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<div class="Normal"><span style='font-size: 10pt; '>I do have 2 simple
linestrings which partly have the same geometry (see attached dump and image).
My aim is to detect the common part of these two linestrings with the following
query:</span></div>
<br>
<div class="Normal"><span style='font-size: 10pt; '>select
st_intersection(a.the_geom, b.the_geom),
a.myid</span><br><span style='font-size: 10pt; '>from aline1,
aline2</span></div>
<br>
<div class="Normal"><span style='font-size: 10pt; '>But as the result I get a
geometrycollection with one POINT and one LINESTING. I expected one linestring.
Is it a bug??</span><br><span style='font-size: 10pt; '>I'll appreciate any
hints.</span></div>
<br>
<div class="Normal"><span style='font-size: 10pt; '>My
system:</span><br><span style='font-size: 10pt; '>Postgis
1.4.0</span><br><span style='font-size: 10pt; '>Geos
3.1.1</span><br><span style='font-size: 10pt; '>Postgres 8.3.6</span></div>
<br>
<div class="Normal"><span style='font-size: 10pt; '>Best regards</span></div>
<br>
<div class="Normal"><span style='font-size: 10pt; '>Dr. Horst
Düster</span><br><span style='font-size: 10pt; '>Stv. Amtschef /
GIS-Koordinator </span></div>
<br>
<div class="Normal"><span style='font-size: 10pt; '>Kanton
Solothurn</span><br><span style='font-size: 10pt; '>Bau- und
Justizdepartement</span><br><span style='font-size: 10pt; '>Amt für
Geoinformation</span><br><span style='font-size: 10pt; '>SO!GIS
Koordination</span><br><span style='font-size: 10pt; '>Rötistrasse
4</span><br><span style='font-size: 10pt; '>CH-4501 Solothurn</span></div>
<br>
<div class="Normal"><span style='font-size: 10pt; '>Telefon ++41(0)32 627 25
32</span><br><span style='font-size: 10pt; '>Telefax ++41(0)32 627 22
14</span></div>
<br>
<div class="Normal"><span style='font-size: 10pt; '>mailto:horst.duester@bd.so.ch</span><br><span style='font-size: 10pt; '>http://www.agi.so.ch</span></div>
<br>
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