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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>Boa tarde,<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>Aproveitando o tópico de sistemas EPSG, há algum local que tenha
a lista actualizada dos códigos EPSG para os sistemas de coordenadas Portugueses,
activos e obsoletos?<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>No <a
href="http://www.igeo.pt/produtos/Geodesia/Inf_tecnica/sistemas_referencia/sistemas_referencia.htm">site
do IGP</a> encontrei a referência e descrição dos sistemas de coordenadas, mas
não o código EPSG. <o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>Encontrei também <a
href="http://geodivagar.blogspot.com/2009/11/codigos-epsg-utilizados-em-portugal.html">um
post no blog Geo-divagações</a> com um resumo de Novembro do ano passado, mas
que colide com uns e-mails trocados nesta lista sobre os códigos EPSG há uns
meses atrás, sobre os Açores.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>Se alguém puder confirmar ou corrigir, agradeço.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>Miguel Marques<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>De:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
portugal-bounces@lists.osgeo.org [mailto:portugal-bounces@lists.osgeo.org] <b>Em
nome de </b>Artur Gil<br>
<b>Enviada:</b> segunda-feira, 14 de Junho de 2010 23:11<br>
<b>Para:</b> lusogis@yahoogroups.com<br>
<b>Cc:</b> portugal@lists.osgeo.org<br>
<b>Assunto:</b> [Portugal] OpenGeo announced the launch of the prj2epsg.org
tool and website<o:p></o:p></span></p>

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</div>

<p class=MsoNormal><o:p>&nbsp;</o:p></p>

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<div>

<h3 style='margin:0cm;margin-bottom:.0001pt;mso-line-height-alt:14.4pt'><span
style='font-size:15.0pt;font-family:"Helvetica","sans-serif";color:#1A2C52'><a
href="http://blog.opengeo.org/2010/06/14/prj2epsg/">http://blog.opengeo.org/2010/06/14/prj2epsg/</a><o:p></o:p></span></h3>

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<p class=MsoNormal style='line-height:15.75pt'><span style='font-size:10.0pt;
font-family:"Helvetica","sans-serif";color:#231D17'><o:p>&nbsp;</o:p></span></p>

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<h3 style='margin:0cm;margin-bottom:.0001pt;mso-line-height-alt:14.4pt;
outline-style: none;outline-width: initial;outline-color: initial'><span
style='font-size:15.0pt;font-family:"Helvetica","sans-serif";color:#1A2C52'>Prj2EPSG<o:p></o:p></span></h3>

<div style='margin-bottom:15.0pt;outline-style: none;outline-width: initial;
outline-color: initial'>

<p class=MsoNormal style='line-height:15.75pt'><span style='font-size:9.0pt;
font-family:"Helvetica","sans-serif";color:#435C00'>June 14th, 2010<o:p></o:p></span></p>

</div>

<div style='margin-bottom:24.0pt;outline-style: none;outline-width: initial;
outline-color: initial'>

<p style='margin:0cm;margin-bottom:.0001pt;line-height:18.0pt'><span
style='font-size:9.0pt;font-family:"Helvetica","sans-serif";color:#231D17'>Once
upon a time, a group of smart people got together to define a common standards
base for geographic map services, a “<a
href="http://www.opengeospatial.org/standards/wms"><span style='color:#3366CC;
border:none windowtext 1.0pt;padding:0cm'>Web Map Service</span></a>”
specification, if you will.<o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;line-height:18.0pt;outline-style: none;
outline-width: initial;outline-color: initial'><span style='font-size:9.0pt;
font-family:"Helvetica","sans-serif";color:#231D17'>They wanted their map
services to be interoperable, but different maps can be rendered using different<a
href="http://en.wikipedia.org/wiki/Map_projection"><span style='color:#3366CC;
border:none windowtext 1.0pt;padding:0cm'>projections</span></a>, and in order
to overlay one map onto another, they needed to know (and advertise) the
projections of both.<o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;line-height:18.0pt;outline-style: none;
outline-width: initial;outline-color: initial'><span style='font-size:9.0pt;
font-family:"Helvetica","sans-serif";color:#231D17'>There was an existing
standard for representing map projections, called “<a
href="http://en.wikipedia.org/wiki/Well-known_text#Spatial_reference_systems"><span
style='color:#3366CC;border:none windowtext 1.0pt;padding:0cm'>well-known text</span></a>”
(which is also, confusingly, the name that describes a standard for
representing geometries) but it was quite verbose. Who, after all, could
remember this:<o:p></o:p></span></p>

<pre style='margin-bottom:19.2pt;line-height:18.0pt;outline-style: none;
outline-width: initial;outline-color: initial'><span style='font-size:8.5pt;
font-family:"Helvetica","sans-serif";color:#CC3333'>GEOGCS[&quot;WGS 84&quot;,<o:p></o:p></span></pre><pre
style='margin-bottom:19.2pt;line-height:18.0pt'><span style='font-size:8.5pt;
font-family:"Helvetica","sans-serif";color:#CC3333'>    DATUM[&quot;WGS_1984&quot;,<o:p></o:p></span></pre><pre
style='margin-bottom:19.2pt;line-height:18.0pt'><span style='font-size:8.5pt;
font-family:"Helvetica","sans-serif";color:#CC3333'>        SPHEROID[&quot;WGS 84&quot;,6378137,298.257223563,<o:p></o:p></span></pre><pre
style='margin-bottom:19.2pt;line-height:18.0pt'><span style='font-size:8.5pt;
font-family:"Helvetica","sans-serif";color:#CC3333'>            AUTHORITY[&quot;EPSG&quot;,&quot;7030&quot;]],<o:p></o:p></span></pre><pre
style='margin-bottom:19.2pt;line-height:18.0pt'><span style='font-size:8.5pt;
font-family:"Helvetica","sans-serif";color:#CC3333'>        AUTHORITY[&quot;EPSG&quot;,&quot;6326&quot;]],<o:p></o:p></span></pre><pre
style='margin-bottom:19.2pt;line-height:18.0pt'><span style='font-size:8.5pt;
font-family:"Helvetica","sans-serif";color:#CC3333'>    PRIMEM[&quot;Greenwich&quot;,0,<o:p></o:p></span></pre><pre
style='margin-bottom:19.2pt;line-height:18.0pt'><span style='font-size:8.5pt;
font-family:"Helvetica","sans-serif";color:#CC3333'>        AUTHORITY[&quot;EPSG&quot;,&quot;8901&quot;]],<o:p></o:p></span></pre><pre
style='margin-bottom:19.2pt;line-height:18.0pt'><span style='font-size:8.5pt;
font-family:"Helvetica","sans-serif";color:#CC3333'>    UNIT[&quot;degree&quot;,0.01745329251994328,<o:p></o:p></span></pre><pre
style='margin-bottom:19.2pt;line-height:18.0pt'><span style='font-size:8.5pt;
font-family:"Helvetica","sans-serif";color:#CC3333'>        AUTHORITY[&quot;EPSG&quot;,&quot;9122&quot;]],<o:p></o:p></span></pre><pre
style='margin-bottom:19.2pt;line-height:18.0pt'><span style='font-size:8.5pt;
font-family:"Helvetica","sans-serif";color:#CC3333'>    AUTHORITY[&quot;EPSG&quot;,&quot;4326&quot;]]<o:p></o:p></span></pre>

<p style='mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:24.0pt;
margin-left:0cm;line-height:18.0pt;outline-style: none;outline-width: initial;
outline-color: initial'><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";
color:#231D17'>More importantly, how would this fit cleanly into a URL?<o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;line-height:18.0pt;outline-style: none;
outline-width: initial;outline-color: initial'><span style='font-size:9.0pt;
font-family:"Helvetica","sans-serif";color:#231D17'>Fortunately, there already
existed a large database of commonly used map projections: the&nbsp;<a
href="http://www.epsg.org/CurrentDB.html"><span style='color:#3366CC;
border:none windowtext 1.0pt;padding:0cm'>EPSG database</span></a>. This
provided a single numeric ID for each common map projection. So it was decided
that all map services must advertise their projection using a unique number
defined by an authority, and set EPSG as the first authority. And so ESPG:4326
came into the world (WGS84 geographic coordinates) along with ESPG:26910 (NAD83
UTM Zone 10 North), and many others.<o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;line-height:18.0pt;outline-style: none;
outline-width: initial;outline-color: initial'><span style='font-size:9.0pt;
font-family:"Helvetica","sans-serif";color:#231D17'>But, unlike me, most GIS
practitioners haven’t memorized the EPSG database. So they frequently ask
questions like&nbsp;<em><span style='font-family:"Helvetica","sans-serif"'>“what
is the EPSG number for Oregon State-Plane South?”</span></em>&nbsp;and&nbsp;<em><span
style='font-family:"Helvetica","sans-serif"'>“how do I find the EPSG number for
this shapefile?”</span></em>&nbsp;One could search&nbsp;<a
href="http://spatialreference.org/"><span style='color:#3366CC;border:none windowtext 1.0pt;
padding:0cm'>spatialreference.org</span></a>, a site for understanding spatial
reference systems. My own answer used to be a fairly unhelpful set of
directions for doing a text search of the PostGIS SPATIAL_REF_SYS table:<o:p></o:p></span></p>

<pre style='margin-bottom:19.2pt;line-height:18.0pt;outline-style: none;
outline-width: initial;outline-color: initial'><span style='font-size:8.5pt;
font-family:"Helvetica","sans-serif";color:#CC3333'>SELECT srid, srtext FROM spatial_ref_sys WHERE srtext ILIKE '%oregon%';<o:p></o:p></span></pre>

<p style='margin:0cm;margin-bottom:.0001pt;line-height:18.0pt;outline-style: none;
outline-width: initial;outline-color: initial'><span style='font-size:9.0pt;
font-family:"Helvetica","sans-serif";color:#231D17'>But today, I can provide a
much simpler answer:&nbsp;<strong><span style='font-family:"Helvetica","sans-serif"'>Use&nbsp;<a
href="http://prj2epsg.org/search"><span style='color:#3366CC;border:none windowtext 1.0pt;
padding:0cm'>prj2epsg.org</span></a></span></strong>. With&nbsp;<strong><span
style='font-family:"Helvetica","sans-serif"'><a
href="http://prj2epsg.org/search"><span style='color:#3366CC;border:none windowtext 1.0pt;
padding:0cm'>prj2epsg.org</span></a></span></strong>, you can paste in&nbsp;<a
href="http://prj2epsg.org/search?terms=PROJCS%5B%22NAD_1983_StatePlane_Oregon_South_FIPS_3602_Feet_Intl%22%2CGEOGCS%5B%22GCS_North_American_1983%22%2CDATUM%5B%22D_North_American_1983%22%2CSPHEROID%5B%22GRS_1980%22%2C6378137.0%2C298.257222101%5D%5D%2CPRIMEM%5B%22Greenwich%22%2C0.0%5D%2CUNIT%5B%22Degree%22%2C0.0174532925199433%5D%5D%2CPROJECTION%5B%22Lambert_Conformal_Conic%22%5D%2CPARAMETER%5B%22False_Easting%22%2C4921259.842519685%5D%2CPARAMETER%5B%22False_Northing%22%2C0.0%5D%2CPARAMETER%5B%22Central_Meridian%22%2C-120.5%5D%2CPARAMETER%5B%22Standard_Parallel_1%22%2C42.33333333333334%5D%2CPARAMETER%5B%22Standard_Parallel_2%22%2C44.0%5D%2CPARAMETER%5B%22Latitude_Of_Origin%22%2C41.66666666666666%5D%2CUNIT%5B%22Foot%22%2C0.3048%5D%5D"><span
style='color:#3366CC;border:none windowtext 1.0pt;padding:0cm'>full well-known
text descriptions</span></a>, you can type in&nbsp;<a
href="http://prj2epsg.org/search?terms=bc+albers"><span style='color:#3366CC;
border:none windowtext 1.0pt;padding:0cm'>shorter keyword searches</span></a>,
and you can even read a .prj file directly.<o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;line-height:18.0pt;outline-style: none;
outline-width: initial;outline-color: initial'><span style='font-size:9.0pt;
font-family:"Helvetica","sans-serif";color:#231D17'>This free public service is
provided by&nbsp;<a href="http://opengeo.org/"><span style='color:#3366CC;
border:none windowtext 1.0pt;padding:0cm'>OpenGeo</span></a>&nbsp;and our cloud
services provider&nbsp;<a href="http://www.skygoneinc.com/"><span
style='color:#3366CC;border:none windowtext 1.0pt;padding:0cm'>SkyGone</span></a>.
The code is naturally all&nbsp;<a href="http://svn.opengeo.org/prj2epsg/trunk/"><span
style='color:#3366CC;border:none windowtext 1.0pt;padding:0cm'>open source</span></a>&nbsp;and
the service is built on top of the same&nbsp;GeoTools library that is at the
heart of our<a href="http://opengeo.org/products/suite"><span style='color:
#3366CC;border:none windowtext 1.0pt;padding:0cm'>OpenGeo Suite</span></a>.<o:p></o:p></span></p>

<p style='mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:24.0pt;
margin-left:0cm;line-height:18.0pt;outline-style: none;outline-width: initial;
outline-color: initial'><span style='font-size:9.0pt;font-family:"Helvetica","sans-serif";
color:#231D17'>And now we’re all hopefully one step closer to living happily
ever after.<o:p></o:p></span></p>

<p style='margin:0cm;margin-bottom:.0001pt;line-height:18.0pt;outline-style: none;
outline-width:
 initial;outline-color: initial'><span style='font-size:9.0pt;
font-family:"Helvetica","sans-serif";color:#231D17'>Tags:&nbsp;<a
href="http://blog.opengeo.org/tag/epsg/"><span style='color:#3366CC;border:
none windowtext 1.0pt;padding:0cm'>epsg</span></a>,&nbsp;<a
href="http://blog.opengeo.org/tag/prj/"><span style='color:#3366CC;border:none windowtext 1.0pt;
padding:0cm'>prj</span></a>,&nbsp;<a
href="http://blog.opengeo.org/tag/shapefile/"><span style='color:#3366CC;
border:none windowtext 1.0pt;padding:0cm'>shapefile</span></a>,&nbsp;<a
href="http://blog.opengeo.org/tag/site/"><span style='color:#3366CC;border:
none windowtext 1.0pt;padding:0cm'>site</span></a>,&nbsp;<a
href="http://blog.opengeo.org/tag/well-known-text/"><span style='color:#3366CC;
border:none windowtext 1.0pt;padding:0cm'>well known text</span></a>,&nbsp;<a
href="http://blog.opengeo.org/tag/wkt/"><span style='color:#3366CC;border:none windowtext 1.0pt;
padding:0cm'>wkt</span></a><o:p></o:p></span></p>

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<p class=MsoNormal style='line-height:18.0pt;background:#F0F5EF'><span
style='font-size:8.0pt;font-family:"Helvetica","sans-serif";color:#231D17'>This
entry was written&nbsp;<span class=author>by&nbsp;<a href="http://"><span
style='color:#3366CC;border:none windowtext 1.0pt;padding:0cm'>Paul Ramsey</span></a></span>&nbsp;on
Monday, June 14th, 2010 at 10:00 am and is filed under&nbsp;<a
href="http://blog.opengeo.org/category/products/"
title="View all posts in Products"><span style='color:#3366CC;border:none windowtext 1.0pt;
padding:0cm'>Products</span></a>. You can follow any responses to this entry
through the&nbsp;<a href="http://blog.opengeo.org/2010/06/14/prj2epsg/feed/"><span
style='color:#3366CC;border:none windowtext 1.0pt;padding:0cm'>RSS 2.0</span></a>&nbsp;feed.
You can&nbsp;<a href="http://blog.opengeo.org/2010/06/14/prj2epsg/#respond"><span
style='color:#3366CC;border:none windowtext 1.0pt;padding:0cm'>leave a response</span></a>,
or&nbsp;<a href="http://blog.opengeo.org/2010/06/14/prj2epsg/trackback/"><span
style='color:#3366CC;border:none windowtext 1.0pt;padding:0cm'>trackback</span></a>&nbsp;from
your own site.<o:p></o:p></span></p>

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