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<div class="moz-cite-prefix">On 2014-06-09 19:14, Marc Gemis wrote :<br>
</div>
<blockquote
cite="mid:CAJKJX-Q+ZWf8kXgULtiB0RUhv=KEy9ZKez-Gr2vRmadfy77kiA@mail.gmail.com"
type="cite">
<div dir="ltr">I don't understand the real value of survey:date or
whatever other key you want to use to indicate the last survey
date. Sometimes things do not change for many years, sometimes
they change the day after the survey was done.</div>
</blockquote>
The idea is simple.<br>
<br>
Assuming no change for many years, different persons could come say
every week to check for a change.<br>
The survey key tells the next one to come that it's not really
necessary to check again.<br>
Or, put more properly, serves to establish a priority list so that
long dated surveys are refreshed first.<br>
<br>
One cannot help a change happening just after a survey, it will wait
its turn.<br>
<blockquote
cite="mid:CAJKJX-Q+ZWf8kXgULtiB0RUhv=KEy9ZKez-Gr2vRmadfy77kiA@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>I'm struggling with this "resurvey" item as well. I've been
mapping my area for 3 years now. Many things have changed: new
walking paths, new streets, new one ways (it changed 3 times
in the same street now). Sometimes I remember that things have
changed, sometimes not (e.g. new benches, a shop moved next
door, a bakery that changed name). And that is for an area
that I know rather well. <br>
</div>
</div>
</blockquote>
It would be a valid point to say that some features need more
frequent survey.<br>
But it's up to the contributors to select them in their queries to
apply a priority.<br>
It's complicated enough already to have it worked simply.<br>
<blockquote
cite="mid:CAJKJX-Q+ZWf8kXgULtiB0RUhv=KEy9ZKez-Gr2vRmadfy77kiA@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>For places where I come less regularly I will probably miss
all those changes, unless I do a complete resurvey of the
area.</div>
<div><br>
</div>
<div>What if the previous mapper doesn't survey the same things
I map ? What's the use of the survey date in that case?</div>
</div>
</blockquote>
That is the point I raised that unlike source=... survey:date
applies to all aspect of a map element.<br>
<blockquote
cite="mid:CAJKJX-Q+ZWf8kXgULtiB0RUhv=KEy9ZKez-Gr2vRmadfy77kiA@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>For me, in most cases the source is useless. If I notice
something that is different now, it doesn't matter what the
previous mapper wrote as source. I have to change it.</div>
<div><br>
</div>
<div>
I do tag my changesets with survey:date for quite a while now,
but that is to find back my notes. And this tag is mentioned
on the main map feature page <a moz-do-not-send="true"
href="http://wiki.openstreetmap.org/wiki/Map_Features#Annotation">http://wiki.openstreetmap.org/wiki/Map_Features#Annotation</a>
. </div>
<div><br>
</div>
<div>Furthermore, as you indicate the survey:date is on a
changeset, but which area was revisited, what did the mapper
survey ? You don't know.</div>
<div><br>
</div>
<div>So in summary: for me all source tags are pretty useless,
and I need to resurvey any area completely each time I visit
it.</div>
<div><br>
</div>
<div>regards</div>
<div><br>
</div>
<div>m</div>
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<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Mon, Jun 9, 2014 at 6:01 PM, André
Pirard <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:A.Pirard.Papou@gmail.com" target="_blank">A.Pirard.Papou@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
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<div text="#000000" bgcolor="#FFFFFF">
<div>On 2014-06-09 11:59, Glenn Plas wrote :<br>
</div>
<div class="">
<blockquote type="cite">
<div>On 09-06-14 08:31, André Pirard wrote:<br>
</div>
<blockquote type="cite"> Hi,<br>
<br>
Some data of the map changes often, in particular
what's on the road: traffic signs, bus lines etc.<br>
It would be interesting if someone tackling a region
could determine what in his interests was checked
the longest ago. Hence the need for a date at the
beginning of the data that is not of the source of
information if any but that indicates when that
source, visual observation or other was still
current last. The someone would deal with the oldest
in priority and update that date if that can be
said. The data field of the query result would be
sorted to determine the oldest ones.<br>
Is the source:survey date appropriate for that,
pardon my limited English ...<br>
</blockquote>
Hi Andre,<br>
<br>
I think that the correct key is survey:date. <br>
</blockquote>
</div>
Thank you for replying and confirming that high precision
is needed in this too fuzzy OSM world.<br>
I found no "survey:" key, if I look for <a
moz-do-not-send="true"
href="http://wiki.openstreetmap.org/wiki/survey"
target="_blank">http://wiki.openstreetmap.org/wiki/survey</a>,
it falls back on key:source <a moz-do-not-send="true"
href="http://wiki.openstreetmap.org/wiki/Survey#Annotation"
target="_blank">http://wiki.openstreetmap.org/wiki/Survey#Annotation</a>
(which is a non existing label).<br>
What I'm talking about is <a moz-do-not-send="true"
href="http://wiki.openstreetmap.org/wiki/Key:source"
title="Key:source" target="_blank">Key:<span>source</span></a>
and more specifically its phrase <tt
style="background-color:#dde;white-space:pre-wrap"
dir="ltr"><a moz-do-not-send="true"
href="http://wiki.openstreetmap.org/wiki/Key:source:name"
title="Key:source:name" target="_blank">"source:name</a>=survey
10 November 2012"</tt>.<br>
That is, data consisting of lowercase "survey" followed by
a mandatory one and only single blank...
<div class=""><br>
<blockquote type="cite"> KeyMapper 3 also uses it. </blockquote>
</div>
<a moz-do-not-send="true"
href="http://wiki.openstreetmap.org/wiki/Keypad-Mapper_3#new_features_version_3.1"
target="_blank">Using an URL to spare 50 people a search</a>,
indeed, thanks.<br>
So, either we warn Keymapper that they use unofficial
tagging that escapes an overpass search,<br>
or I still have to learn what many people are trying to
teach me: that OSM is nothing but fuzzy (sending cars the
wrong one-way) and that the overpass query has to be extra
huge.<br>
survey:date is not providing for telling what has been <br>
<div class="">
<blockquote type="cite">It's a good idea to start
including this in my regular edits, I'm going to add
those as well. There is added value in it. I think
it's best to do this on the changeset but that might
go unnoticed when editing, also in josm.<br>
</blockquote>
</div>
It's useful in JOSM to save ourselves checking the same
element 36 times but mostly with overpass to make oneself
a to do list.
<div class=""><br>
<blockquote type="cite">But that tag on every object
seems like overkill.<br>
</blockquote>
</div>
Of course, only what often "changes without notice".<br>
<br>
At first sight, the overpass API is able to use a regexp
to look for data but not for keys.<br>
Any trick?<span class="HOEnZb"><font color="#888888"><br>
<br>
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<td>André.</td>
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