title: How to store a grid of values in a PostGIS database such that it can be contoured by GeoServer?
body: <p>I'm planning to use GeoServer with a PostGIS database to provide contours over a Web Mapping Service.</p>
  
  <p>I have a simple lat-long grid of values which I want to store in the database and have contoured. Whilst the GeoServer user manual implies that it is possible in this example...</p>
  
  <p><a href="https://docs.geoserver.org/stable/en/user/styling/sld/extensions/rendering-transform.html#contour-extraction" rel="nofollow noreferrer">https://docs.geoserver.org/stable/en/user/styling/sld/extensions/rendering-transform.html#contour-extraction</a></p>
  
  <p>...it does not talk about what format the data should be in. Please can anyone suggest a suitable PostGIS database schema I can use that GeoServer will understand and be able to contour? Preferably one which will work with the GeoServer example from the link above.</p>
  
  <p>Thanks for your help.</p>