Hi,
I feel we are getting closer to common understandment. First, for my mind you
exactly _do_ want to reproject your data, even if just on-the-fly from
epsg:23030 to epsg:4326. I do not know what projection you need to use with
Google Earth but let's hope that epsg:4326 is correct.
Mapserver is doing re-projection for you if you first tell it in LAYER the
original projection of the data, and in the MAP level the output projection.
Now I suppose your LAYER is ok if you have set the projection to
+init=epsg:23030.
I have never heard about using cs2cs for setting Mapserver projection but it
does not prove that it is not possible. The methods I have used are using epsg
code like "init=epsg:4230" or proj4-strings. The usage of the projection
strings is explained here:
http://mapserver.gis.umn.edu/docs/reference/mapfile/projection
Another document to look through is:
http://mapserver.gis.umn.edu/docs/howto/wms_server
I have to say that it was not very easy to find a document describing promptly
how to use Proj4 strings in mapfile, even that possibility is often mentioned
in discussions.
-Jukka-
________________________________
Lähettäjä: CARLA FERNANDEZ [mailto:[EMAIL PROTECTED]
Lähetetty: 18. maaliskuuta 2008 14:15
Vastaanottaja: Rahkonen Jukka
Kopio: [email protected]
Aihe: Re: [MAPSERVER-USERS] cs2cs problems
Hi Jukka,
Thanks very much for your interest!! and sorry for the conflicting
information...
I explain you, I have all my layers in epsg:23030, and I don't want to
reproject them. However, I want to set my WMS in WGS84-epsg:4326 (not
ETRS89-epsg:4230, sorry), so that I can load my WMS in Google-Earth without the
difference that it has (almost 130 meters) because of the differents reference
systems...It seems like MapServer ignores the projection settings in the map
section!! (because I set WGS84, like GoogleEarth)
And googleing I've read that I can use the cs2cs in the projection
object (map section), but I get this error:
msProcessProjection(): Projection library error. projection not named
I've tried several combinations, but nothing works...
PROJECTION
#"cs2cs +from +proj=utm +zone=30 +ellps=intl +units=m +no_defs no_defs
+to +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs no_defs"
"cs2cs +from +init=epsg:23030 +to +init=epsg:4326"
#"init=epsg:4326"
END
Thanks!!
2008/3/18, Rahkonen Jukka <[EMAIL PROTECTED]>:
Hi Carla,
Please remember to use "reply to all" in order to send your
message for the mailing list as well.
I hope I understand this correctly. So your original data
(the shapefile) is in epsg:23030? Then you should have in mapfile, in
corresponding LAYER section
PROJECTION
"init=epsg:23030"
END
Next, because you are willing to deliver that layer through WMS
in epsg:4230, it is good to add this to layer METADATA as
"wms_srs" "EPSG:4230"
By looking at my old mapfiles wms_srs metadata seems not to be
compulsory if WMS service will only be used in one output projection which is
the same as the main MAP projection. Anyway I believe it would be good habbit
to have it.
Third, you should give the default output projection in MAP
section as
PROJECTION
"init=epsg:4230"
END
And last calculate the bounding box containing your data in the
mapfile projection (epsg:4230) and feel in the values as EXTENT of the map
object.
I try to read your messages once again faithfully and I feel
you are giving a bit conflicting information. In one place you say you are
willing to publish your data in ETRS89, wich I believe to mean epsg:4258. If
this is the case then insert that value to "wms_srs" and mapfile projection
instead of 4230. Why do you play at all with epsg:4230 if your data are not
using it, and you don't want to any output in that projection either? Perhaps
I have just not understood what you are aiming at, but I hope you will have
luck with it.
-Jukka Rahkonen-
________________________________
Lähettäjä: CARLA FERNANDEZ [mailto:[EMAIL PROTECTED]
Lähetetty: 18. maaliskuuta 2008 11:50
Vastaanottaja: Rahkonen Jukka
Aihe: Re: [MAPSERVER-USERS] cs2cs problems
Thanks four your answer,
I've defined projections in my WMS before without
problems. In this case I want to change the projection of my WMS (to ETRS89)
with the layers in ED50, but if I just set the projection of the header's
mapfile like ETRS89, and I leave the layers' projections like ED50, it doesn't
work :(
Do you have any idea of how can I use the cs2cs??
Thanks!!
2008/3/17, Rahkonen Jukka <[EMAIL PROTECTED]>:
Hi,
I you want to define projections in mapfile
then there are two alternatives:
either give the espg code:
PROJECTION
"init=epsg:2393"
END
or proj4 strings:
PROJECTION
"+proj=tmerc +lat_0=0 +lon_0=27 +k=1.000000
+x_0=3500000
+y_0=0 +ellps=intl
+towgs84=-90.7,-106.1,-119.2,4.09,0.218,-1.05,1.37
+units=m +no_defs"
END
But perhaps you are aiming at something else by
using cs2cs?
-Jukka Rahkonen-
-----Alkuperäinen viesti-----
Lähettäjä: [EMAIL PROTECTED] puolesta: cfb
Lähetetty: ma 17.3.2008 15:49
Vastaanottaja: [email protected]
Aihe: [MAPSERVER-USERS] cs2cs problems
Hi,
I'm having problems with the projection again.
I've got a shape in
epsg:23030 (ED50 UTM 30N), but I want to set my
service in epsg:4230
(ETRS89). I've changed the extent, the
"wms_boundingbox" and the
"wms_latlonboundingbox" of my header's mapfile
to geographic coordinates
(epsg:4230 for ED50), and in the projection
object (always in the header, in
the layer object I leave epsg:23030) I put:
PROJECTION
'cs2cs +from +init=epsg:4230 +to +proj=4258
+no_defs +no_defs +no_defs
+no_defs +ellps=GRS80 +datum=ETRS89 +no_defs
+units=m'
END http://www.nabble.com/file/p16092875/epsg
epsg
For the second reference system, I've also
tried with "+proj=longlat" and
with "+init=epsg:4258", but I get always the
same error:
msProcessProjection(): Projection library
error. projection not named
The epsg file of my proj4 is attached (ms4w v.
2.2.7, MapServer 5.0.2)
Thanks in advance!!
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