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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
I agree with Roy as to the facility and ease of use of GET operations. In my experience with web apps I typically route both posts and gets through the same handler. There really is no difference on the server. That said, uploading a file, for example, would require a post. BTW - a discussion we have been having around these parts is can you do > enough in the way of server-side functions without a POST (ie the URL > defines the function). That is why I would like to hear more from people > who are running F-TDS and GDS - how many requests do they get for server > side functions, but is the usual response time and download for these > request, how large are the usual expressions? And then contrast it with a > WPS or WCPS approach. I clearly believe in one approach, but I would > welcome people who are using some of these other approaches to describe > what they have done, the benefits of doing things that way, and what it > means for a client. > > A critical point that is missing in these discussions is what the end users require. We're talking about the *how* before discussing the *what*. I'd be interested to hear about how the existing services are used and/or what user's requirements might be going into the future. One thing to look at what does the IDV's (or other packages) derived quantity and end-user formula facility (see below for a subset of functions) provides. It would be a huge win to be able to provide these kinds of services on the server. -Jeff ------------------------------------------------- IDV grid functions: Gravity constant Wrapper for atan2 built-in Addition Multiply Divide Subtract Horizontal Advection, negative by convention Average of 2 scalars Absolute Vorticity Coriolis Parameter for all points in a grid Vector cross product magnitude Take the derivative with respect to the domain's X coordinate Take the derivative with respect to the domain's Y coordinate Total deformation Horizontal Divergence North relative direction of a vector Grid relative direction of a vector Vector dot product Jacobian Determinant Latitudue all points in a grid Laplacian operator Layer Average of a multi layer grid Layer Difference Magnitude of a vector Mixing Ratio from Temperature, RH (requires pressure domain) Create Relative Humidity from Temperature, mixing ratio (requires pressure domain) Potetial Vorticity (usually from theta and wind) Average over whole grid Average over grid subset Horizontal Flux Divergence Shear Deformation Smooth a scalar grid using a 5-point smoother Smooth a scalar grid using a 9-point smoother Stretching Deformation Potential Temperature from Temperature (requires pressure domain) Equivalent Potential Temperature from Temperature and Relative North relative u component Grid relative u component North relative v component Relative Vorticity Grid relative v component Average along a grid row Sum along a grid row Average along a grid column Sum along a grid column Average across the levels of a grid at all points Sum across the levels of a grid at all points Magnitude of the vertical wind shear in a layer Ageostrophic wind Partial x derivative of a vector Partial x derivative of a vector Frontogenesis function from theta and the wind geostrophic wind from height Gradient of a scalar Inertial advective wind Q-vector at a level ( K / m / s ) Q-vector ( K / m / s ) Smooth a scalar grid using a 5-point smoother (see sm5s) Smooth a scalar grid using a 9-point smoother (see sm9s) Thermal wind add the components of 2 vectors Make a true nort vector from two components Make a vector from two components calculate the vector layer average calculate the vector layer difference Multiply the components of 2 vectors Divide the components of 2 vectors subtract the components of 2 vectors
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