Hi Tyn- > On Wed, 2008-03-05 at 08:08 -0700, Unidata IDV Support wrote: > > Hi Tyn- > > > You'd need something like the following: > > > > char Albers_Projection; > > :grid_mapping_name = "albers_conical_equal_area"; > > :standard_parallel = 20.0, 60.0; > > :longitude_of_central_meridian = -32.0; > > :latitude_of_projection_origin = 40.0; > > :false_easting = 0.0; > > :false_northing = 0.0; > > :_CoordinateTransformType = "Projection"; > > :_CoordinateAxisTypes = "GeoX GeoY"; > > > > and for projection_x_coordinate and projection_y_coordinate, you'd need to > > add: > > > > > > <attribute name="_CoordinateAxisType" type="String" value="GeoX" /> > > > > <attribute name="_CoordinateAxisType" type="String" value="GeoY" /> > > > > > O.k, this is what i came up with after your suggestions: > > <?xml version="1.0" encoding="UTF-8"?> > <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2"; > location="dods://iridl.ldeo.columbia.edu/SOURCES/.USGS/.ADDS/.NDVI/.NDVIrg/.dekadal/.maximum/.NDVI/dods" > > > <attribute name="title" type="String" value="NDVI" /> > <variable name="x" shape="x" type="double"> > <attribute name="units" type="String" value="m" /> > <attribute name="_CoordinateAxisType" type="String" value="GeoX" /> > <values start="-4604000" increment="8000" npts="1152" /> > </variable> > <variable name="y" shape="y" type="double"> > <attribute name="units" type="String" value="m" /> > <attribute name="_CoordinateAxisType" type="String" value="GeoY" /> > <values start="4604000" increment="8000" npts="1152" /> > </variable> > <variable name="Projection" type="char"> > <attribute name="Projection_Name" type="String" > value="albers_conical_equal_area" /> > <attribute name="latitude_of_projection_origin" type="double" value="1" /> > <attribute name="longitude_of_central_meridian" type="double" value="20.0" /> > <attribute name="standard_parallel_1" type="double" value="21" /> > <attribute name="standard_parallel_2" type="double" value="-19" /> > <attribute name="false_easting" type="double" value="0" /> > <attribute name="false_northing" type="double" value="0" /> > <attribute name="_CoordinateTransformType" type="String" value="Projection" /> > <attribute name="_CoordinateAxes" type="String" value="x y" /> > <values /> > </variable> > <variable name="NDVI" shape="T y x" type="double"> > <attribute name="long_name" type="String" value="normalized difference > vegetation index" /> > </variable> > </netcdf> > > I got the projection details from the IRI web catalog: > > http://iridl.ldeo.columbia.edu/SOURCES/.USGS/.ADDS/.NDVI/.NDVIrg/.dekadal/.maximum/.NDVI/ > > Now, IDV still complains "No gridded data found for:". Should i try and use > the netCDF version of this? > > http://iridl.ldeo.columbia.edu/SOURCES/.USGS/.ADDS/.NDVI/.NDVIrg/.dekadal/.maximum/.NDVI/data.cdf > > Or should the ncml enhancements also work on an OpenDAP data pointer? Your XML needed some tweaks: For the projection: - need to use standard_parallel with 2 values instead of _1 and _2 - the CoordinateAxes needs to be: <attribute name="_CoordinateAxisTypes" type="String" value="GeoX GeoY" /> - the attribute Projection_Name needs to be grid_mapping_name For the variable NVDI, you need to indicate that it uses the particular projection: <variable name="NDVI" shape="T y x" type="double"> <attribute name="long_name" type="String" value="normalized difference vegetation index" /> <attribute name="grid_mapping" value="Projection"/> </variable> Since this is following the CF-1.0 convention for the geolocation info, you need a global attribute: <attribute name="Conventions" type="String" value="CF-1.0" /> to specify that convention. The y axis needs to have a negative increment since it starts in the upper left corner. The ammended ncml file is attached. Let me know if you have other questions on this. Don Ticket Details =================== Ticket ID: FAY-719487 Department: Support IDV Priority: Normal Status: Open
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