shrug-l: Trimble ProXRS VS Trimble GeoExplorer XT
Jim Robeson
jim@gpserv.com
Wed, 19 Oct 2005 10:39:36 -0400
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MessageHolli,
Using WAAS is has it's problems. The WAAS satellite is geo stationary and
is located in the southeast sky at about 45 - 44 degrees for you in VA, 45 -
46 in FL. WAAS is what I consider non-mission-critical-DGPS. When you do
get it, with either an XRS or a Geo XT, you can reasonably expect a one
meter or better position. You should use the USCG Beacon for Real Time
correction in the Virginia Beach area. You have considerable redundancy of
Beacon coverage in your area. With the closest Beacon located in Driver,
your accuracy should be a very reliable 1 - 2 feet while using an XRS with
good satellite coverage. The Beacon, like all real-time correction sources
has it's weakness. Very noisy power lines, typically high tension lines
that are not well maintained, can be a problem. Also, power sub-stations
and large motors can also be a problem. This interference is very much
localized and it limited to only interfering with the USCG Beacon AM radio
broadcast. Data can always be collected and post processed. It is an easy
procedure that typically takes only a few minuets for a days work.
As for productivity, the XRS is typically a more productive product. The
XRS is more accurate and tracks in canopy far better then the XT. If the
XRS is used with a data logger like the TSCe or the new Ranger it is even
more effective for attribute entry with a full keyboard. If I were to
conduct daily mapping, I would go with the XRS with Ranger. The down side
is the fact that it is a backpack and is fairly large. The fact that is a
backpack it one of the reasons that it is more producing; the antennas is
located in the clear above you.
The Geo XT is a good unit and is widely used in many places for the
collection and maintenance of data. It has a very large selling point, it
is small and portable. Both the tracking and accuracy can be improved with
the use of a Hurricane Antenna. Trimble has a good white paper on the
antennas and accuracy, search on Hurricane.
Renting is a good idea. The availability of Trimble rental equipment is
fairly tight due to Hurricane relief. The Trimble dealer that handles you
area is York Grow, Earth Vector Systems, LOC, 434-817-5000.
I hope this helps,
Feel free to contact me on the side with any question that you might have.
Regards,
Jim Robeson
James M.Robeson
< <<mailto:Jim@GPServ.com>>>
Tallahassee Office
Phone (850) 656-6075
FAX (850) 656-1350
Corporate Office
Phone (888) 782-1997
Phone (407) 772-2046
FAX (407) 772-2047
Corporate Address
GPServ, Inc.
766 Big Tree Drive
Suite 104
Longwood, Fl 32750
Web Site: GPServ.com
-----Original Message-----
From: shrug-l-admin@lists.dep.state.fl.us
[mailto:shrug-l-admin@lists.dep.state.fl.us]On Behalf Of Tripp Corbin
Sent: Wednesday, October 19, 2005 7:47 AM
To: Holli Brandt; shrug-l@lists.dep.state.fl.us
Subject: RE: shrug-l: Trimble ProXRS VS Trimble GeoExplorer XT
Holli,
Based on my experience, which has not been with Trimble units, in order to
get reliable sub-meter locations WAAS correction is not sufficient. I would
only guarantee plus or minus 2 to 3 meters using WAAS alone. In order to get
reliable sub-meter positions in the field without post processing, I use
either Coast Guard beacons or Omnistar corrections. Otherwise post
processing is required.
I hope this helps.
Tripp Corbin, MCP, GISP
Associate Vice President, GIS/Mapping
ESRI Authorized Instructor
Keck & Wood, Inc.
www.keckwood.com
(678) 417-4013
(678) 417-8785 fax
Keck & Wood, Inc now offers Introduction to ArcGIS/ArcView training
classes. Contact me for more information.
Currently Scheduled Classes:
Introduction to ArcGIS I - October 25-26 in Thomasville, GA (Class is
sponsored by the Southwest GA RDC GIS Dept.)
Introduction to ArcGIS II - November 7, 9, & 10 at the SHRUG Workshop in
Tallahassee, FL
-----Original Message-----
From: shrug-l-admin@lists.dep.state.fl.us
[mailto:shrug-l-admin@lists.dep.state.fl.us] On Behalf Of Holli Brandt
Sent: Tuesday, October 18, 2005 7:50 AM
To: shrug-l@lists.dep.state.fl.us
Subject: shrug-l: Trimble ProXRS VS Trimble GeoExplorer XT
Good Morning Everyone -
Yes, I am still plugging the forum for information even though I have
moved. Still the best source for information and opinions.
We are going to be completing some field work in the near future and are
looking into renting a GPS Unit (trying it out before we buy). For
sub-meter accuracy, the following two units were recommended time and time
again, the Trimble ProXRS VS Trimble GeoExplorer XT. I am aware of the
basic differences between these two units, ProXRS has external antennae and
differential GPS and the GeoXT has internal antennae and WAAS. I know which
way I am leaning but would like to hear what any of you have to say before I
commit.
Any personal opinions or criticisms about these units? Which do you
suggest? Any other GPS unit you prefer?
Thanks - Holli
Holli M. Brandt
Project Manager
EnVetCo
500 S. Independence Blvd
Suite 200
Virginia Beach, VA 23452
(757) 518-8491
brandth@tesorocorp.com
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<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D312173213-19102005>Holli, </SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D312173213-19102005></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D312173213-19102005>Using=20
WAAS is has it's problems. The WAAS satellite is geo =
stationary=20
and is located in the southeast sky at about 45 - 44 degrees for you in =
VA, 45 -=20
46 in FL. WAAS is what I consider non-mission-critical-DGPS. =
When=20
you do get it, with either an XRS or a Geo XT, you can reasonably =
expect a=20
one meter or better position. You should use the =
USCG=20
Beacon for Real Time correction in the Virginia Beach area. You =
have=20
considerable redundancy of Beacon coverage in your area. With the =
closest=20
Beacon located in Driver, your accuracy should be a very reliable 1 - 2 =
feet=20
while using an XRS with good satellite coverage. The Beacon, like =
all=20
real-time correction sources has it's weakness. Very noisy power =
lines,=20
typically high tension lines that are not well maintained, can be a=20
problem. Also, power sub-stations and large motors can also be a=20
problem. This interference is very much localized and it limited =
to only=20
interfering with the USCG Beacon AM radio broadcast. Data can =
always be=20
collected and post processed. It is an easy procedure that =
typically takes=20
only a few minuets for a days work. </SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D312173213-19102005></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D312173213-19102005>As for=20
productivity, the XRS is typically a more productive product. The =
XRS is=20
more accurate and tracks in canopy far better then the XT. If the =
XRS is=20
used with a data logger like the TSCe or the new Ranger it is even more=20
effective for attribute entry with a full keyboard. If I were to =
conduct=20
daily mapping, I would go with the XRS with Ranger. The down side =
is the=20
fact that it is a backpack and is fairly large. The fact that is a =
backpack it one of the reasons that it is more producing; the =
antennas is=20
located in the clear above you. </SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D312173213-19102005></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D312173213-19102005>The=20
Geo XT is a good unit and is widely used in many places for the =
collection and=20
maintenance of data. It has a very large selling point, it is =
small and=20
portable. Both the tracking and accuracy can be improved with =
the use=20
of a Hurricane Antenna. Trimble has a good white paper on =
the=20
antennas and accuracy, search on =
Hurricane. </SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D312173213-19102005></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D312173213-19102005>Renting is a good idea. The =
availability of=20
Trimble rental equipment is fairly tight due to Hurricane relief. =
The=20
Trimble dealer that handles you area is York Grow, Earth Vector Systems, =
LOC, 434-817-5000. </SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D312173213-19102005></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D312173213-19102005>I hope=20
this helps,</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D312173213-19102005></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D312173213-19102005>Feel=20
free to contact me on the side with any question that you =
might=20
have. </SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D312173213-19102005></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D312173213-19102005>Regards,</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D312173213-19102005></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D312173213-19102005>Jim=20
Robeson</SPAN></FONT></DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D312173213-19102005></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D312173213-19102005></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN=20
class=3D312173213-19102005></SPAN></FONT> </DIV>
<DIV><FONT face=3DArial color=3D#0000ff size=3D2><SPAN =
class=3D312173213-19102005> =20
</SPAN></FONT></DIV>
<DIV> </DIV><BR>
<UL>
<P><B><I><FONT face=3D"Arial Black">James=20
M.Robeson </FONT></I></B><I> </I><BR><I><U><FONT=20
face=3D"Times New Roman" color=3D#0000ff>< <<<A=20
=
href=3D"mailto:Jim@GPServ.com">mailto:Jim@GPServ.com</A>>>></FON=
T></U></I>=20
<BR><I><B><FONT face=3DVerdana size=3D2>Tallahassee=20
=
Office <=
/FONT></B>=20
</I><BR><I><FONT face=3DVerdana size=3D2>Phone (850) =
656-6075</FONT></I>=20
<BR><I><FONT face=3DVerdana size=3D2>FAX (850) 656-1350</FONT></I> =
<BR><I><FONT=20
face=3DArial> </FONT></I> <BR><I><B><FONT face=3DVerdana =
size=3D2>Corporate=20
Office</FONT></B><FONT face=3DVerdana=20
=
size=3D2> &nbs=
p; </FONT>=20
</I><BR><I><FONT face=3DVerdana size=3D2>Phone (888) =
782-1997</FONT></I>=20
<BR><I><FONT face=3DVerdana size=3D2>Phone (407) 772-2046</FONT></I> =
<BR><I><FONT=20
face=3DVerdana size=3D2>FAX (407) 772-2047</FONT></I> <BR><I><FONT=20
face=3DArial> </FONT></I> <BR><I><B><FONT face=3DVerdana =
size=3D2>Corporate=20
Address </FONT></B>=20
</I><BR><I><FONT face=3D"Arial Black" size=3D2>GPServ, Inc.</FONT></I> =
<BR><I><FONT face=3DVerdana size=3D2>766 Big Tree Drive</FONT></I> =
<BR><I><FONT=20
face=3DVerdana size=3D2>Suite 104</FONT></I> <BR><I><FONT =
face=3DVerdana=20
size=3D2>Longwood, Fl 32750</FONT></I> <BR><I><FONT face=3DVerdana =
size=3D2>Web=20
Site: GPServ.com</FONT></I> </P></UL>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DTahoma=20
size=3D2>-----Original Message-----<BR><B>From:</B>=20
shrug-l-admin@lists.dep.state.fl.us=20
[mailto:shrug-l-admin@lists.dep.state.fl.us]<B>On Behalf Of </B>Tripp=20
Corbin<BR><B>Sent:</B> Wednesday, October 19, 2005 7:47 =
AM<BR><B>To:</B> Holli=20
Brandt; shrug-l@lists.dep.state.fl.us<BR><B>Subject:</B> RE: shrug-l: =
Trimble=20
ProXRS VS Trimble GeoExplorer XT<BR><BR></FONT></DIV>
<DIV><SPAN class=3D918044211-19102005><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>Holli,</FONT></SPAN></DIV>
<DIV><SPAN class=3D918044211-19102005><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>Based on my experience, which has not been with Trimble =
units, in order=20
to get reliable sub-meter locations WAAS correction is not =
sufficient. I=20
would only guarantee plus or minus 2 to 3 meters using WAAS alone. In =
order to=20
get reliable sub-meter positions in the field without post processing, =
I use=20
either Coast Guard beacons or Omnistar corrections. Otherwise post =
processing=20
is required. </FONT></SPAN></DIV>
<DIV><SPAN class=3D918044211-19102005></SPAN> </DIV>
<DIV><SPAN class=3D918044211-19102005><FONT face=3DArial =
color=3D#0000ff size=3D2>I=20
hope this helps.</FONT> </SPAN></DIV>
<DIV> </DIV>
<DIV> </DIV>
<P style=3D"MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px" align=3Dleft>Tripp =
Corbin, MCP,=20
GISP</P>
<P style=3D"MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px" =
align=3Dleft>Associate Vice=20
President, GIS/Mapping</P>
<P style=3D"MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px" align=3Dleft><I>ESRI =
Authorized=20
Instructor</I></P>
<P style=3D"MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px" align=3Dleft><B>Keck =
& Wood,=20
Inc.</B></P>
<P style=3D"MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px" align=3Dleft><A=20
href=3D"http://www.keckwood.com/"><FONT color=3D#0000ff><U><FONT=20
size=3D2>www.keckwood.com</FONT></U></FONT></A></P>
<P style=3D"MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px" align=3Dleft><FONT =
size=3D2>(678)=20
417-4013</FONT></P>
<P style=3D"MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px" align=3Dleft><FONT =
size=3D2>(678)=20
417-8785 fax</FONT></P>
<P style=3D"MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px" =
align=3Dleft> </P>
<P style=3D"MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px" align=3Dleft><B>Keck =
& Wood,=20
Inc</B> now offers Introduction to ArcGIS/ArcView training classes. =
Contact me=20
for more information. <BR>Currently Scheduled Classes: =
<BR>Introduction to=20
ArcGIS I - October 25-26 in Thomasville, GA (Class is sponsored by the =
<A=20
href=3D"http://www.swgrdc.org/planning.htm">Southwest GA RDC GIS =
Dept.</A>) </P>
<P style=3D"MARGIN-TOP: 0px; MARGIN-BOTTOM: 0px" =
align=3Dleft>Introduction to=20
ArcGIS II - November 7, 9, & 10 at the <A=20
href=3D"http://shrug-gis.info/workshop05">SHRUG Workshop</A> in =
Tallahassee, FL=20
</P>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr =
align=3Dleft><FONT=20
face=3DTahoma size=3D2>-----Original Message-----<BR><B>From:</B>=20
shrug-l-admin@lists.dep.state.fl.us=20
[mailto:shrug-l-admin@lists.dep.state.fl.us] <B>On Behalf Of =
</B>Holli=20
Brandt<BR><B>Sent:</B> Tuesday, October 18, 2005 7:50 =
AM<BR><B>To:</B>=20
shrug-l@lists.dep.state.fl.us<BR><B>Subject:</B> shrug-l: Trimble =
ProXRS VS=20
Trimble GeoExplorer XT<BR><BR></FONT></DIV>
<DIV dir=3Dltr align=3Dleft><SPAN class=3D399192320-17102005><FONT =
face=3DArial=20
size=3D2>Good <SPAN class=3D830014911-18102005><FONT =
color=3D#0000ff><FONT=20
color=3D#000000> Morning</FONT> </FONT></SPAN> Everyone=20
-</FONT></SPAN></DIV>
<DIV><SPAN class=3D399192320-17102005><FONT face=3DArial =
size=3D2>Yes, I am still=20
plugging the forum for information even though I have moved. =
Still the=20
best source for information and opinions.</FONT></SPAN></DIV>
<DIV><SPAN class=3D399192320-17102005><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D399192320-17102005><FONT face=3DArial size=3D2>We =
are going to=20
be completing some field work in the near future and are =
looking into=20
renting a GPS Unit (trying it out before we buy). =
For sub-meter=20
accuracy, the following two units were recommended time and time =
again, the=20
Trimble ProXRS VS Trimble GeoExplorer XT. I am aware of the =
basic=20
differences between these two units, ProXRS has external antennae =
and=20
differential GPS and the GeoXT has internal antennae and=20
WAAS. <SPAN class=3D399192320-17102005><FONT face=3DArial =
size=3D2>I=20
know which way I am leaning but would like to hear what any of you =
have to=20
say before I commit.</FONT></SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=3D399192320-17102005><FONT face=3DArial =
size=3D2><SPAN=20
class=3D399192320-17102005></SPAN></FONT></SPAN> </DIV>
<DIV><SPAN class=3D399192320-17102005><FONT face=3DArial =
size=3D2>Any personal=20
opinions or criticisms about these units? Which do you=20
suggest? Any other GPS unit =
you prefer?</FONT></SPAN></DIV>
<DIV><SPAN class=3D399192320-17102005><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D399192320-17102005><FONT face=3DArial=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D399192320-17102005><FONT face=3DArial =
size=3D2>Thanks -=20
Holli</FONT> </SPAN></DIV>
<DIV> </DIV>
<DIV align=3Dleft>
<DIV align=3Dleft><FONT face=3DPapyrus size=3D2></FONT> </DIV>
<DIV align=3Dleft><FONT face=3DPapyrus size=3D2>Holli M. =
Brandt</FONT></DIV>
<DIV align=3Dleft><FONT face=3DPapyrus size=3D2>Project =
Manager</FONT></DIV>
<DIV align=3Dleft><FONT face=3DPapyrus size=3D2>EnVetCo</FONT></DIV>
<DIV align=3Dleft><FONT face=3DPapyrus size=3D2>500 S. Independence=20
Blvd</FONT></DIV>
<DIV align=3Dleft><FONT face=3DPapyrus size=3D2>Suite =
200</FONT></DIV>
<DIV align=3Dleft><FONT face=3DPapyrus size=3D2>Virginia Beach, VA=20
23452</FONT></DIV>
<DIV align=3Dleft><FONT face=3DPapyrus>(757) 518-8491</FONT></DIV>
<DIV align=3Dleft><FONT face=3DPapyrus size=3D2><A=20
title=3Dmailto:brandth@tesorocorp.com=20
=
href=3D"blocked::mailto:brandth@tesorocorp.com">brandth@tesorocorp.com</A=
></FONT></DIV></DIV>
<DIV> </DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>
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