I've found that MaineDOT and E911 are the sources that most accurately
reflect reality in a vast majority of cases.   There is no better source
for road names and address ranges than E911 roads.  MaineDOT's strength
is the linework representation and associated attributes such as federal
functional classification, jurisdiction, routes, and more.  While far
from perfect at the scales commonly used today, it does contain some the
most accurate centerline representations known.   MaineDOT also tries to
have the road name attribute reflect the name shown in E911.

 

Representatives of MaineDOT and E911 have convened many times in the
past to develop common understandings of each other's processes, tools
and needs in attempts to formulate plans for a centerline merger.  While
not completely dead, these efforts have not resulted in substantial
changes in the data (due to differences in technological tools, the
initial expense of time in establishing the "merged" basemap and the
lack of any mandate to do so).

 

It is worth noting that both centerline efforts started out as efforts
to build and maintain basemaps at 1:24,000 back in the early to mid
90's.  Both datasets now far exceed this level of detail.  However, with
the advent of aerial photos, this data is often used at scales of 1:1000
or finer.  With the same or less staff to handle this much larger task,
it may be some time before the linework hese datasets can consistently
match photos at these scales.

 

I've been in correspondence with NAVTEQ and given them a copy of
MaineDOT centerlines.  They stated that they would evaluate the data to
see if they could use it, but even if the evaluation is favorable, they
are actively maintaining their own graphical and logical representation,
which makes it difficult to incorporate large amounts of changes (as is
the case with E911 and MaineDOT).   For them, the motivation to expend
large amounts of time and energy is even less, since Maine is a
relatively less-populated state and a majority of their end-users are
tickled if they get within a tenth of a mile of their desired location
(think Mapquest, Yahoo maps, navigation GPS and Google Maps).  

 

___________________________________________

 

Nathan Kane, GIS Coordinator

Maine Department of Transportation

16 State House Station, Augusta ME 04333-0016

(207) 624-3297,   Fax-(207) 624-3301

[log in to unmask] <mailto:[log in to unmask]> 

 

________________________________

From: Maine GeoLibrary [mailto:[log in to unmask]] On Behalf
Of Davis, Greg
Sent: Wednesday, September 17, 2008 5:30 PM
To: [log in to unmask]
Subject: Re: Planning Project Update

 

Good List, however I would like to mention that from my preliminary
review of the E911 centerlines and MEDOT centerlines in comparison to
centerline of 2 most widely used sources (NAVTEQ and TELEATLAS) for
street data in comparison or overlaid to Google Earth.  I have found
that there is a lot of mismatch between Google and our local (E911 &
MEDOT) sources.

 

Has anyone else seen this?  What source is considered to be correct or
mostly correct?

 

All your input would be appreciated as I'm under a task of developing a
new state landbase and then there is addressing, not address ranges.
That is another question that can wait, but address ranges without
knowing what that towns standard (50, 100', or 200') becomes very
difficult to determine.  Then you have towns that have their parcel data
with addressing posted to their websites, but we don't have access to
that data from the state website.

 

All input and suggests are welcome.

 

Thanks,

 

Greg Davis

Time Warner Cable

[log in to unmask]

 

 


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________________________________

From: Maine GeoLibrary [mailto:[log in to unmask]] On Behalf
Of Will Mitchell
Sent: Wednesday, September 17, 2008 5:02 PM
To: [log in to unmask]
Subject: Planning Project Update

 

In a continuing effort to keep the Maine GeoSpatial community aware of
the actions taking place on the GeoLibrary Board's strategic planning
efforts, the Sewall Team has summarized input received from the Maine
Geospatial community, the 2002 Strategic Plan and the GeoLibrary Board
and provided the following chart entitled, "Overall Maine GeoSpatial
Listing of Issues and Action Items."  The chart attempts to summarize
the action items and issues needing resolution.  Each issue or action
item has a "potential solution" indicated for it, a time frame for
implementation and a priority.

 

We would appreciate it if you could take a look at this summary and
provide us with input on them by sending an e-mail to:
[log in to unmask] with the subject heading noted as "Maine
Stakeholder Input."

 

Once again, we thank you for your time and effort.

 

On behalf of Bill Hanson, GeoLibrary board chair...

 

Will Mitchell 
Mitchell Geographics, Inc.
188 State Street, Suite 200
Portland, ME 04101 
Office:  207.879.7769
Mobile: 207.650.2057
Fax:  207.221.5861
www.mitchellgeo.com

 

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