<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:10pt">Thanks for all the replies.<br><br>My Wind turbine table will only have around 300 - maximum 500 points. The photos shouldn´t change until either a turbine vanishes or gets repowered (ie. upgraded).<br><br>I am pretty new to postgis so when you all start talking about TOAST I start thinking about food rather than data formats. TOAST, Large blob, OID...how do I decide? As the images will be (hopefully) displayed over the web and they shouldn´t be more than 50 kb each. They are simply there to display a nice picture when someonw clicks on the map. <br><br>The table will however be updated with new turbines and we will certainly find errors so that some will have to be deleted or moved.<br><br>Would it be easier to keep them all in one table rather than in separate
tables?<br><br>yours,<br><br>Rob<br><div><br></div><div style="font-family: times new roman,new york,times,serif; font-size: 10pt;"><br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font face="Tahoma" size="2"><hr size="1"><b><span style="font-weight: bold;">Von:</span></b> Paragon Corporation <lr@pcorp.us><br><b><span style="font-weight: bold;">An:</span></b> PostGIS Users Discussion <postgis-users@postgis.refractions.net><br><b><span style="font-weight: bold;">Gesendet:</span></b> Dienstag, den 8. März 2011, 6:00:00 Uhr<br><b><span style="font-weight: bold;">Betreff:</span></b> Re: [postgis-users] images in postgresql<br></font><br>
<base>
<div dir="ltr" align="left"><span class="953075204-08032011"><font color="#0000ff" face="Arial" size="2">Ben,</font></span></div>
<div dir="ltr" align="left"><span class="953075204-08032011"><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><span class="953075204-08032011"><font color="#0000ff" face="Arial" size="2">My understanding is the same (as long as you don't select the
column that is) otherwise has to be detoasted. As I recall, I think a small bit
will be stored and then the rest that doesn't fit into (I can't recall maximum
space), gets chunked into toast records.</font></span></div>
<div dir="ltr" align="left"><span class="953075204-08032011"><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><span class="953075204-08032011"><font color="#0000ff" face="Arial" size="2">Its true for most of the databases I've worked with - e.g.
large text or blobs just the pointer is stored in the main table, except
PostgreSQL makes this decision conditionally on size and other databases make it
beforehand based on data type.</font></span></div>
<div dir="ltr" align="left"><span class="953075204-08032011"><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><span class="953075204-08032011"><font color="#0000ff" face="Arial" size="2">However -- UPDATES will be painful I think because even though
the data is toasted, PostgreSQL will still create an MVCC copy of the
whole record when doing updates and slushing around big pictures and
geometries can be painful. So if your other wind turbine info gets changed
more often than the photos, I would keep them separate.</font></span></div>
<div dir="ltr" align="left"><span class="953075204-08032011"><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><span class="953075204-08032011"><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div dir="ltr" align="left"><span class="953075204-08032011"><font color="#0000ff" face="Arial" size="2">Leo</font></span></div>
<div dir="ltr" align="left"><span class="953075204-08032011"><font color="#0000ff" face="Arial" size="2"><a rel="nofollow" target="_blank" href="http://www.postgis.us">http://www.postgis.us</a></font></span></div>
<div dir="ltr" align="left"><span class="953075204-08032011"><font color="#0000ff" face="Arial" size="2"></font></span> </div><br>
<div dir="ltr" class="OutlookMessageHeader" align="left" lang="en-us">
<hr tabindex="-1">
<font face="Tahoma" size="2"><b>From:</b>
postgis-users-bounces@postgis.refractions.net
[mailto:postgis-users-bounces@postgis.refractions.net] <b>On Behalf Of </b>Ben
Madin<br><b>Sent:</b> Monday, March 07, 2011 8:31 PM<br><b>To:</b> PostGIS Users
Discussion<br><b>Subject:</b> Re: [postgis-users] images in
postgresql<br></font><br></div>
<div></div>Robert,
<div><br>
<div>
<div>On 06/03/2011, at 4:28 PM, Robert Buckley wrote:</div><br class="Apple-interchange-newline">
<blockquote type="cite"><span style="widows: 2; text-transform: none; text-indent: 0px; border-collapse: separate; font: medium Helvetica; white-space: normal; orphans: 2; letter-spacing: normal; word-spacing: 0px;" class="Apple-style-span">
<div>
<div style="margin: 0px; font-family: times,serif; font-size: 10pt;">The
windturbine table exists in EPSG:4326. I made a seperate table for the images
because I didn´t wan´t to blow the size of the wind turbine table out of
proportion and jeopardize performance.<br></div></div></span></blockquote>
<div><br></div>
<div>My understanding - and if I'm wrong I need to know(!) - is that the sort of
data you are talking about (large geometries or blobs - for your pictures) are
not stored in the primary table, but in associated storage space, known as TOAST
tables. </div>
<div><br></div>
<div>This has important implications for indexing, but is brilliant because the
content of these data fields does not directly impact on the number of pages
that the table takes, hence rapid searching is still possible.</div>
<div><br></div>
<div>cheers</div>
<div><br></div>
<div>Ben</div>
<div><br></div>
<div><br></div>
<div><br></div><br>
<blockquote type="cite"><span style="widows: 2; text-transform: none; text-indent: 0px; border-collapse: separate; font: medium Helvetica; white-space: normal; orphans: 2; letter-spacing: normal; word-spacing: 0px;" class="Apple-style-span">
<div>
<div style="margin: 0px; font-family: times,serif; font-size: 10pt;"><br>I
am making a simple application to show wind turbines as wms and I wanted to
show the turbine in a popup. I´m not sure how to get the popup to display
though.<br><br>Any examples?<br>Thanks,<br><br>Rob<br>
<div style="margin: 0px;"><br></div>
<div style="margin: 0px; font-family: times,serif; font-size: 10pt;"><br>
<div style="margin: 0px; font-family: times,serif; font-size: 12pt;"><font face="Tahoma" size="2">
<hr size="1">
<b><span style="font-weight: bold;">Von:</span></b><span class="Apple-converted-space"> </span>Paragon Corporation <<a rel="nofollow" ymailto="mailto:lr@pcorp.us" target="_blank" href="mailto:lr@pcorp.us">lr@pcorp.us</a>><br><b><span style="font-weight: bold;">An:</span></b><span class="Apple-converted-space"> </span>PostGIS Users Discussion <<a rel="nofollow" ymailto="mailto:postgis-users@postgis.refractions.net" target="_blank" href="mailto:postgis-users@postgis.refractions.net">postgis-users@postgis.refractions.net</a>><br><b><span style="font-weight: bold;">Gesendet:</span></b><span class="Apple-converted-space"> </span>Samstag, den 5. März 2011, 18:21:49
Uhr<br><b><span style="font-weight: bold;">Betreff:</span></b><span class="Apple-converted-space"> </span>Re: [postgis-users] images in
postgresql<br></font><br>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2">Robert,</font></span></div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2">Is there a
reason why you have the points in a separate table or do you have points in
both tables and you want to relate by a spatial join?</font></span></div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2"> If its a
1 to 1 relationship, we would just put them in the same
table.</font></span></div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2">As far as
foreign keys go, you should have some identifier the same in the two
tables. Do you? </font></span></div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2">So it would be
of the form</font></span></div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2">SELECT
wt.wt_id, wt.geom, p.picture</font></span></div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2">FROM
windturbines As wt INNER JOIN pictures As p ON wt.wt_id =
p.wt_id</font></span></div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2">or if they are
spatially related by space</font></span></div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2"></font></span> </div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2"></font>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2"><font color="#0000ff" face="Arial" size="2">SELECT wt.wt_id, wt.geom,
p.picture</font></font></span></div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2"><font color="#0000ff" face="Arial" size="2">FROM windturbines As wt INNER JOIN pictures As
p ON ST_DWithin(wt.geom, pt.geom, 10)</font></font></span></div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"></span><font color="#0000ff" face="Arial" size="2"></font> </div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"></span><font color="#0000ff" face="Arial" size="2"></font> </div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2">The 10 depends
on the spatial reference system or if you are using geography type then it
means 10 meters. So I'm treating the wind turbine location and picture
location as the same if they are within 10 meters apart.</font></span></div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"></span><font color="#0000ff" face="Arial" size="2"></font> </div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2">BTW: you might
want to read the first chapter of our upcoming book. It's a free
download and answers this type of question with concrete
examples.</font></span></div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2"><a rel="nofollow" target="_blank" href="http://www.postgis.us/chapter_01">http://www.postgis.us/chapter_01</a></font></span></div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"></span><font color="#0000ff" face="Arial" size="2"></font> </div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2">Leo</font></span></div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2"><a rel="nofollow" target="_blank" href="http://www.postgis.us">http://www.postgis.us</a></font></span></div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"></span><font color="#0000ff" face="Arial" size="2"></font> </div></span></div>
<div style="margin: 0px;" dir="ltr" align="left"><span class="208011417-05032011"><font color="#0000ff" face="Arial" size="2"></font></span> </div><br>
<div style="margin: 0px;" dir="ltr" class="OutlookMessageHeader" align="left" lang="en-us">
<hr tabindex="-1">
<font face="Tahoma" size="2"><b>From:</b><span class="Apple-converted-space"> </span><a rel="nofollow" ymailto="mailto:postgis-users-bounces@postgis.refractions.net" target="_blank" href="mailto:postgis-users-bounces@postgis.refractions.net">postgis-users-bounces@postgis.refractions.net</a><span class="Apple-converted-space"> </span>[mailto:postgis-users-bounces@postgis.refractions.net]<span class="Apple-converted-space"> </span><b>On Behalf Of<span class="Apple-converted-space"> </span></b>Robert
Buckley<br><b>Sent:</b><span class="Apple-converted-space"> </span>Saturday, March 05, 2011 5:39
AM<br><b>To:</b><span class="Apple-converted-space"> </span><a rel="nofollow" ymailto="mailto:postgis-users@postgis.refractions.net" target="_blank" href="mailto:postgis-users@postgis.refractions.net">postgis-users@postgis.refractions.net</a><br><b>Subject:</b><span class="Apple-converted-space"> </span>[postgis-users] images in
postgresql<br></font><br></div>
<div style="margin: 0px;"></div>
<div style="margin: 0px; font-family: times,serif; color: rgb(64, 0, 127); font-size: 10pt;">Hi,<br><br>I
am just experimenting at the moment with a project and could do with some
advice.<br><br>I have created a database which contains photos of
Windturbines. I also have a postgis database with the locations (points)
of the wind turbines and would like join the photos to the points via a link
table or foreign key.<br><br>As you can tell, I haven´t too much experience
with postgresql and relational database design. But i can imagine that the
task should not be too difficult.<br><br>I am just a bit unsure how to go
about it. The photos are on the linux server and the creation of the table and
the insert of the image was successfull. But how do i get the join and
how would I display this photo in a geoext project?<br><br>thanks for any
tips,<br><br>Robert<br><br>
<div style="margin: 0px;"><br></div></div><br></div></div></div><br>_______________________________________________<br>postgis-users
mailing list<br><a rel="nofollow" ymailto="mailto:postgis-users@postgis.refractions.net" target="_blank" href="mailto:postgis-users@postgis.refractions.net">postgis-users@postgis.refractions.net</a><br><a rel="nofollow" target="_blank" href="http://postgis.refractions.net/mailman/listinfo/postgis-users">http://postgis.refractions.net/mailman/listinfo/postgis-users</a><br></div></span></blockquote></div><br></div></div></div>
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