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ncWMS Installation and configuration  

2013-03-05 21:36:56|  分类: OpenLayer |  标签: |举报 |字号 订阅

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Installation and configuration

How do I add datasets to my ncWMS server?

The administrative web pages allow new datasets to be added. A "dataset" is a single NetCDF file, a single OPeNDAP endpoint, an  NcML file or a glob aggregation (in other words, something like "/path/to/*.nc").

I have a set of OPeNDAP URLs that I'd like to view as a single dataset in ncWMS

Sometimes an OPeNDAP provider will provide each timestep of a model output (for example) as a set of individual datasets, rather than a single aggregated dataset. In this case you probably won't want to create a new dataset in ncWMS for each timestep. There are three possible solutions:

  1. Construct an  NcML file to aggregate the remote URLs.
  2. Persuade your data provider to aggregate the timesteps or run an aggregation server.
  3. Run an OPeNDAP aggregation server yourself.

How is the default colour scale range set for each variable?

When a dataset is first loaded the default colour scale range is "guessed" by ncWMS using the following scheme: a "test extraction" of a low-resolution field from the first vertical level and first timestep from each variable in the first NetCDF file in the dataset is performed. ncWMS then finds the lowest and highest values in this field, then adds a small margin of error (10%) at each end. So if this first file isn't representative of the dataset as a whole, the guess will not be perfect. You can always edit the guess through the administrative web page or by editing config.xml. (See the "Controlling the default style for variables" section of the installation instructions.)

Where is the ncWMS configuration information held?

By default, this information is stored in $HOME/.ncWMS. The location of $HOME is system-dependent. The table below shows some examples, although your system setup may vary.

Windows 7C:\Users\username
Windows XPC:\Documents and Settings\username
Linux/Unix?/home/username, /users/username
Mac OSX/private/var/username

The location of the configuration information can be changed by editing WEB-INF/WMS-servlet.xml and changing the workingDirectory property of the ncwmsContext bean, e.g.:

    <bean id="ncwmsContext" class="uk.ac.rdg.resc.ncwms.config.NcwmsContext" init-method="init">
        <property name="workingDirectory" value="/path/to/new/location"/>
    </bean>

How can I run more than one ncWMS instance on the same server?

Install two copies of the WAR file in your application server: you'll need to rename one of them to ensure that the two instances are accessed under different URLs. Initially both instances will try to use the default working directory. You'll need to change the working directory of one or both instances (see "Where is the ncWMS configuration information held?" above).

How can I measure the performance of my ncWMS server?

See MeasuringWmsPerformance.


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