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<div class="moz-cite-prefix">... doesn't the accuracy of the
displayed results (besides internal algorithms for display) depend
to some extant on the original satellite data? Back in mid 2000 we
received absolutely weird results from our GPS devices standing by
the river, while the GPS located us on the hill over there, even
though we had good satellite coverage.</div>
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<div class="moz-cite-prefix">Also, if tracing locations from
historic maps or published locality maps and reverse
georeferencing, you will always have some sort of imprecision.
There is a risk of false accuracy, and it is worth noting (in
databases and preferably on the remarks on jar labels), if online
georeferencing were used (and which). Can be a challenge on insect
labels, of course.<br>
</div>
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<div class="moz-cite-prefix"> Last autumn I (finally) found in a
publication one of the lovely hand-drawn b/w station maps (one of
those which kept authors busy with the India-ink pen for days)
from the late 1970ies. When translating these dots back into GPS
coordinates, getting as close as 5-10 miles was really good. <br>
</div>
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Not directly connects to Doug's original post/question, but perhaps
worth noting - of course you want to be as close as you can get and
pin-point original locations as best as possible<br>
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<div class="moz-cite-prefix">Dirk<br>
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<div class="moz-cite-prefix">Am 06.01.2022 um 21:43 schrieb Mare
Nazaire:<br>
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cite="mid:CAGsrPoJcNL6nUANGCmivkgqf7gR-wTEy9QHapFEpUQ+VJaYdjQ@mail.gmail.com">
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<div dir="ltr">As I understand it, GeoLocate does have a measuring
tool to measure road miles. I never just use one georeferencing
program - I use GeoLocate and Google Earth together and make
sure that I am getting consistent results, because you can run
into discrepancies, as you have pointed out.
<div><br>
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<div>~Mare</div>
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<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu, Jan 6, 2022 at 11:43
AM Douglas Yanega <<a href="mailto:dyanega@gmail.com"
moz-do-not-send="true" class="moz-txt-link-freetext">dyanega@gmail.com</a>>
wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<div>On 1/6/22 11:03 AM, Marie Angel wrote:<br>
</div>
<blockquote type="cite"> Hi,
<div><br>
</div>
<div>In Geolocate’s collaborative georeferencing web
client (<a
href="https://www.geo-locate.org/web/WebComGeoref.aspx"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://www.geo-locate.org/web/WebComGeoref.aspx</a>),
if you click on the small blue and white plus sign on
the right side, it will show different base layers and
overlays. Under “overlays” there is an option to show US
counties.</div>
<div><br>
</div>
<div>I hope this helps!</div>
</blockquote>
<p>Hi, Marie.</p>
<p>Now that you point out where this feature is, it's good
to see that they have it. However, what would help here is
if GeoLocate had a more user-friendly interface. I can't
see how you and other using GL can deal with specimen
label data capture without introducing unnecessary
uncertainty.</p>
<p>Consider this specimen label:</p>
<p>17 mi W Carrizozo, Lincoln Co., NM</p>
<p>Unless I'm missing something, GeoLocate does not have a
tool to create a path that measures <b>exactly 17 road
miles</b> W of Carrizozo. Google Earth does. It turns
out, in fact, using Google Earth with the county lines
layer restored, that this locality label is wrong, because
if you drive 17 miles west from Carrizozo (there's only
one road, and it goes mostly NW), you cross the county
line into Socorro county at around 13 miles. I don't see a
way to tell in GL how far that county line is from
Carrizozo, the way you can using Google Earth.</p>
<p>When I was researching georeferencing protocols for
legacy specimens (anything without lat/long data on the
label) for a major NSF grant, I did numerous side-by-side
comparisons of various available tools, and while
GeoLocate gave very rapid answers, it always
underperformed in terms of accuracy, with a much higher
error rate and uncertainty radius compared to manual
lookups using Google Earth. Points generated using GL
would often be several miles away from the actual
location, so what one saved in time (admittedly
substantial) was undermined by a very significant loss of
accuracy. I can give very concrete examples, for anyone
interested in nitpicky details.</p>
<p>Thanks,<br>
</p>
<pre cols="72">--
Doug Yanega Dept. of Entomology Entomology Research Museum
Univ. of California, Riverside, CA 92521-0314 skype: dyanega
phone: (951) 827-4315 (disclaimer: opinions are mine, not UCR's)
<a href="https://faculty.ucr.edu/~heraty/yanega.html" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">https://faculty.ucr.edu/~heraty/yanega.html</a>
"There are some enterprises in which a careful disorderliness
is the true method" - Herman Melville, Moby Dick, Chap. 82</pre>
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<div dir="ltr"><font color="#93c47d"><span
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