shrug-l: .dgn files
Eric_Songer at URSCorp.com
Eric_Songer at URSCorp.com
Thu Jan 26 13:42:33 EST 2006
Okay,
Anybody who knows me just knew I had to comment on this one.
First, make sure the *&^*^&@$ Microstation file is rally in State Plane
Coordinates (SPC), and not some surveyor or CAD guy scaling a local
coordinate system to feet and pretending it is in SPC. Or worse yet, a CAD
guy moving or rotating the drawing to fit the page space or page size.
This happens all the time with FDOT as-builts and design files, which
around here is usually where Microstation is used.
Second, the FIPSZone number and the Zone number are merely different names
for the same thing. One's the Federal Information Processing System (FIPS)
code, and I don't know where the other one comes from. The same thing
happens with every thing from counties to quad sheets (e.g. there's a FIPS
code for every county). There are 3 SPC zones in Florida, and they always
have the same coordinates in a given datum. There is an offset (10,000
foot, I believe) between the datums NAD27 and NAD83 for all SPC's so that
the datums would not get mixed up when overlaid.
Third, it's my understanding, that datum shifts are always an estimation,
of which, the mathematics escape me entirely. The various options
available in ArcToolbox apply differing estimation methods, which all have
their pros and cons. Maybe somebody else can enlighten us on which one is
best for Florida? I generally use CORPSCON, because I know where it came
from.
Eric Songer
URS Corporation
1625 Summit Lake Drive
Tallahassee, FL 32317
Direct: 850.402.6327
Main: 800.842.9671 ext. 327
eric_songer at urscorp.com
This e-mail and any attachments are confidential. If you receive this
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"Dietrich, Mark"
<Mark.Dietrich at de
p.state.fl.us> To
Sent by: "Tan, Yurong" <Yurong.Tan at va.gov>,
shrug-l-bounces at l "Thomas, Jim"
ists.dep.state.fl <jim_thomas at golder.com>,
.us <tdarsey at hsa.cc>, "Shrug (E-mail)"
<shrug-l at lists.dep.state.fl.us>
cc
01/26/2006 12:36
PM Subject
RE: shrug-l: .dgn files
I've also noticed that if a transformation is required such as between
NAD27 and NAD83 that ArcMap doesn't handle it on the fly. The datum shift
with state plane is much larger than with UTM or other projections so that
could be another source of a large displacement.
From: shrug-l-bounces at lists.dep.state.fl.us
[mailto:shrug-l-bounces at lists.dep.state.fl.us] On Behalf Of Tan,
Yurong
Sent: Thursday, January 26, 2006 12:28 PM
To: Thomas, Jim; Dietrich, Mark; tdarsey at hsa.cc; Shrug (E-mail)
Subject: RE: shrug-l: .dgn files
You can google it. Cheers
◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘
Yurong Tan, Ph.D., Program Analyst/GIS
Email: Yurong.tan at med.va.gov
PSSG, field unit for the Office of the ADUSH (Policy & Planning)
Phone: 352-374-6080 (x5382)
Department of Veterans Affairs
Fax: 352-374-6119
300 E. University Avenue, Suite 430
Web: www.med.va.gov
Gainesville, Florida 32601 USA
________________________________________________________________
They all gave some and some gave all!
From: Thomas, Jim [mailto:jim_thomas at golder.com]
Sent: Thursday, January 26, 2006 12:15 PM
To: Tan, Yurong; Dietrich, Mark; tdarsey at hsa.cc; Shrug (E-mail)
Subject: RE: shrug-l: .dgn files
That's interesting. One is a FIPSZONE (0901) and the other an
ADSZONE (3601). Does anyone know the difference? ArcGIS lists only
the FIPSZONE from what I can tell.
From: shrug-l-bounces at lists.dep.state.fl.us
[mailto:shrug-l-bounces at lists.dep.state.fl.us] On Behalf Of Tan,
Yurong
Sent: Thursday, January 26, 2006 12:04 PM
To: Dietrich, Mark; tdarsey at hsa.cc; Shrug (E-mail)
Subject: RE: shrug-l: .dgn files
Also, you might need to check into the specified “ZONE” in the
(Florida) State Plane coordinate system. For instance, if I can
recall correctly that Florida StatePlane East can have zone 901 or
zone 3601 and the coordinates of the two zoning systems are
completely different.
Good luck!
◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘◘
Yurong Tan, Ph.D., Program Analyst/GIS
Email: Yurong.tan at med.va.gov
PSSG, field unit for the Office of the ADUSH (Policy & Planning)
Phone: 352-374-6080 (x5382)
Department of Veterans Affairs
Fax: 352-374-6119
300 E. University Avenue, Suite 430
Web: www.med.va.gov
Gainesville, Florida 32601 USA
________________________________________________________________
They all gave some and some gave all!
From: shrug-l-bounces at lists.dep.state.fl.us
[mailto:shrug-l-bounces at lists.dep.state.fl.us] On Behalf Of Dietrich,
Mark
Sent: Thursday, January 26, 2006 11:30 AM
To: tdarsey at hsa.cc; Shrug (E-mail)
Subject: RE: shrug-l: .dgn files
If you are trying to view it in a projection other than the state
plane try to first create a .prj file with the correct projection
information. You can use a template from another shape file and
simply change the prefix to the same file name as the .dgn file.
If you have already brought it into ArcMap it may have created a .xml
file which can contain incorrect information. You will have to delete
that file first to make it work. Don't add it to ArcMap until you
have the renamed .prj file in the same directory as the CAD file.
Otherwise change your data view's projection to the state plane 83
north and everything should align with the CAD file.
Mark Dietrich
NHD Coordinator
GIS Subsection
Bureau of Watershed Management
From: shrug-l-bounces at lists.dep.state.fl.us
[mailto:shrug-l-bounces at lists.dep.state.fl.us] On Behalf Of
Tony Darsey
Sent: Thursday, January 26, 2006 11:09 AM
To: Shrug (E-mail)
Subject: shrug-l: .dgn files
Can anyone tell me why I am having this problem. I am trying to
add a Microstation .dgn file that is in state plane 83 north
and when I bring it into ArcMap it is WAY OFF. Any suggestions?
(Embedded image moved to file: pic25012.jpg)
Tony Darsey
HSA Consulting Group, Inc.
1311 Executive Center Drive, Suite 255
Tallahassee, FL 32301
Phone (850) 309-7510
Fax (850) 309-7510
email tdarsey at hsa.cc
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