UGRID Implementation in NetCDF-Java
kwilcox
some UGRID functionality will be integrated into the NetCDF-Java
libraries, based on the workings of this group.
An initial plan is available here for comment:
http://cloud.github.com/downloads/asascience/UGRID-Java/UGRID_implementation_in_NetCDF_Java.pdf.
Comments, thoughts, implementation ideas, concerns... everything is
welcome!
Christopher Barker
This is great stuff!
Some questions:
"""
1. �Extract data with coordinates (geospatial information) from UGRID
variable S?� (e.g. time series extraction from a point, extracting
current vectors for plotting)
- Load a subset of data for a specific time and depth index range, but
full nodal extent
- Determine the (T,Z,LAT,LON) coordinates using the existing CF rules
- If coordinates do not exist at the data locations, compute the
coordinate values based on location
on the cell (face, edge, etc)
"""
Does this involve interpolation if the requested point is not on a node
(or whatever)? If so, can the user specify the interpolation method
(including nearest neighbor) ?
"""
3. �RegridaUGRIDvariableontoaregulargrid�
- Return a NetCDF-Java �Grid� of the variable.
"""
This is going to require interpolation -- so the same question--can the
user specify the method, and what methods will be available?
""
4. �Extract a geospatial (lat,lon) subset� from a UGRID variable S.
""
How is a subset specified? bounding rectangle? polygon? And will the
topology be preserved in this case? What about boundary conditions?
It's great to see this moving forward.
-Chris
--
Christopher Barker, Ph.D.
Oceanographer
Emergency Response Division
NOAA/NOS/OR&R (206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception