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| GeoCommunity Mailing List |
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| Subject: | RE: [gislist] RE: nation wide Tax Map/Parcel Map Digital Data... |
| Date: |
01/12/2004 09:35:01 PM |
| From: |
Julia Harrell |
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Dear Listers,
Regarding some of these comments on the parcel data dilemma:
>> The data is so scattered that even if it were all readily available,
>> it would be a Herculean task to collect it together and put it in a=20
>> common format.
>> I'm thinking that what we need is a warehouse for all this data...
>> After some research I was able to find=20
>> http://www.boundarysolutions.com/
=20
One way to avoid the centralized warehouse and the common format issue =
is to
utilize OGC WMS or WFS feature services. Here in NC, we are starting to =
work
with these OGC protocols in the NC OneMap demonstration site. We have a
number of counties and cities, as well as State and Federal participants =
all
serving data to the same map viewer application (housed at USGS EROS =
Data
Center). Not all of this data is in the same map projection, nor does it =
all
have to be in the same format. If the individual Mapservers support the
WMS/WFS protocols, then the output is essentially the same - an image =
map,
or features. To be sure, there are still plenty of issues with the way
different mapserver applications implement the spec(s), but the =
potential is
there and continues to improve.=20
Another advantage over the centrally located warehouse (presumably run =
by a
data reseller) is that the entities that maintain the data are the ones
providing the OGC web services. Some counties participating in our pilot
project update the parcel data in their web service each night, so =
currency
could cease to be a big problem. Others update weekly or monthly, which =
is
still much better than the four times a year you could get from the
above-mentioned data reseller. At some point, the NC OneMap services =
will
feed up into the National Map and Geospatial OneStop. As Ted Cisine =
pointed
out, there will always be some holes where digital parcels do not exist =
in
rural/poor counties, but hopefully a number of these will disappear over
time. And as with all things, we're likely to have some hold-outs who do
have digital data and don't want to share. Right now we're just hoping =
to
surround them, and then eventually 'convince' them into filling in the =
holes
in the map :)
Although this is only one potential way to deal with the issue, we =
encourage
other State GIS Coordination Agencies to try similar projects in their
jurisdictions. State level partnerships with City and County governments =
is
the about only way this will truly become possible, because in a lot of
states, cadastral data is maintained at the more local levels of =
government.
There are some similar initiatives out there - BLM is sponsoring some =
OGC
pilot projects.
The Cadastral attribute content standards are also in-work, and some say
they might always be :)
Check out http://www.fairview-industries.com/fgdc-cad.html
And there is a map viewer here displaying what is currently know about
online parcel coverage:
http://www.landuse.com/website/cadastral/viewer.htm
Check out http://www.nconemap.com/ and=20
http://www.opengis.org/press/?page=3Dogcuser&view=3D20031223_ogcuser for =
some
background on NC OneMap.=20
Sincerely,
Julia Harrell
NC CGIA
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