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As an aside, I am noticing these graphics probably aren't very
accessible to people with vision impairments. There is a lack of
meaningful alt-text, a general fuzziness/soft edges, and use of
several colors of similar lightness. In particular, the red is hard
to separate out in grayscale and the red is the part that is most
important as it is describing the part of the image that applies to
that grid cell.<br>
<br>
I'm not sure if it will come through on the list, but I've converted
the 3x3 grid image from [1] to grayscale below as an example. I
know I'd have a very hard time picking out which section was what if
I didn't already know the answer ahead of time.<br>
<br>
<img src="cid:part1.SsbiKM00.TkmiUo3r@gmail.com" alt=""><br>
<br>
[1] <a class="moz-txt-link-freetext" href="https://postgis.net/workshops/postgis-intro/_images/de9im3.jpg">https://postgis.net/workshops/postgis-intro/_images/de9im3.jpg</a><br>
<br>
<div class="moz-cite-prefix">On 4/15/22 15:08, Shaozhong SHI wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CA+i5JwZO9wzN3UHTTQ1a-jSh1wUWqP1BAFb1JsT_XWr-VUbW7A@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">This is very interesting.
<div><br>
</div>
<div>However, this needs to be further detailed with a table to
explain a variety of cases and uses.</div>
<div><br>
</div>
<div>Regards, </div>
<div><br>
</div>
<div>David</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, 15 Apr 2022 at 02:48,
Paul Ramsey <<a href="mailto:pramsey@cleverelephant.ca"
moz-do-not-send="true" class="moz-txt-link-freetext">pramsey@cleverelephant.ca</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><a
href="https://postgis.net/workshops/postgis-intro/de9im.html"
rel="noreferrer" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://postgis.net/workshops/postgis-intro/de9im.html</a><br>
<br>
> On Apr 14, 2022, at 4:35 PM, Shaozhong SHI <<a
href="mailto:shishaozhong@gmail.com" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">shishaozhong@gmail.com</a>>
wrote:<br>
> <br>
> The use of ST_Relate appears very attractive. However,
there appears not yet a table detailing DE_9IE patterns and
types of topological relations.<br>
> <br>
> There also appears that not much literature on the use of
it for data quality assurance or things like deriving quality
data from raw data.<br>
> <br>
> Can anyone enlighten me?<br>
> <br>
> Regards,<br>
> <br>
> David<br>
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