[Portugal] OpenGeo announced the launch of the prj2epsg.org tool and website

Tue Jun 15 09:38:21 EDT 2010

www.spatialreference.org

(será actualizado ?)

Fred.

On Tue, Jun 15, 2010 at 2:29 PM, Miguel Marques
<miguelmarques.mm at gmail.com>wrote:

>  Boa tarde,
>
>
>
> 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?
>
>
>
> No site do IGP<http://www.igeo.pt/produtos/Geodesia/Inf_tecnica/sistemas_referencia/sistemas_referencia.htm>encontrei a referência e descrição dos sistemas de coordenadas, mas não o
> código EPSG.
>
>
>
> Encontrei também um post no blog Geo-divagações<http://geodivagar.blogspot.com/2009/11/codigos-epsg-utilizados-em-portugal.html>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.
>
>
>
> Se alguém puder confirmar ou corrigir, agradeço.
>
>
>
> Miguel Marques
>
>
>
>
>
> *De:* portugal-bounces at lists.osgeo.org [mailto:
> portugal-bounces at lists.osgeo.org] *Em nome de *Artur Gil
> *Enviada:* segunda-feira, 14 de Junho de 2010 23:11
> *Para:* lusogis at yahoogroups.com
> *Cc:* portugal at lists.osgeo.org
> *Assunto:* [Portugal] OpenGeo announced the launch of the prj2epsg.orgtool and website
>
>
>  http://blog.opengeo.org/2010/06/14/prj2epsg/
>
>
>  Prj2EPSG
>
> June 14th, 2010
>
> Once upon a time, a group of smart people got together to define a common
> standards base for geographic map services, a “Web Map Service<http://www.opengeospatial.org/standards/wms>”
> specification, if you will.
>
> They wanted their map services to be interoperable, but different maps can
> be rendered using differentprojections<http://en.wikipedia.org/wiki/Map_projection>,
> and in order to overlay one map onto another, they needed to know (and
> advertise) the projections of both.
>
> There was an existing standard for representing map projections, called “well-known
> text<http://en.wikipedia.org/wiki/Well-known_text#Spatial_reference_systems>”
> (which is also, confusingly, the name that describes a standard for
> representing geometries) but it was quite verbose. Who, after all, could
> remember this:
>
> GEOGCS["WGS 84",
>
>     DATUM["WGS_1984",
>
>         SPHEROID["WGS 84",6378137,298.257223563,
>
>             AUTHORITY["EPSG","7030"]],
>
>         AUTHORITY["EPSG","6326"]],
>
>     PRIMEM["Greenwich",0,
>
>         AUTHORITY["EPSG","8901"]],
>
>     UNIT["degree",0.01745329251994328,
>
>         AUTHORITY["EPSG","9122"]],
>
>     AUTHORITY["EPSG","4326"]]
>
> More importantly, how would this fit cleanly into a URL?
>
> Fortunately, there already existed a large database of commonly used map
> projections: the EPSG database <http://www.epsg.org/CurrentDB.html>. 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.
>
> But, unlike me, most GIS practitioners haven’t memorized the EPSG database.
> So they frequently ask questions like *“what is the EPSG number for Oregon
> State-Plane South?”* and *“how do I find the EPSG number for this
> shapefile?”* One could search spatialreference.org, 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:
>
> SELECT srid, srtext FROM spatial_ref_sys WHERE srtext ILIKE '%oregon%';
>
> But today, I can provide a much simpler answer: *Use prj2epsg.org<http://prj2epsg.org/search>
> *. With *prj2epsg.org <http://prj2epsg.org/search>*, you can paste in full
> well-known text descriptions<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>,
> you can type in shorter keyword searches<http://prj2epsg.org/search?terms=bc+albers>,
> and you can even read a .prj file directly.
>
> This free public service is provided by OpenGeo <http://opengeo.org/> and
> our cloud services provider SkyGone <http://www.skygoneinc.com/>. The code
> is naturally all open source <http://svn.opengeo.org/prj2epsg/trunk/> and
> the service is built on top of the same GeoTools library that is at the
> heart of ourOpenGeo Suite <http://opengeo.org/products/suite>.
>
> And now we’re all hopefully one step closer to living happily ever after.
>
> Tags: epsg <http://blog.opengeo.org/tag/epsg/>, prj<http://blog.opengeo.org/tag/prj/>
> , shapefile <http://blog.opengeo.org/tag/shapefile/>, site<http://blog.opengeo.org/tag/site/>
> , well known text <http://blog.opengeo.org/tag/well-known-text/>, wkt<http://blog.opengeo.org/tag/wkt/>
>
> This entry was written by Paul Ramsey on Monday, June 14th, 2010 at 10:00
> am and is filed under Products<http://blog.opengeo.org/category/products/>.
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>
>
>
>
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