Re: [thredds] Albers or LCC supported as a WMS projection on the TDS?

Hi Marcos,

Ah OK, I didn't realise that TDS still uses epsg-wkt.jar.  Out of interest, why 
do you do this instead of using the EPSG database that ships with Geotoolkit 
(and hence with standalone ncWMS)?

(Just to double-check - which version of ncWMS are you now synchronized with?)

Cheers,
Jon

From: Marcos Hermida [mailto:mhermida@xxxxxxxxxxxxxxxx]
Sent: 15 July 2013 15:16
To: Jon Blower
Cc: thredds@xxxxxxxxxxxxxxxx; guy.griffiths@xxxxxxxxxxxxx
Subject: Re: [thredds] Albers or LCC supported as a WMS projection on the TDS?

Hi Jay & Jon,

TDS still relies on the epsg.properties file in the epsg-wkt.jar and it does 
not support the ncWMS process for creating your own epsg.properties.
I was unable to reproduce the issue, actually, epsg:42303 is already in the 
epsg.properties shipped with TDS and it works on motherlode:
- request with epsg:4326:
http://thredds.ucar.edu/thredds/wms/grib/NCEP/DGEX/CONUS_12km/best?LAYERS=Temperature_isobaric&ELEVATION=50000&TIME=2013-07-15T00%3A00%3A00.000Z&TRANSPARENT=true&STYLES=boxfill%2Frainbow&CRS=EPSG%3A4326&COLORSCALERANGE=258.9%2C271.1&NUMCOLORBANDS=20&LOGSCALE=false&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&FORMAT=image%2Fpng&SRS=EPSG%3A43
 26&BB 
OX=-140.14654339665,2.0904137233527,-56.175327906289,67.692925825197&WIDTH=256&HEIGHT=256<http://thredds.ucar.edu/thredds/wms/grib/NCEP/DGEX/CONUS_12km/best?LAYERS=Temperature_isobaric&ELEVATION=50000&TIME=2013-07-15T00%3A00%3A00.000Z&TRANSPARENT=true&STYLES=boxfill%2Frainbow&CRS=EPSG%3A4326&COLORSCALERANGE=258.9%2C271.1&NUMCOLORBANDS=20&LOGSCALE=false&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&FORMAT=image%2Fpng&SRS=EPSG%3A4326&BBOX=-140.14654339665,2.0904137233527,-56.175327906289,67.692925825197&WIDTH=256&HEIGHT=256>

- request with epsg:42303:
http://thredds.ucar.edu/thredds/wms/grib/NCEP/DGEX/CONUS_12km/best?LAYERS=Temperature_isobaric&ELEVATION=50000&TIME=2013-07-15T00%3A00%3A00.000Z&TRANSPARENT=true&STYLES=boxfill%2Frainbow&CRS=EPSG%3A42303&COLORSCALERANGE=258.9%2C271.1&NUMCOLORBANDS=20&LOGSCALE=false&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&FORMAT=image%2Fpng&BBOX=-5415285.996340551
 ,-877566. 
198157914,2094855.9996948307,5226112.045634475&WIDTH=256&HEIGHT=256<http://thredds.ucar.edu/thredds/wms/grib/NCEP/DGEX/CONUS_12km/best?LAYERS=Temperature_isobaric&ELEVATION=50000&TIME=2013-07-15T00%3A00%3A00.000Z&TRANSPARENT=true&STYLES=boxfill%2Frainbow&CRS=EPSG%3A42303&COLORSCALERANGE=258.9%2C271.1&NUMCOLORBANDS=20&LOGSCALE=false&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&FORMAT=image%2Fpng&BBOX=-5415285.996340551,-877566.198157914,2094855.9996948307,5226112.045634475&WIDTH=256&HEIGHT=256>

So, there is no need to add epsg:42303 to the epsg.properties and  I'm not 
really sure what the problem might be. Jay, make sure you are running a clean 
new installation of TDS 4.3 and you have the epsg-wkt.jar in your 
$TOMCAT-HOME/webapps/thredds/WEB-INF/lib directory.

Cheers!

On 07/14/2013 12:27 PM, Jon Blower wrote:

Hi Jay,



In "standalone" ncWMS you can now create your own epsg.properties file to add 
your own projections to those in the Geotoolkit database.  I can't remember if 
this capability has also been migrated to THREDDS - Ethan may be able to 
advise.  Basically, if there is a file called 
org/geotoolkit/referencing/factory/epsg/epsg.properties on your classpath, 
ncWMS will pick this up and look for CRS definitions (in WKT) therein.



You could try creating such a file if it doesn't exist and adding your 
projection. Reboot the server, then test with a GetMap operation (it won't show 
up in GetCapabilities).



Cheers,

Jon



----------------------------------------------------------------------



Message: 1

Date: Fri, 12 Jul 2013 17:16:41 -0700

From: Jay Alder 
<jay.alder@xxxxxxxxxxxxxxxxxxx><mailto:jay.alder@xxxxxxxxxxxxxxxxxxx>

To: Ethan Davis <edavis@xxxxxxxxxxxxxxxx><mailto:edavis@xxxxxxxxxxxxxxxx>

Cc: thredds@xxxxxxxxxxxxxxxx<mailto:thredds@xxxxxxxxxxxxxxxx>

Subject: Re: [thredds] Albers or LCC supported as a WMS projection on

  the TDS?

Message-ID: 
<51E09C69.4030005@xxxxxxxxxxxxxxxxxxx><mailto:51E09C69.4030005@xxxxxxxxxxxxxxxxxxx>

Content-Type: text/plain; charset=ISO-8859-1; format=flowed



Hi Ethan.



I'm having a little trouble following along in this old thread. I'm trying to 
see if it is possible to use a North America variant of Albers in TDS 4.3. It 
doesn't seem like I can use the many projections listed in epsg.properties like 
I could in TDS 4.2, unless I'm not building the url correctly. I would like to 
use 42303, which is listed in epsg.properties, but it doesn't seem to be 
working for me. If I set the

version=1.1.1 the browser says file not found (rather than a TDS xml error). If 
I set the version to 1.3.0 I get an xml error saying 'The CRS

EPSG:42303 is not supported by this server'.



Is there a way to get this projection working in TDS? Here is the entry in 
epsg.properties.



42303=PROJCS["NAD83 / Albers

NorthAm",GEOGCS["NAD83",DATUM["North_American_Datum_1983",SPHEROID["GRS_1980",6378137,298.257222101],TOWGS84[0,0,0]],PRIMEM["Greenwich",0],UNIT["Decimal_Degree",0.0174532925199433]],PROJECTION["Albers_conic_equal_area"],PARAMETER["central_meridian",-96.0],PARAMETER["latitude_of_origin",23],PARAMETER["standard_parallel_1",29.5],PARAMETER["standard_parallel_2",45.5],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["Meter",1],AUTHORITY["EPSG","42303"]]



Thanks



On 10/17/2012 03:13 PM, Ethan Davis wrote:

Ack! Sorry about that. I'm always stumbling over the various types of

EPSG codes.



Yes, the Albers and LLC EPSG codes you gave are for particular types

of projections, in EPSG aka "coordinate operations methods". From

which can be built particular "coordinate operations" (which I assume

have specific parameter values though I'm having trouble finding them

in the database). And from there, the coordinate reference systems.



My understanding is that the epsg.properties file (in epsg-wkt.jar) is

used in TDS 4.2 but not in TDS 4.3 (GeoToolkit 3.04 vs 3.17). The one

in TDS 4.3 should be newer and a more complete list of EPSG CRSs. So,

once you decide which EPSG CRS codes you want to use, I suspect

requests for them will work without changes in TDS 4.3 but may need

the additions Marcos mentions below. On the other hand, it appears

that the epsg.properties file in TDS 4.2 already contains a WKT for

CRS 2205 and I suspect it contains other Albers and LLC based CRSs as well.



If that all works, another fun part is figuring out for each CRS the

valid values of the bounding box corners.



Ethan





On 10/17/2012 3:24 PM, Marcos Hermida wrote:

Hi Rich,



to define either a Lambert Conformal Projection or Albers Equals Area

you need to provide a set of parameters (standards parallels, central

meridians, northing, easting...) so there are whole family of LCC and

Albers projections that you can use. Here you can see some well

defined ones, with their EPSG codes:

Albers:

http://spatialreference.org/ref/epsg/?search=Albers+Equal+Area&srtext

=Search



LCC:

http://spatialreference.org/ref/epsg/?search=Lambert+Conic+Conformal+

2SP&srtext=Search





If you want to use some of them all you have to do is add the OGC WKT

to the epsg database that is used by ncWMS/THREDDS. That database is

the epsg.properties file that lives in the epsg-wkt.jar and those are

the actual projections supported by the ncWMS/THREDDS.

So, for instance, if you want to add the  Lambert Conic Conformal 2SP:

NAD83 / Massachusetts Island

(http://spatialreference.org/ref/epsg/2250/) you need to add to the

epsg.properties this OGC WKT:

http://spatialreference.org/ref/epsg/2250/ogcwkt/ with its EPSG code.

It would look like something like this:



2250=PROJCS["NAD83 / Massachusetts Island

(ftUS)",GEOGCS["NAD83",DATUM["North_American_Datum_1983",SPHEROID["GR

S

1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG

","6269"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degre

e",0.01745329251994328,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","42

69"]],UNIT["US

survey

foot",0.3048006096012192,AUTHORITY["EPSG","9003"]],PROJECTION["Lamber

t_Conformal_Conic_2SP"],PARAMETER["standard_parallel_1",41.4833333333

3333],PARAMETER["standard_parallel_2",41.28333333333333],PARAMETER["l

atitude_of_origin",41],PARAMETER["central_meridian",-70.5],PARAMETER[

"false_easting",1640416.667],PARAMETER["false_northing",0],AUTHORITY[

"EPSG","2250"],AXIS["X",EAST],AXIS["Y",NORTH]]







Cheers!





On 10/17/2012 11:53 AM, Rich Signell wrote:

Ethan,



That's great that Albers, LCC and others should work with TDS 4.3 WMS.



That means it should work on:

http://motherlode.ucar.edu:9080/thredds

which is at TDS 4.3.15.



So on that server, I can get this WMS request to work using EPSG:4326:



http://motherlode.ucar.edu:9080/thredds/wms/grib/NCEP/NAM/CONUS_12km

/files/NAM_CONUS_12km_20121017_1200.grib2?LAYERS=Temperature_height_

above_ground&ELEVATION=2&TIME=2012-10-17T12%3A00%3A00.000Z&TRANSPARE

NT=true&STYLES=boxfill%2Frainbow&CRS=EPSG%3A4326&COLORSCALERANGE=263

.7%2C302.6&NUMCOLORBANDS=20&LOGSCALE=false&SERVICE=WMS&VERSION=1.1.1

&REQUEST=GetMap&FORMAT=image%2Fpng&SRS=EPSG%3A4326&BBOX=-128.1615439

5928,13.676912081443,-76.323087918557,65.515368122164&WIDTH=256&HEIG

HT=256





But I can't get anything else to work.



Can you provide a modified version of the above request that works

for Albers (EPSG:9822) or LCC (EPSG:9802)



-Rich



On Wed, Oct 17, 2012 at 11:55 AM, Ethan Davis

<edavis@xxxxxxxxxxxxxxxx><mailto:edavis@xxxxxxxxxxxxxxxx> wrote:

Hi Rich,



Even if a CRS is not listed, both ncWMS and TDS WMS can handle

requests for any CRS supported by the underlying GeoToolkit

library. The CRS database in TDS 4.2 does not contain EPSG CRS 9822

or 9802. However, they should both be available in TDS 4.3. So, if

you are trying this on a TDS 4.3, you can just give it a try.



As for the WMS GetCapabilities CRS list, it is currently not user

configurable. For TDS 4.3 it would simply be a matter of a minor

code change (adding the two EPSG numbers to a list) and then

rebuilding. It is a bit more work in TDS 4.2, but not much harder,

along with adding the EPSG number to a list, we would need a WKT

for each of the new projections. (The CRS WKT needs to be in a form

the GeoToolkit can

read.)



We've kept the list to a minimum because in earlier versions we

listed all available projections and the list got quite large.



Are you using TDS 4.3? Do you need these CRS to be in the list or

is being able to request them enough?



Cheers,



Ethan



On 10/17/2012 8:17 AM, Rich Signell wrote:

TDS folks,



What would it take to get Albers or LCC supported as a projection

on the TDS WMS?



According to the WMS getCapabilities (for example:

http://motherlode.ucar.edu/thredds/wms/fmrc/NCEP/GFS/CONUS_191km/N

CEP-GFS-CONUS_191km_best.ncd?service=WMS&version=1.3.0&request=Get

Capabilities





the supported projections are:

<Title>Motherlode TDS</Title>

<CRS>EPSG:4326</CRS>

<CRS>CRS:84</CRS>

<CRS>EPSG:41001</CRS>

<CRS>EPSG:3857</CRS>

<CRS>EPSG:27700</CRS>

<CRS>EPSG:3408</CRS>

<CRS>EPSG:3409</CRS>

<CRS>EPSG:32661</CRS>

<CRS>EPSG:32761</CRS>



Okay, so we don't see Albers Equal Area (EPSG:9822) or Lambert

Conformal Conic 2SP (EPSG:9802) on the list.



But  TDS WMS is based on ncWMS, and on the ncWMS FAQ at:



http://www.resc.rdg.ac.uk/trac/ncWMS/wiki/FrequentlyAskedQuestions



it says that ncWMS "can produce images in any projection that is

supported by the GeoTools library".



And it appears that GeoTools can support both Albers and LCC:



http://docs.geotools.org/latest/javadocs/org/geotools/referencing/

operation/projection/package-summary.html





So would it be straightforward (or perhaps even easy) to allow the

TDS WMS to support these?



Thanks,

Rich



--

Ethan Davis                                       UCAR Unidata Program

edavis@xxxxxxxxxxxxxxxx<mailto:edavis@xxxxxxxxxxxxxxxx>                    
http://www.unidata.ucar.edu



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Oregon State University

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