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<DIV dir=ltr align=left><FONT face=Arial color=#0000ff><SPAN
class=850454701-12102009>Ihab,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff><SPAN
class=850454701-12102009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff><SPAN
class=850454701-12102009>You don't need to use Makeline to determine they are
the same. In fact I thin that may crash. Just use ST_Intersects
and ST_Z()</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff><SPAN
class=850454701-12102009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff><SPAN
class=850454701-12102009><A
href="http://www.postgis.org/documentation/manual-svn/ST_Z.html">http://www.postgis.org/documentation/manual-svn/ST_Z.html</A></SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff><SPAN
class=850454701-12102009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff><SPAN
class=850454701-12102009>So</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff><SPAN
class=850454701-12102009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT><SPAN class=850454701-12102009>
<DIV dir=ltr align=left><SPAN class=695185020-11102009><FONT face=Arial
color=#0000ff>SELECT DISTINCT ON(try1.gid) try1.gid,
try1.the_geom</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=695185020-11102009><FONT face=Arial><FONT
color=#0000ff>FROM try1 INNER JOIN try11 ON <SPAN
class=850454701-12102009>( </SPAN>ST_Intersects(try1.the_geom,
try11.the_geom)<SPAN class=850454701-12102009> AND ST_Z(try1.the_geom) =
ST_Z(try11.the_geom) )</SPAN></FONT></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=695185020-11102009><FONT face=Arial><FONT
color=#0000ff>ORDER BY try1.gid</FONT></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=695185020-11102009><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=695185020-11102009><SPAN
class=850454701-12102009><FONT face=Arial color=#0000ff>Hope that
helps,</FONT></SPAN></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=695185020-11102009><SPAN
class=850454701-12102009><FONT face=Arial
color=#0000ff>Regina</FONT></SPAN></SPAN></DIV></SPAN></FONT></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma><B>From:</B> eehab hamzeh [mailto:eehab40@hotmail.com]
<BR><B>Sent:</B> Sunday, October 11, 2009 5:36 PM<BR><B>To:</B>
lr@pcorp.us<BR><B>Subject:</B> if two points intersect in
3d<BR></FONT><BR></DIV>
<DIV></DIV>Thanks for your replay, <BR> <BR>I need to check the
intersection using lengith3d since the points are in 3D space. so i need to know
exactly if they are really intersect.<BR> <BR>can you please help me to
develop the query below to give me the result<BR> <BR> <BR>SELECT a,b
from try1 as a, try11 as b WHERE ST_Length3d(ST_MakeLine(a.the_geom,
b.the_geom)) = 0;<BR><BR> <BR>Kind regards<BR>ihab<BR> <BR>Do a
join<BR><BR>SELECT DISTINCT ON(try1.gid) try1.gid, try1.the_geom<BR>FROM
try1 INNER JOIN try11 ON ST_Intersects(try1.the_geom, try11.the_geom)<BR>ORDER
BY try1.gid<BR><BR>Will give you all the points in try1 that are in
try11.<BR><BR><BR><BR><BR> _____ <BR><BR>From: <A
href="http://postgis.refractions.net/mailman/listinfo/postgis-users">postgis-users-bounces
at postgis.refractions.net</A><BR>[mailto:<A
href="http://postgis.refractions.net/mailman/listinfo/postgis-users">postgis-users-bounces
at postgis.refractions.net</A>] On Behalf Of eehab<BR>hamzeh<BR>Sent: Sunday,
October 11, 2009 3:44 PM<BR>To: <A
href="http://postgis.refractions.net/mailman/listinfo/postgis-users">postgis-users
at postgis.refractions.net</A><BR>Subject: [postgis-users] check distance
between points in table<BR><BR><BR>Hello<BR><BR>I have two tables one its name
try1 and the second are try11 i need to check<BR>if any point in try1 and any
point in try11 are the same.<BR>i wrote the following fucntion .... But i cant
recive resutls<BR><BR>any directions <BR><BR>-- Function: dis3d(geometry)<BR>--
DROP FUNCTION dis3d(geometry);<BR>CREATE OR REPLACE FUNCTION dis3d(point
geometry)<BR> RETURNS boolean AS<BR>$BODY$<BR>DECLARE<BR>r
try1%rowtype;<BR>BEGIN<BR>for r in select r.the_geom from try1 loop<BR> --
TODO: use && and index <BR>perform the_geom FROM try1 WHERE
<BR>ST_Length3d(ST_MakeLine(the_geom, point)) = 0;<BR> <BR> IF
FOUND THEN<BR> insert into result(the_geom) select
r.the_geom;<BR> ELSE<BR> EXIT;<BR> END IF;<BR>END
LOOP;<BR>RETURN true;<BR>END;<BR>$BODY$<BR> LANGUAGE 'plpgsql' VOLATILE
STRICT<BR> COST 100;<BR>ALTER FUNCTION dis3d(geometry) OWNER TO
postgres;<BR><---------<BR>select dis3d(the_geom) from
try11 <BR><BR><BR><BR>
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