.. _webadmin_demos:

Demos
=====

This page contains helpful links to various information pages regarding GeoServer and its features.  You do not need to be logged into GeoServer to access this page.

.. figure:: ../images/demos_view.png
   :align: center
   
   *Demos page*

Demo Requests
-------------

This page has example WMS, WCS and WFS requests for GeoServer that you can use, examine, and change.  Select a request from the drop down list.  

.. figure:: ../images/demos_requests.png
   :align: center

   *Selecting demo requests*

Both Web Feature Service (:ref:`wfs`) as well as Web Coverage Service (:ref:`wcs`) requests will display the request URL and the XML body. Web Map Service (:ref:`wms`) requests will only display the request URL.  


.. figure:: ../images/demos_requests_WFS.png
   :align: center
   
   *WFS 1.1 DescribeFeatureType sample request*

Click :guilabel:`Submit` to send the request to GeoServer.   For WFS and WCS requests, GeoServer will automatically generate an XML reponse.

.. figure:: ../images/demos_requests_schema.png
   :align: center
   
   *XML reponse from a WFS 1.1 DescribeFeatureType sample request*
   
Submitting a WMS GetMap request displays an image based on the provided geographic data.  

.. figure:: ../images/demos_requests_WMS_map.png
   :align: left
   
   *OpenLayers WMS GetMap request*
   
WMS GetFeatureInfo requests retrieve information regarding a particular feature on the map image.

.. figure:: ../images/demos_requests_WMS_feature.png
   :align: left
   
   *WMS GetFeatureInfo request*

.. _srs_list:

SRS
---

GeoServer natively supports almost 4,000 Spatial Referencing Systems (SRS), also known as **projections**, and more can be added. A spatial reference system defines an ellipsoid, a datum using that ellipsoid, and either a geocentric, geographic or projection coordinate system.  This page lists all SRS info known to GeoServer.

.. figure:: ../images/demos_SRS.png
   :align: left
   
   *Listing of all Spatial Referencing Systems (SRS) known to GeoServer*
   
The :guilabel:`Code` column refers to the unique integer identifier defined by the author of that spatial reference system.  Each code is linked to a more detailed description page, accessed by clicking on that code.

.. figure:: ../images/demos_SRS_page.png
   :align: left
   
   *Details for SRS EPSG:2000*


The title of each SRS is composed of the author name and the unique integer identifier (code) defined by the Author.  In the above example, the author is the `European Petroleum Survey Group <http://www.epsg.org/>`_ (EPSG) and the Code is 2000.  The fields are as follows:

:guilabel:`Description`: A short text description of the SRS.

:guilabel:`WKT`: A string describing the SRS.  WKT stands for "Well Known Text."

:guilabel:`Area of Validity`: The bounding box for the SRS.