGIS readout both of which are 2
decimal places in DMS format (the ArcGIS readout can give higher accuracy if
used in the degrees, decimal minutes format – go figure).

 

GIS and GPS are getting way more accurate, we need GIS tools that have the
same level of accuracy.

 

But enough of the preaching, the original question is, does anyone have or
know of a lat/long tool with about 6 decimal accuracy in DMS mode that works
with 10.2?

 

-- John 

 

 

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.dep.state.fl.us/pipermail/shrug-l/attachments/20140612/408f2c1b/attachment.html
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 28900 bytes
Desc: not available
Url : http://lists.dep.state.fl.us/pipermail/shrug-l/attachments/20140612/408f2c1b/attachment.jpeg