Hi-
This is report of a recent discovery I made after repeatedly banging my
head against the wall, so I thought I should write it up here to help
future users. Basically, you MUST define your elevation dimension as a
Double in your schema (using ImageMosaic indexer.xml), even if your NetCDF
files define the z dimension as a float. Otherwise you get exceptions when
making WCS requests that say "illegal dataType: String not supported in
netcdf-3"
I was getting the following error when accessing my NetCDF-based
ImageMosaic with a request (to a private host) such as this:
http://nnew-vm9:8089/geoserver/RAL_WCS/wcs?service=WCS&version=2.0.0&request=GetCoverage&coverageId=RAL_WCS:CAT_GPML_GTG&subset=time(
"2016-04-14T02:00:00.000Z")&subset=elevation("13.411")&subset=LEADSECONDS("0")&format=application/x-netcdf4
(LEADSECONDS is a custom variable I've defined for our ImageMosaic)
Error returned in browser (similar in GeoServer logs):
<ows:Exception exceptionCode="NoApplicableCode">
<ows:ExceptionText>
java.lang.IllegalArgumentException: illegal dataType: String not supported
in netcdf-3 illegal dataType: String not supported in netcdf-3 []
</ows:ExceptionText>
</ows:Exception>
FYI, a the equivalent WMS request worked fine:
http://nnew-vm9:8089/geoserver/RAL_WCS/wms?service=WMS&version=1.1.0&request=GetMap&layers=RAL_WCS:CAT_GPML_GTG&styles=gtg&bbox=-120.0,22.0,-60.0,50.0&width=768&height=573&srs=EPSG:4326&format=image/png&time=2016-04-14T02:00:00.000Z&elevation=13.411&DIM_LEADSECONDS=0
When I changed the schema config from this:
<schema name="default" >
<attributes>the_geom:Polygon,location:String,imageindex:Integer,time:java.util.Date,z:Float,fileDate:java.util.Date,leadSeconds:Integer</attributes>
</schema>
to this:
<schema name="default" >
<attributes>the_geom:Polygon,location:String,imageindex:Integer,time:java.util.Date,z:Double,fileDate:java.util.Date,leadSeconds:Integer</attributes>
</schema>
the request started to work, returning a NetCDF file, instead of the
misleading exception text.
Also FYI, the NetCDF file headers look like this (note the float data type
for dimension z):
/d1/nnew/GeoServer/8089_server/GTG_index: ncdump -h
../GTG_granules/lambert_sample_20160414T020000000Z_l_0000000.nc
netcdf lambert_sample_20160414T020000000Z_l_0000000 {
dimensions:
time = 1 ;
x = 451 ;
y = 337 ;
z = 46 ;
variables:
double time(time) ;
time:standard_name = "time" ;
time:long_name = "data valid time" ;
time:units = "seconds since 1970-01-01T00:00:00Z" ;
time:calendar = "gregorian" ;
time:axis = "T" ;
time:reference_date = "2016-04-14T02:00:00Z" ;
float x(x) ;
x:standard_name = "projection_x_coordinate" ;
x:units = "km" ;
x:axis = "X" ;
float y(y) ;
y:standard_name = "projection_y_coordinate" ;
y:units = "km" ;
y:axis = "Y" ;
float lat(y, x) ;
lat:standard_name = "latitude" ;
lat:units = "degrees_north" ;
float lon(y, x) ;
lon:standard_name = "longitude" ;
lon:units = "degrees_east" ;
float z(z) ;
z:standard_name = "altitude" ;
z:long_name = "Specific altitude above mean sea level" ;
z:units = "km" ;
z:positive = "up" ;
z:axis = "Z" ;
int grid_mapping ;
grid_mapping:grid_mapping_name = "lambert_conformal_conic" ;
grid_mapping:longitude_of_central_meridian = -95.f ;
grid_mapping:latitude_of_projection_origin = 25.f ;
grid_mapping:standard_parallel = 25.f ;
float CAT_GPML(time, z, y, x) ;
CAT_GPML:valid_min = 0.f ;
CAT_GPML:valid_max = 0.5949897f ;
CAT_GPML:_FillValue = -9999.f ;
CAT_GPML:long_name = "Clear Air Turbulence (CAT)" ;
CAT_GPML:units = "%" ;
CAT_GPML:coordinates = "lon lat" ;
CAT_GPML:grid_mapping = "grid_mapping" ;
// global attributes:
:Conventions = "CF-1.6" ;
:source = "US NWS - NCEP - Aviation Weather Center" ;
:title = "Rapid Refresh (RAP)" ;
:history = "Converted to NetCDF from Grib2 with Grib2toNc from NCAR-RAL." ;
}
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