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List: postgis-users
Subject: Re: [postgis-users] <-> operator does not return true distance
From: Jakob Miksch <Jakob.Miksch () nina ! no>
Date: 2017-08-01 12:49:17
Message-ID: ca06f710f3e34f37ac866ad2ae6303b6 () NINSRV23 ! nina ! no
[Download RAW message or body]
Hello Regina,
Thanks for your helpful response. Indeed there was a problem with the updat=
e of PostGIS.
We fixed it and now everything works like it should.
Kind regards,
Jakob
From: postgis-users [mailto:postgis-users-bounces@lists.osgeo.org] On Behal=
f Of Regina Obe
Sent: torsdag 13. juli 2017 22.51
To: 'PostGIS Users Discussion' <postgis-users@lists.osgeo.org>
Subject: Re: [postgis-users] <-> operator does not return true distance
Jakob,
Did you upgrade your install from an older version say 9.4.
I think if you did a pg_upgrade, and didn't do a ALTER EXTENSION postgis...=
after upgrade, this would explain your issue since the operators would not=
get upgraded.
On my PostGIS 2.3.2, 9.6 behavior is as expected. Unfortunately I don't ha=
ve 2.2.2 lying around at moment.
Also there was an ordering bug I think in 2.2 early version that may have c=
aused this. If that is your issue, then output of <-> would be real even t=
hough ordering is wrong.
Try this query:
SELECT id,
ST_Distance(my_point.geom,
my_polygons.geom) AS real_distance,
ST_Distance(my_point.geom,
ST_Centroid(my_polygons.geom)) AS centroid_distance, my=
_point.geom <-> my_polygons.geom
FROM (
SELECT 'blue' AS id, ST_Polygon(ST_GeomFromText('LINESTRING(0 3, 2 3, =
2 4, 0 4 ,0 3)'),4326) AS geom
UNION
SELECT 'green' AS id, ST_Polygon(ST_GeomFromText('LINESTRING(2 0, 8 0 =
, 8 2, 2 2 ,2 0)'),4326) AS geom
) AS my_polygons,
(
SELECT ST_SetSRID(ST_Point(1, 1),4326) AS geom
) AS my_point
ORDER BY my_point.geom <-> my_polygons.geom
-- output should be --
id | real_distance | centroid_distance | ?column?
-------+---------------+-------------------+----------
green | 1 | 4 | 1
blue | 2 | 2.5 | 2
(2 rows)
Hope that helps,
Regina
http://postgis.us
http://www.paragoncorporation.com
From: postgis-users [mailto:postgis-users-bounces@lists.osgeo.org] On Behal=
f Of Jakob Miksch
Sent: Thursday, July 13, 2017 4:27 AM
To: postgis-users@lists.osgeo.org<mailto:postgis-users@lists.osgeo.org>
Subject: [postgis-users] <-> operator does not return true distance
Hi,
(I asked a similar question here https://gis.stackexchange.com/questions/24=
7034/postgis-operator-does-not-return-true-distance )
I used the <-> operator with PostGIS 2.2.2 and PostgreSQL 9.5.7 .
According to the docs (http://postgis.net/docs/manual-2.2/geometry_distance=
_knn.html) the <-> operator should order by "true KNN distance" and *not* b=
y "centroid distance".
However it does not work for me. See the minimal example below:
( illustration: https://i.stack.imgur.com/QZA6D.png )
SELECT id,
ST_Distance(my_point.geom,
my_polygons.geom) AS real_distance,
ST_Distance(my_point.geom,
ST_Centroid(my_polygons.geom)) AS centroid_distance
FROM (
SELECT 'blue' AS id, ST_Polygon(ST_GeomFromText('LINESTRING(0 3, 2 3, =
2 4, 0 4 ,0 3)'),4326) AS geom
UNION
SELECT 'green' AS id, ST_Polygon(ST_GeomFromText('LINESTRING(2 0, 8 0 =
, 8 2, 2 2 ,2 0)'),4326) AS geom
) AS my_polygons,
(
SELECT ST_SetSRID(ST_Point(1, 1),4326) AS geom
) AS my_point
ORDER BY my_point.geom <-> my_polygons.geom
--- obtained Result:
| | real_distance | centroid_distance |
---------------------------------------------
| blue | 2 | 2.5 |
| green | 1 | 4 |
(I expected the rows to be in the opposite order)
Apparently the <-> operator orders by the centroid_distance and not by the =
real_distance, even though the docs say: "[...] for PostgreSQL 9.5+, does t=
rue KNN distance search giving true distance between geometries [...]"
I tried the same example on 2.3.2 and PostgreSQL 9.5.7 and I get the expect=
ed result (which orders by "real_distance").
So, for me it seems that ordering by "real_distance" with the <-> operator =
does not work with PostGIS 2.2.2 - but this is *not* written in the docs.
Can you reproduce this behaviour? Or did I understand/make something wrong =
here?
Thanks and best regards,
Jakob
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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hello \
Regina,<o:p></o:p></span></p> <p class="MsoNormal"><span \
style="mso-fareast-language:EN-US"><o:p> </o:p></span></p> <p \
class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Thanks for \
your helpful response. Indeed there was a problem with the update of PostGIS. \
<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-GB" \
style="mso-fareast-language:EN-US">We fixed it and now everything works like it \
should.<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-GB" \
style="mso-fareast-language:EN-US"><o:p> </o:p></span></p> <p \
class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Kind \
regards,<br> Jakob<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" \
style="mso-fareast-language:EN-US"><o:p> </o:p></span></p> <div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> \
postgis-users [mailto:postgis-users-bounces@lists.osgeo.org] <b>On Behalf Of \
</b>Regina Obe<br> <b>Sent:</b> torsdag 13. juli 2017 22.51<br>
<b>To:</b> 'PostGIS Users Discussion' <postgis-users@lists.osgeo.org><br>
<b>Subject:</b> Re: [postgis-users] <-> operator does not return true \
distance<o:p></o:p></span></p> </div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D">Jakob,<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Did you upgrade your \
install from an older version say 9.4.<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="color:#1F497D">I think if you did a pg_upgrade, and didn't do a \
ALTER EXTENSION postgis… after upgrade, this would explain your issue since the \
operators would not get upgraded.<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="color:#1F497D">On my PostGIS 2.3.2, 9.6 behavior is as \
expected. Unfortunately I don't have 2.2.2 lying around at \
moment.<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="color:#1F497D">Also there was an ordering bug I think in 2.2 \
early version that may have caused this. If that is your issue, then output of \
<-> would be real even though ordering is wrong.<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="color:#1F497D">Try this query:<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="color:#1F497D">SELECT id,<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D"> ST_Distance(my_point.geom, \
<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D"> my_polygons.geom) \
AS real_distance,<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D"> \
ST_Distance(my_point.geom, <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D"> ST_Centroid(my_polygons.geom)) \
AS centroid_distance, my_point.geom <-> my_polygons.geom \
<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="color:#1F497D">FROM (<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" style="color:#1F497D"> SELECT \
'blue' AS id, ST_Polygon(ST_GeomFromText('LINESTRING(0 3, 2 3, 2 4, 0 4 ,0 \
3)'),4326) AS geom<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D"> UNION<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" style="color:#1F497D"> SELECT \
'green' AS id, ST_Polygon(ST_GeomFromText('LINESTRING(2 0, 8 0 , 8 2, 2 2 ,2 \
0)'),4326) AS geom<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="color:#1F497D">) AS my_polygons,<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="color:#1F497D">(<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="color:#1F497D"> SELECT ST_SetSRID(ST_Point(1, \
1),4326) AS geom<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D">) AS my_point<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" style="color:#1F497D">ORDER BY my_point.geom \
<-> my_polygons.geom<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" style="color:#1F497D">-- output should be \
--<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="color:#1F497D"> id | real_distance | \
centroid_distance | ?column?<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="color:#1F497D">-------+---------------+-------------------+----------<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="color:#1F497D">green \
| 1 \
| \
4 | 1<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" style="color:#1F497D">blue \
| 2 \
| \
2.5 | 2<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" style="color:#1F497D">(2 \
rows)<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="color:#1F497D"><o:p> </o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" style="color:#1F497D">Hope that \
helps,<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D">Regina<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US" style="color:#1F497D"><a \
href="http://postgis.us">http://postgis.us</a><o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US" style="color:#1F497D"><a \
href="http://www.paragoncorporation.com">http://www.paragoncorporation.com</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" \
style="color:#1F497D"><o:p> </o:p></span></p> <div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal" style="margin-left:36.0pt"><b><span \
lang="EN-US">From:</span></b><span lang="EN-US"> postgis-users [<a \
href="mailto:postgis-users-bounces@lists.osgeo.org">mailto:postgis-users-bounces@lists.osgeo.org</a>]
<b>On Behalf Of </b>Jakob Miksch<br>
<b>Sent:</b> Thursday, July 13, 2017 4:27 AM<br>
<b>To:</b> <a href="mailto:postgis-users@lists.osgeo.org">postgis-users@lists.osgeo.org</a><br>
<b>Subject:</b> [postgis-users] <-> operator does not return true \
distance<o:p></o:p></span></p> </div>
</div>
<p class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-US"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB">Hi, <o:p></o:p></span></p> <p \
class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-GB"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB">(I asked a similar question here <a \
href="https://gis.stackexchange.com/questions/247034/postgis-operator-does-not-return-true-distance">
https://gis.stackexchange.com/questions/247034/postgis-operator-does-not-return-true-distance</a> \
)<o:p></o:p></span></p> <p class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-GB"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB">I used the <-> operator with \
PostGIS 2.2.2 and PostgreSQL 9.5.7 .<o:p></o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p> <p \
class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">According to the docs \
(<a href="http://postgis.net/docs/manual-2.2/geometry_distance_knn.html">http://postgis.net/docs/manual-2.2/geometry_distance_knn.html</a>) \
the <-> operator should order by "true KNN distance" and *not* by \
"centroid distance". <o:p></o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p> <p \
class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">However it does not \
work for me. See the minimal example below: <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">( \
illustration: <a \
href="https://i.stack.imgur.com/QZA6D.png">https://i.stack.imgur.com/QZA6D.png</a> \
)<o:p></o:p></span></p> <p class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-GB"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB">SELECT id,<o:p></o:p></span></p> <p \
class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-GB"> ST_Distance(my_point.geom, \
<o:p></o:p></span></p> <p class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-GB"> my_polygons.geom) \
AS real_distance,<o:p></o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB"> \
ST_Distance(my_point.geom, <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-GB"> ST_Centroid(my_polygons.geom)) \
AS centroid_distance<o:p></o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p> <p \
class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">FROM \
(<o:p></o:p></span></p> <p class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-GB"> SELECT 'blue' AS id, \
ST_Polygon(ST_GeomFromText('LINESTRING(0 3, 2 3, 2 4, 0 4 ,0 3)'),4326) AS \
geom<o:p></o:p></span></p> <p class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-GB"> UNION<o:p></o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB"> SELECT 'green' AS \
id, ST_Polygon(ST_GeomFromText('LINESTRING(2 0, 8 0 , 8 2, 2 2 ,2 0)'),4326) AS \
geom<o:p></o:p></span></p> <p class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-GB"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB">) AS my_polygons,<o:p></o:p></span></p> \
<p class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-GB"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB">(<o:p></o:p></span></p> <p \
class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB"> \
SELECT ST_SetSRID(ST_Point(1, 1),4326) AS geom<o:p></o:p></span></p> <p \
class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">) AS \
my_point<o:p></o:p></span></p> <p class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-GB"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB">ORDER BY my_point.geom <-> \
my_polygons.geom <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-GB"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p> <p \
class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">--- obtained \
Result:<o:p></o:p></span></p> <p class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-GB"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p> <p \
class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-GB">| | real_distance | \
centroid_distance |<o:p></o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span \
lang="EN-GB">---------------------------------------------<o:p></o:p></span></p> <p \
class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">| blue \
| 2 \
| \
2.5 |<o:p></o:p></span></p> <p \
class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">| green \
| 1 \
| \
4 |<o:p></o:p></span></p> <p \
class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-GB"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB">(I expected the rows to be in the \
opposite order)<o:p></o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p> <p \
class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">Apparently the \
<-> operator orders by the centroid_distance and not by the real_distance, even \
though the docs say: "[...] for PostgreSQL 9.5+, does true KNN distance \
search giving true distance between geometries [...]"<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-GB"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB">I tried the same example on 2.3.2 and \
PostgreSQL 9.5.7 and I get the expected result (which orders by \
"real_distance").<o:p></o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB"><o:p> </o:p></span></p> <p \
class="MsoNormal" style="margin-left:36.0pt"><span lang="EN-GB">So, for me it seems \
that ordering by "real_distance" with the <-> operator does not work \
with PostGIS 2.2.2 - but this is *not* written in the docs.<o:p></o:p></span></p> <p \
class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-GB"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt"><span lang="EN-GB">Can you reproduce this behaviour? Or \
did I understand/make something wrong here?<o:p></o:p></span></p> <p \
class="MsoNormal" style="margin-left:36.0pt"><span \
lang="EN-GB"><o:p> </o:p></span></p> <p class="MsoNormal" \
style="margin-left:36.0pt">Thanks and best regards,<o:p></o:p></p> <p \
class="MsoNormal" style="margin-left:36.0pt">Jakob<o:p></o:p></p> </div>
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