Changes between Version 2 and Version 3 of CowsFramework/GettingStarted


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Timestamp:
14/11/10 09:03:51 (9 years ago)
Author:
spascoe
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  • CowsFramework/GettingStarted

    v2 v3  
    1 = Getting started with COWS server and COWS client = 
    2  
    3 [[PageOutline]] 
    4  
    5 This page provides a quick overview on how to get started with a COWS server and COWS client applications. 
    6  
    7 == Setting up an example COWS server == 
    8  
    9 Here is a basic set of instructions for setting up a cowsserver instance with an example dataset. In the examples below it is assumed your test dataset CSML file has been called {{{mydataset.xml}}}. Note that this assumes you have installed all the dependencies and that their scripts are in your path: 
    10  
    11 1. Create your CSML file describing an example NetCDF file: 
    12  
    13 {{{ 
    14 # I'm going to use a NetCDF file called 'var1.nc' in $MYDATA dir 
    15 # I'll create my CSML file describing that data as '$MYDATA/mydataset.xml' 
    16  
    17 $ cd $MYDATA 
    18 $ csmlscan -i mydataset -N "My Dataset" -o mydataset.xml var1.nc 
    19 # Which writes: $MYDATA/mydataset.xml 
    20 }}} 
    21  
    22 2. Modify the pylons app configuration file {{{development.ini}}} to point at local paths and the required port: 
    23  
    24 ***ADD EXAMPLE CHANGES HERE*** 
    25  
    26 3. Go to the top-level directory containing the {{{development.ini}}} file and start the service: 
    27  
    28 The service can be run using paster or mod_wsgi, this example uses paster. 
    29  
    30 {{{ 
    31 $ paster serve development.ini 
    32 }}} 
    33  
    34 4. Now open a browser and look at the top-level catalogue page: 
    35  
    36 Note that the URL {{{http://<host>:<port>/}}} will route to the "catalogue" controller in the pylons app that shows, for each dataset (CSML file), the following links: 
    37  
    38 {{{ 
    39 Templates: 
    40   * WMS GetCapabilities - http://<host>:<port>/<dataset_id>/wms?service=WMS&request=GetCapabilities&id=None 
    41   * WCS GetCapabilities - http://<host>:<port>/<dataset_id>/wcs?service=WCS&request=GetCapabilities&id=None 
    42   * WMS GetCapabilities - http://<host>:<port>/<dataset_id>/wfs?service=WFS&request=GetCapabilities&id=None 
    43  
    44 Examples: 
    45   * WMS GetCapabilities - http://westerly.badc.rl.ac.uk:8444/mydataset/wms?service=WMS&request=GetCapabilities&id=None 
    46   * WCS GetCapabilities - http://westerly.badc.rl.ac.uk:8444/wcs?service=WCS&request=GetCapabilities&id=None 
    47   * WMS GetCapabilities - http://westerly.badc.rl.ac.uk:8444/wfs?service=WFS&request=GetCapabilities&id=None 
    48 }}} 
    49  
    50 5. Make a WMS !GetLegend call: 
    51  
    52 If you investigate the layer names in the WMS !GetCapabilities document (see above) then you can use a layer name to generate a request based on the template below: 
    53  
    54 {{{ 
    55   * template - http://<host>:<port>/<dataset_id>/wms?request=GetLegend&layers=<layer_name> 
    56   * example - http://westerly.badc.rl.ac.uk:8444/mydataset/wms?request=GetLegend&layers=mydataset_pqn 
    57 }}} 
    58  
    59 6. Make a WMS !GetMap call: 
    60  
    61 Insertion of the layer name into the template below should return a Map tile: 
    62  
    63 {{{ 
    64   * template - http://<host>:<port>/<dataset_id>/wms?SRS=EPSG%3A4326&VERSION=1.1.1&FORMAT=image%2Fpng&SERVICE=WMS&REQUEST=GetMap&STYLES=&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&TIME2794-12-01T00:00:00.0=&LAYERS=<layer_name>&BBOX=-29%2C-20%2C50%2C50&WIDTH=256&HEIGHT=256 
    65  
    66   * example - http://westerly.badc.rl.ac.uk:8444/mydataset/wms?SRS=EPSG%3A4326&VERSION=1.1.1&FORMAT=image%2Fpng&SERVICE=WMS&REQUEST=GetMap&STYLES=&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&TIME2794-12-01T00:00:00.0=&LAYERS=mydataset_pqn&BBOX=-29%2C-20%2C50%2C50&WIDTH=256&HEIGHT=256 
    67 }}} 
    68  
    69 7. Make a WCS !GetCoverage call: 
    70  
    71 You should be able to get a coverage from the WCS by adapting the template below: 
    72  
    73 {{{ 
    74   * template - http://<host>:<port>/<dataset_id>/wcs?request=GetCoverage&service=WCS&version=1.0.0&crs=EPSG:4326&format=cf-netcdf&coverage=<coverage_name>&bbox=-180,-90,180,90& 
    75  
    76   * example - http://westerly.badc.rl.ac.uk:8443/mydataset/wcs?request=GetCoverage&service=WCS&version=1.0.0&crs=EPSG:4326&format=cf-netcdf&coverage=mydataset_pqn&bbox=-180,-90,180,90& 
    77 }}} 
    78  
    79 == Setting up an example COWS client application == 
    80  
    81 The main cowsclient is currently the '''wmsviz''' controller that is served under {{{http://<host>:<port>/wmsviz}}}. 
    82  
    83 1. Modify the {{{development.ini}}} configuration file: 
    84  
    85 Go to the top-level cowsclient directory and modify the {{{development.ini}}} file and make changes (if you are not using the defaults). 
    86  
    87 {{{ 
    88 # Example changes to development.ini, if serving data from (host=westerly and port=844): 
    89 port = 8443 
    90 serverurl=http://westerly.badc.rl.ac.uk:8443 
    91 }}} 
    92  
    93 2. Modify the avilalable end points: 
    94  
    95 The cowsclient can be provided with various endpoints (URLs to WMS service capabilities) but can also be given endpoints interactively. Here are a few WMS end points (some of which are secured) that might be useful: 
    96  
    97 '''Public WMS endpoints''' 
    98  
    99 **TO COME*** 
    100  
    101 '''Secured WMS endpoints''' 
    102  
    103 http://ceda.ac.uk/cowsclient/wmsviz?REQUEST=GetDisplayOptions&URL=http%3A%2F%2Fceda.ac.uk%2Fcows%2Fcoapec_100yr_data%2Fwms%3Frequest%3DGetDisplayOptions%26layers%3Dcoapec_100yr_data_solar_2 
    104  
    105 3. Deploy the service using paster: 
    106  
    107 {{{ 
    108 $ paster serve development.ini 
    109 }}} 
    110  
    111 4. View the {{{wmsviz}}} controller from a browser: 
    112  
    113 Open the following page in a browser: 
    114  
    115 {{{ 
    116   * template - http://<host>:<port>/wmsviz 
    117   * example  - http://westerly.badc.rl.ac.uk:8443/wmsviz 
    118 }}} 
     1See http://cows.badc.rl.ac.uk/wiki/CowsFramework/GettingStarted