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Pete,<br>
I was going to ask questions about this the first time you mentioned
it, but got distracted. I guess the main question I have is: what you
would "do" with it? I guess it could be considered an identifier for a
spot on the earth, but based on what I've read about guids it's
considered to be a "no-no" to try to infer stuff about a resource by
looking at the form of the identifier. Rather one should look at the
metadata associated with the identifier to understand things about the
identifier (which you provide with geo:lat and geo:long). I suppose
that one could consider this to be some kind of identifier that could
be reused, but particularly since the precision of your lat and long
are 8 digits, it is highly unlikely that anybody besides you is ever
going to choose to use this identifier over (vs. 44.86,-87.23 which
would be imprecise enough to include a lot of places to which people
might want to refer). I may just be misunderstanding the purpose you
intend.<br>
<br>
The other question is a more general one. Do we need more ways to
specify uncertainty in location than we already have? We already have
dwc:coordinateUncertaintyInMeters and dwc:coordinatePrecision . I've
been using dwc:coordinateUncertaintyInMeters with a seat-of-the pants
estimate on my part about how accurate I think my geolocation is
(expressed in meters). That may be a misuse of this term because I'm
really thinking radius around a point rather than uncertainty of
coordinates. But as a practical matter, if I think my estimate of
location is good to 1000 m (vs. 100 m or 10000 m) does it really matter
if I'm talking about a square or a circle? In any case, I'm saying,
this lat/long could be off from the actual location by a km. If I had
a GPS receiver that allowed me to download the actual estimated
accuracy (based on satellite signals and whatever else), then I would
populate dwc:coordinateUncertaintyInMeters with that, but mine crummy
old one doesn't. To me the most important thing is for users to know
whether this is a ballpark estimate or if they could expect to actually
be able to walk up to the tree using the coordinates they give.<br>
<br>
Steve<br>
<br>
Peter DeVries wrote:
<blockquote
cite="mid:AANLkTi=Rb2oDtrFt83pdeY7L2UsSKEE4vtD1N9+zfSdF@mail.gmail.com"
type="cite">I wrote about this earlier but I never heard anything back.
<div><br>
</div>
<div>I have made something that uses the geo vocabulary but also
allows pointRadiusSpatial fit measure that I call radius.</div>
<div><br>
</div>
<div>The advantage is that this adds a standard way to deal use
something like an extent or pointRadiusSpatial while still benefiting
from the widely used geo vocabulary.</div>
<div><br>
</div>
<div>It also allows these "Areas" to be referenced in a commonly
understood urn way that using a ietf standard.</div>
<div><br>
</div>
<div>For example: "<span
style="font-family: tahoma,sans-serif; font-size: 13px; border-collapse: collapse;">geo:44.86528100,-87.23147800;u=10"</span></div>
<div><br>
</div>
<div>There are still some things I need to fix and check with this
vocabulary but I am wondering if there is any interest in incorporating
this into the DarwinCore.</div>
<div><br>
</div>
<div>If not I will probably change the name of the ontology.</div>
<div><br>
</div>
<div>There are also things in the example below that are not part of
my proposal.</div>
<div><span
style="font-family: arial,sans-serif; font-size: 13px; border-collapse: collapse;">
<div><br>
I have what I call "Areas" that look like this:</div>
<div><br>
</div>
<div>
<div><font face="tahoma, sans-serif"> <dwc_area:Area
rdf:about="geo:44.86528100,-87.23147800;u=10"></font></div>
<div><font face="tahoma, sans-serif">
<dcterms:title>44.86528100, -87.23147800 Radius 10
meters</dcterms:title></font></div>
<div><font face="tahoma, sans-serif"> <dcterms:isPartOf
rdf:resource="<a moz-do-not-send="true"
href="http://lod.taxonconcept.org/ontology/void#this"
style="color: rgb(51, 51, 204);" target="_blank">http://lod.taxonconcept.org/ontology/void#this</a>"/></font></div>
<div><font face="tahoma, sans-serif">
<dcterms:identifier>geo:44.86528100,-87.23147800;u=10</dcterms:identifier></font></div>
<div><font face="tahoma, sans-serif">
<dcterms:created>2010-10-28T00:00:00-0500</dcterms:created></font></div>
<div><font face="tahoma, sans-serif">
<dcterms:modified>2010-11-09T16:33:34-0600</dcterms:modified></font></div>
<div><font face="tahoma, sans-serif">
<geo:lat>44.86528100</geo:lat></font></div>
<div><font face="tahoma, sans-serif">
<geo:long>-87.23147800</geo:long></font></div>
<div><font face="tahoma, sans-serif">
<dwc_area:radius>10</dwc_area:radius></font></div>
<div><font face="tahoma, sans-serif">
<txn:elevation>186.54</txn:elevation></font></div>
<div><font face="tahoma, sans-serif"> <txn:continent>North
America</txn:continent></font></div>
<div><font face="tahoma, sans-serif">
<txn:countryCode>US</txn:countryCode></font></div>
<div><font face="tahoma, sans-serif"> <txn:country>United
States</txn:country></font></div>
<div><font face="tahoma, sans-serif">
<txn:stateProvince>Wisconsin</txn:stateProvince></font></div>
<div><font face="tahoma, sans-serif">
<txn:county>Door</txn:county></font></div>
<div><font face="tahoma, sans-serif"> <txn:localityText>Town
of Sevastopol</txn:localityText></font></div>
<div><font face="tahoma, sans-serif">
<txn:locationName>Shivering Sands Natural Area
Woods</txn:locationName></font></div>
<div><font face="tahoma, sans-serif"> <txn:areaHasOccurrence
rdf:resource="<a moz-do-not-send="true"
href="http://ocs.taxonconcept.org/ocs/f522444a-2dd9-400e-be59-47213ef38cb9#Occurrence"
style="color: rgb(51, 51, 204);" target="_blank">http://ocs.taxonconcept.org/ocs/f522444a-2dd9-400e-be59-47213ef38cb9#Occurrence</a>"/></font></div>
<div><font face="tahoma, sans-serif">
<txn:areaHasObservedSpeciesConcept rdf:resource="<a
moz-do-not-send="true"
href="http://lod.taxonconcept.org/ses/ICmLC#Species"
style="color: rgb(51, 51, 204);" target="_blank">http://lod.taxonconcept.org/ses/ICmLC#Species</a>"/></font></div>
<div><font face="tahoma, sans-serif"> <txn:areaHasIndividual
rdf:resource="<a moz-do-not-send="true"
href="http://ocs.taxonconcept.org/ocs/f522444a-2dd9-400e-be59-47213ef38cb9#Individual"
style="color: rgb(51, 51, 204);" target="_blank">http://ocs.taxonconcept.org/ocs/f522444a-2dd9-400e-be59-47213ef38cb9#Individual</a>"/></font></div>
<div><font face="tahoma, sans-serif"> <txn:areaInStateProvince
rdf:resource="<a moz-do-not-send="true"
href="http://sws.geonames.org/5279468/"
style="color: rgb(51, 51, 204);" target="_blank">http://sws.geonames.org/5279468/</a>"/></font></div>
<div><font face="tahoma, sans-serif"> <txn:areaInCounty
rdf:resource="<a moz-do-not-send="true"
href="http://sws.geonames.org/5250768/"
style="color: rgb(51, 51, 204);" target="_blank">http://sws.geonames.org/5250768/</a>"/></font></div>
<div><font face="tahoma, sans-serif"> <wdrs:describedBy
rdf:resource="<a moz-do-not-send="true"
href="http://ocs.taxonconcept.org/ocs/f522444a-2dd9-400e-be59-47213ef38cb9.rdf"
style="color: rgb(51, 51, 204);" target="_blank">http://ocs.taxonconcept.org/ocs/f522444a-2dd9-400e-be59-47213ef38cb9.rdf</a>"/></font></div>
<div><font face="tahoma, sans-serif"> </dwc_area:Area></font></div>
</div>
<div><font face="tahoma, sans-serif"><br>
</font></div>
<div><font face="tahoma, sans-serif">I recently added the following
predicates, but have not altered my RDF examples.</font></div>
<div><font face="tahoma, sans-serif"><br>
</font></div>
</span></div>
<div>
<meta charset="utf-8">
<span class="Apple-style-span"
style="font-family: arial,sans-serif; font-size: 13px; border-collapse: collapse;">
<div>#featureContainsArea</div>
<div>#areaWithInFeature</div>
<div><br>
</div>
<div><a moz-do-not-send="true"
href="http://lod.taxonconcept.org/ontology/dwc_area.owl"
target="_blank" style="color: rgb(51, 51, 204);">http://lod.taxonconcept.org/ontology/dwc_area.owl</a><br>
</div>
<div><br>
</div>
<div>OWL Doc <a moz-do-not-send="true"
href="http://lod.taxonconcept.org/ontology/dwc_area_doc/index.html"
target="_blank" style="color: rgb(51, 51, 204);">http://lod.taxonconcept.org/ontology/dwc_area_doc/index.html</a></div>
<div><br>
</div>
<div>The predicates are a bit awkward, but I wanted to be clear that
this was to link an "Area" like <span
style="font-family: tahoma,sans-serif; font-size: 13px; border-collapse: collapse;">"geo:44.86528100,-87.23147800;u=10" </span>to
a Geonames "Feature".</div>
<div><br>
</div>
<div>I thought a different set of predicates could be created to deal
with some other class of "SpatialThing" if needed.</div>
<div><br>
</div>
<div>Respectfully,</div>
<div><br>
</div>
<div>- Pete</div>
<div><br>
</div>
</span>---------------------------------------------------------------<br>
Pete DeVries<br>
Department of Entomology<br>
University of Wisconsin - Madison<br>
445 Russell Laboratories<br>
1630 Linden Drive<br>
Madison, WI 53706<br>
<a moz-do-not-send="true" href="http://www.taxonconcept.org/"
target="_blank">TaxonConcept Knowledge Base</a> / <a
moz-do-not-send="true" href="http://lod.geospecies.org/"
target="_blank">GeoSpecies Knowledge Base</a><br>
<a moz-do-not-send="true" href="http://about.geospecies.org/"
target="_blank">About the GeoSpecies Knowledge Base</a><br>
------------------------------------------------------------<br>
</div>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Steven J. Baskauf, Ph.D., Senior Lecturer
Vanderbilt University Dept. of Biological Sciences
postal mail address:
VU Station B 351634
Nashville, TN 37235-1634, U.S.A.
delivery address:
2125 Stevenson Center
1161 21st Ave., S.
Nashville, TN 37235
office: 2128 Stevenson Center
phone: (615) 343-4582, fax: (615) 343-6707
<a class="moz-txt-link-freetext" href="http://bioimages.vanderbilt.edu">http://bioimages.vanderbilt.edu</a>
</pre>
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