<a href="http://www.spatialreference.org">www.spatialreference.org</a><br><br>(será actualizado ?)<br><br>Fred.<br><br><br><br><br><div class="gmail_quote">On Tue, Jun 15, 2010 at 2:29 PM, Miguel Marques <span dir="ltr"><<a href="http://miguelmarques.mm">miguelmarques.mm</a>@<a href="http://gmail.com">gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div link="blue" vlink="purple" lang="PT">
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<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);">Boa tarde,</span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);">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?</span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);">No <a href="http://www.igeo.pt/produtos/Geodesia/Inf_tecnica/sistemas_referencia/sistemas_referencia.htm" target="_blank">site
do IGP</a> encontrei a referência e descrição dos sistemas de coordenadas, mas
não o código EPSG. </span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);">Encontrei também <a href="http://geodivagar.blogspot.com/2009/11/codigos-epsg-utilizados-em-portugal.html" target="_blank">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.</span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);">Se alguém puder confirmar ou corrigir, agradeço.</span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);">Miguel Marques</span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 10pt; color: rgb(31, 73, 125);"> </span></p>
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<p class="MsoNormal"><b><span style="font-size: 10pt;">De:</span></b><span style="font-size: 10pt;">
<a href="mailto:portugal-bounces@lists.osgeo.org" target="_blank">portugal-bounces@lists.osgeo.org</a> [mailto:<a href="mailto:portugal-bounces@lists.osgeo.org" target="_blank">portugal-bounces@lists.osgeo.org</a>] <b>Em
nome de </b>Artur Gil<br>
<b>Enviada:</b> segunda-feira, 14 de Junho de 2010 23:11<br>
<b>Para:</b> <a href="mailto:lusogis@yahoogroups.com" target="_blank">lusogis@yahoogroups.com</a><br>
<b>Cc:</b> <a href="mailto:portugal@lists.osgeo.org" target="_blank">portugal@lists.osgeo.org</a><br>
<b>Assunto:</b> [Portugal] OpenGeo announced the launch of the <a href="http://prj2epsg.org" target="_blank">prj2epsg.org</a>
tool and website</span></p>
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<h3 style="margin: 0cm 0cm 0.0001pt;"><span style="font-size: 15pt; color: rgb(26, 44, 82);"><a href="http://blog.opengeo.org/2010/06/14/prj2epsg/" target="_blank">http://blog.opengeo.org/2010/06/14/prj2epsg/</a></span></h3>
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<p class="MsoNormal" style="line-height: 15.75pt;"><span style="font-size: 10pt; color: rgb(35, 29, 23);"> </span></p>
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<h3 style="margin: 0cm 0cm 0.0001pt; outline-style: none;"><span style="font-size: 15pt; color: rgb(26, 44, 82);">Prj2EPSG</span></h3>
<div style="margin-bottom: 15pt; outline-style: none;">
<p class="MsoNormal" style="line-height: 15.75pt;"><span style="font-size: 9pt; color: rgb(67, 92, 0);">June 14th, 2010</span></p>
</div>
<div style="margin-bottom: 24pt; outline-style: none;">
<p style="margin: 0cm 0cm 0.0001pt; line-height: 18pt;"><span style="font-size: 9pt; color: rgb(35, 29, 23);">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" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; padding: 0cm;">Web Map Service</span></a>”
specification, if you will.</span></p>
<p style="margin: 0cm 0cm 0.0001pt; line-height: 18pt; outline-style: none;"><span style="font-size: 9pt; color: rgb(35, 29, 23);">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" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; padding: 0cm;">projections</span></a>, and in order
to overlay one map onto another, they needed to know (and advertise) the
projections of both.</span></p>
<p style="margin: 0cm 0cm 0.0001pt; line-height: 18pt; outline-style: none;"><span style="font-size: 9pt; color: rgb(35, 29, 23);">There was an existing
standard for representing map projections, called “<a href="http://en.wikipedia.org/wiki/Well-known_text#Spatial_reference_systems" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; 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:</span></p>
<pre style="margin-bottom: 19.2pt; line-height: 18pt; outline-style: none;"><span style="font-size: 8.5pt; color: rgb(204, 51, 51);">GEOGCS["WGS 84",</span></pre><pre style="margin-bottom: 19.2pt; line-height: 18pt;">
<span style="font-size: 8.5pt; color: rgb(204, 51, 51);"> DATUM["WGS_1984",</span></pre><pre style="margin-bottom: 19.2pt; line-height: 18pt;"><span style="font-size: 8.5pt; color: rgb(204, 51, 51);"> SPHEROID["WGS 84",6378137,298.257223563,</span></pre>
<pre style="margin-bottom: 19.2pt; line-height: 18pt;"><span style="font-size: 8.5pt; color: rgb(204, 51, 51);"> AUTHORITY["EPSG","7030"]],</span></pre><pre style="margin-bottom: 19.2pt; line-height: 18pt;">
<span style="font-size: 8.5pt; color: rgb(204, 51, 51);"> AUTHORITY["EPSG","6326"]],</span></pre><pre style="margin-bottom: 19.2pt; line-height: 18pt;"><span style="font-size: 8.5pt; color: rgb(204, 51, 51);"> PRIMEM["Greenwich",0,</span></pre>
<pre style="margin-bottom: 19.2pt; line-height: 18pt;"><span style="font-size: 8.5pt; color: rgb(204, 51, 51);"> AUTHORITY["EPSG","8901"]],</span></pre><pre style="margin-bottom: 19.2pt; line-height: 18pt;">
<span style="font-size: 8.5pt; color: rgb(204, 51, 51);"> UNIT["degree",0.01745329251994328,</span></pre><pre style="margin-bottom: 19.2pt; line-height: 18pt;"><span style="font-size: 8.5pt; color: rgb(204, 51, 51);"> AUTHORITY["EPSG","9122"]],</span></pre>
<pre style="margin-bottom: 19.2pt; line-height: 18pt;"><span style="font-size: 8.5pt; color: rgb(204, 51, 51);"> AUTHORITY["EPSG","4326"]]</span></pre>
<p style="margin-right: 0cm; margin-bottom: 24pt; margin-left: 0cm; line-height: 18pt; outline-style: none;"><span style="font-size: 9pt; color: rgb(35, 29, 23);">More importantly, how would this fit cleanly into a URL?</span></p>
<p style="margin: 0cm 0cm 0.0001pt; line-height: 18pt; outline-style: none;"><span style="font-size: 9pt; color: rgb(35, 29, 23);">Fortunately, there already
existed a large database of commonly used map projections: the <a href="http://www.epsg.org/CurrentDB.html" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; 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.</span></p>
<p style="margin: 0cm 0cm 0.0001pt; line-height: 18pt; outline-style: none;"><span style="font-size: 9pt; color: rgb(35, 29, 23);">But, unlike me, most GIS
practitioners haven’t memorized the EPSG database. So they frequently ask
questions like <i><span>“what
is the EPSG number for Oregon State-Plane South?”</span></i> and <i><span>“how do I find the EPSG number for
this shapefile?”</span></i> One could search <a href="http://spatialreference.org/" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; 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:</span></p>
<pre style="margin-bottom: 19.2pt; line-height: 18pt; outline-style: none;"><span style="font-size: 8.5pt; color: rgb(204, 51, 51);">SELECT srid, srtext FROM spatial_ref_sys WHERE srtext ILIKE '%oregon%';</span></pre>
<p style="margin: 0cm 0cm 0.0001pt; line-height: 18pt; outline-style: none;"><span style="font-size: 9pt; color: rgb(35, 29, 23);">But today, I can provide a
much simpler answer: <b><span>Use <a href="http://prj2epsg.org/search" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; padding: 0cm;">prj2epsg.org</span></a></span></b>. With <b><span><a href="http://prj2epsg.org/search" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; padding: 0cm;">prj2epsg.org</span></a></span></b>, you can paste in <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" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; padding: 0cm;">full well-known
text descriptions</span></a>, you can type in <a href="http://prj2epsg.org/search?terms=bc+albers" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; padding: 0cm;">shorter keyword searches</span></a>,
and you can even read a .prj file directly.</span></p>
<p style="margin: 0cm 0cm 0.0001pt; line-height: 18pt; outline-style: none;"><span style="font-size: 9pt; color: rgb(35, 29, 23);">This free public service is
provided by <a href="http://opengeo.org/" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; padding: 0cm;">OpenGeo</span></a> and our cloud
services provider <a href="http://www.skygoneinc.com/" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; padding: 0cm;">SkyGone</span></a>.
The code is naturally all <a href="http://svn.opengeo.org/prj2epsg/trunk/" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; padding: 0cm;">open source</span></a> and
the service is built on top of the same GeoTools library that is at the
heart of our<a href="http://opengeo.org/products/suite" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; padding: 0cm;">OpenGeo Suite</span></a>.</span></p>
<p style="margin-right: 0cm; margin-bottom: 24pt; margin-left: 0cm; line-height: 18pt; outline-style: none;"><span style="font-size: 9pt; color: rgb(35, 29, 23);">And now we’re all hopefully one step closer to living happily
ever after.</span></p>
<p style="margin: 0cm 0cm 0.0001pt; line-height: 18pt; outline-style: none;"><span style="font-size: 9pt; color: rgb(35, 29, 23);">Tags: <a href="http://blog.opengeo.org/tag/epsg/" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; padding: 0cm;">epsg</span></a>, <a href="http://blog.opengeo.org/tag/prj/" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; padding: 0cm;">prj</span></a>, <a href="http://blog.opengeo.org/tag/shapefile/" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; padding: 0cm;">shapefile</span></a>, <a href="http://blog.opengeo.org/tag/site/" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; padding: 0cm;">site</span></a>, <a href="http://blog.opengeo.org/tag/well-known-text/" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; padding: 0cm;">well known text</span></a>, <a href="http://blog.opengeo.org/tag/wkt/" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; padding: 0cm;">wkt</span></a></span></p>
<div style="border-width: medium medium 1pt; border-style: none none solid; border-color: -moz-use-text-color -moz-use-text-color rgb(168, 188, 207); padding: 0cm 0cm 12pt; outline-style: none; background-repeat: repeat;">
<p class="MsoNormal" style="line-height: 18pt; background: none repeat scroll 0% 0% rgb(240, 245, 239);"><span style="font-size: 8pt; color: rgb(35, 29, 23);">This
entry was written <span>by <a><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; padding: 0cm;">Paul Ramsey</span></a></span> on
Monday, June 14th, 2010 at 10:00 am and is filed under <a href="http://blog.opengeo.org/category/products/" title="View all posts in Products" target="_blank"><span style="color: rgb(51, 102, 204); border: 1pt none windowtext; padding: 0cm;">Products</span></a>. You can follow any responses to this entry
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