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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Sir,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Doh…brain cramp. That was the trick. Thanks for the big stick
upside the head!<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Regards,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Jim<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> postgis-users-bounces@postgis.refractions.net
[mailto:postgis-users-bounces@postgis.refractions.net] <b>On Behalf Of </b>Brian
Modra<br>
<b>Sent:</b> Wednesday, September 30, 2009 12:38 PM<br>
<b>To:</b> PostGIS Users Discussion<br>
<b>Subject:</b> Re: [postgis-users] linestring clipping problem<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>Create a new clip polygon which
is the differenec between the blue one and the outer rectangle. then aply that
one as you did the blue one.<o:p></o:p></p>
<div>
<p class=MsoNormal>2009/9/30 James G Wilkinson <<a
href="mailto:jgw@alpinegeophysics.com">jgw@alpinegeophysics.com</a>><o:p></o:p></p>
<div>
<div>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>Folks,</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>I am having a
problem determining the best way to clip out and disgrad a set of
linestrings. Here is my setup:</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>itn=# select
postgis_full_version();</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>
postgis_full_version
</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>------------------------------------------------------------------------------------------------------------------</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> POSTGIS="1.3.2"
GEOS="3.0.0-CAPI-1.4.1" PROJ="Rel. 4.4.9, 29 Oct 2004"
USE_STATS (procs from 1.1.2 need upgrade)</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>(1 row)</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>itn=# select
version();</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>
version
</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>----------------------------------------------------------------------------------------------------------</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> PostgreSQL
8.1.3 on x86_64-unknown-linux-gnu, compiled by GCC gcc (GCC) 4.0.0 20050519
(Red Hat 4.0.0-8)</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>(1 row)</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>My linestring
network has the following attributes (and a picture for visualization):</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>itn=# \d
itn.scaglinks</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>
Table
"itn.links"</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>
Column
| Type
|
Modifiers
</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>------------------------+------------------+-------------------------------------------------------------------------</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> record_id_alternate
| integer | not null
default nextval('itn.scaglinks_record_id_alternate_seq3'::regclass)</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> a_node
| integer | </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> b_node
| integer | </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> dist
| integer | </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> taz_id
| integer | </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> .<clip></span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> .</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> .<clip></span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> the_geom
| geometry | </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>Indexes:</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>
"idx_scaglinks_00" btree (a_node)</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>
"idx_scaglinks_01" btree (b_node)</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>
"idx_scaglinks_02" btree (a_node, b_node)</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>
"idx_scaglinks_03" btree (link_id)</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>
"pkgis_scaglinks" gist (the_geom)</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>Check constraints:</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>
"enforce_dims_the_geom" CHECK (ndims(the_geom) = 2)</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>
"enforce_geotype_the_geom" CHECK (geometrytype(the_geom) =
'MULTILINESTRING'::text OR the_geom IS NULL)</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>
"enforce_srid_the_geom" CHECK (srid(the_geom) = 26911)</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'><img border=0
width=588 height=362 id="_x0000_i1025" src="cid:image001.png@01CA41FF.AF3914A0"
alt=scaglinks.GIF></span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>My clipping polygon
has the following attributes (and a picture for visualization):</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>itn=# \d
itn.itn_clip_polygon_1</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> Table
"itn.itn_clip_polygon_1"</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> Column
| Type | Modifiers </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>----------+----------+-----------</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> cyid
| integer | </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> the_geom |
geometry | </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>Indexes:</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>
"pkgis_itn_clip_polygon_1" gist (the_geom)</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'><img border=0
width=578 height=357 id="_x0000_i1026" src="cid:image002.png@01CA41FF.AF3914A0"
alt="scaglinks_clip_polygon.GIF"></span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>When I run the
following command to clip the scaglinks linestrings, the </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>results are what I
would expect (again, a picture for visualization):</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>itn=# create table
clipped as select intersection(a.the_geom,b.the_geom) as </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>new_geom,
length(a.the_geom) as original_link_length, a.* from scaglinks a, </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>itn_clip_polygon_1
b where intersects(a.the_geom,b.the_geom);</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>SELECT</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>itn=# create index
pkgis_clipped on clipped using gist(new_geom);</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>CREATE INDEX</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>itn=# \d
itn.clipped</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>
Table "itn.clipped"</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>
Column
| Type
| Modifiers </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>------------------------+------------------+-----------</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> new_geom
| geometry | </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> original_link_length
| double precision | </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> record_id_alternate
| integer | </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> a_node
| integer | </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> b_node
| integer | </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> dist
| integer | </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> taz_id
| integer | </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> .<clip></span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> .</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> .<clip></span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> the_geom
| geometry | </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>Indexes:</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>
"pkgis_clipped" gist (new_geom)</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'><img border=0
width=539 height=331 id="_x0000_i1027" src="cid:image003.png@01CA41FF.AF3914A0"
alt="scaglinks_clipped.GIF"></span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>What I am really
after are the links that fall outside the clipping</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>polygon. So I
attempted the following query:</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>itn=# create table
clipped2 as SELECT a.*, difference(a.the_geom,b.new_geom) as new_geom from
scaglinks a, clipped b;</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>******** after 12
hours, the query throws the following error ********</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>ERROR: could not
extend relation 1663/164540/180960: No space left on device</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>HINT: Check free
disk space</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>The scaglinks
network consists of 108,000 links and the clipped network</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>consists of 6,200
links. I have approximately 1.5 TB of free disk so I</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>do not believe that
disk space should be a problem.</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>Again, what I had
hoped is that the query to create clipped2 would return</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>a table that
results in the following graphic:</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'><img border=0
width=560 height=346 id="_x0000_i1028" src="cid:image004.png@01CA41FF.AF3914A0"
alt="but_want_this.GIF"></span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>*****************</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>Can you offer any
help in the query that will result in a table that</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>looks something
like the last graphic?</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>Best Regards,</span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'> </span><o:p></o:p></p>
<p><span style='font-size:10.0pt;font-family:"Courier New"'>Jim</span><o:p></o:p></p>
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