IDV auto map projections

[John Caron]

Hi Lukas:

use:

     :standard_parallel = 30.0, 60.0; 

Lukas Lehner wrote:
> Hi
> 
> Back again.
> 
> The visible difference (what i can see) is in the attribute of variable
> Lambert_Conformal where in CF is only one parallel, but we got two -
> standard_parallel_1 and standard_parallel_2.
> 
> here is a sample file:
> http://www.cs.cas.cz/~lehner/t2_070411_00.nc
> 
> Some more info below.
> 
> John Caron napsal(a):
> 
>> Hi Lukas:
>>
>> It can be a subtle problem to diagnose if a file is "really" following 
>> CF correctly.
>>
>> You could try sending your file through here:
>>
>>  http://motherlode.ucar.edu:8080/thredds/cdmValidate.html
>>
>> and see if the results are helpful.
> 
> 
> Outcome of validation:
> 
> Summary:
> 
>     * Dataset contains useable gridded data.
>     * Some variables are not gridded fields; check that is what you expect.
> 
> Convention= CF-1.0
> 
> Coordinate Axes
> 
> Name     Declaration     AxisType     units     udunits     regular
> lat     float lat(x=66, y=78)     Lat     degrees_north     
> 0.017453292519943295 rad    
> lon     float lon(x=66, y=78)     Lon     degrees_east     
> 0.017453292519943295 rad    
> time     int time(time=79)     Time     hours since 
> 2007-04-11T00:00:00     date     1.0
> x     float x(x=66)     GeoX     m     m     9004.3
> y     float y(y=78)     GeoY     m     m     9028.5
> 
> Grid Coordinate Systems
> Name     X     Y     Vertical     Time
> time lat y lon x     lon     lat         time
> 
> Grid variables
> Name     Declaration     units     udunits     CoordSys
> t2     float t2(time=79, x=66, y=78)     K     K     time lat lon
> 
> Non-Grid variables
> Name     Declaration     units     udunits     CoordSys
> Lambert_Conformal     int Lambert_Conformal            
> 
> Seems to be fine
> 
>>
>> Or look at it in the ToolsUI program (Coordinate System Tab) and see 
>> what the INFO button tells you.
>>
>>  http://www.unidata.ucar.edu/content/software/netcdf-java/v2.2/webstart/index.html 
> 
> 
> 
> Not much too:
> 
> <?xml version="1.0" encoding="UTF-8"?>
> 
> <netcdfDatasetInfo
> location="/Volumes/fserver/storage/netcdf/Medard/domain2-test/t2/t2_070411_00.nc"> 
> 
> 
>   <convention name="CF-1.0" />
> 
>   <axis name="lat" decl="float lat(x=66, y=78)" type="Lat"
> units="degrees_north" udunits="0.017453292519943295 rad" />
> 
>   <axis name="lon" decl="float lon(x=66, y=78)" type="Lon"
> units="degrees_east" udunits="0.017453292519943295 rad" />
> 
>   <axis name="x" decl="float x(x=66)" type="GeoX" units="m" udunits="m"
> regular="9004.3" />
> 
>   <axis name="y" decl="float y(y=78)" type="GeoY" units="m" udunits="m"
> regular="9028.5" />
> 
>   <axis name="time" decl="int time(time=79)" type="Time" units="hours
> since 2007-04-11T00:00:00" udunits="date" regular="1.0" />
> 
>   <gridCoordSystem name="time lat y lon x" horizX="lon" horizY="lat"
> time="time" />
> 
>   <grid name="t2" decl="float t2(time=79, x=66, y=78)" units="K"
> udunits="K" coordSys="time lat lon" />
> 
>   <variable name="Lambert_Conformal" decl="int Lambert_Conformal"
> coordSys=" " />
> 
>   <userAdvice>Dataset contains useable gridded data.</userAdvice>
> 
>   <userAdvice>Some variables are not gridded fields; check that is what
> you expect.</userAdvice>
> 
> </netcdfDatasetInfo>
> 
> 
> 
> ----------------------
> Parsing with Convention = CF-1.0
>  Coordinate Variable added = x
>  Coordinate Variable added = y
>  Coordinate Variable added = time
>  CoordinateAxis = lat added; referenced from var= t2
>  CoordinateAxis = lon added; referenced from var= t2
>  created implicit coord System 'time lat y lon x' for var= t2
> 
>>
>>
>> For background on Conventions:
>>
>> http://www.unidata.ucar.edu/software/netcdf/conventions.html
>> http://www.unidata.ucar.edu/software/netcdf-java/reference/CSObjectModel.html 
>>
> 
> Here are the attributes and data of the file:
> 
> Attributes {
>     lat {
>         String long_name "latitude coordinate";
>         String standard_name "latitude";
>         String units "degrees_north";
>     }
>     lon {
>         String long_name "longitude coordinate";
>         String standard_name "longitude";
>         String units "degrees_east";
>     }
>     x {
>         String units "m";
>         String long_name "x coordinate of projection";
>         String standard_name "projection_x_coordinate";
>     }
>     y {
>         String units "m";
>         String long_name "y coordinate of projection";
>         String standard_name "projection_y_coordinate";
>     }
>     Lambert_Conformal {
>         String grid_mapping_name "lambert_conformal_conic";
>         Float64 standard_parallel_1 30.0;
>         Float64 standard_parallel_2 60.0;
>         Float64 longitude_of_central_meridian 12.0;
>         Float64 latitude_of_projection_origin 50.0;
>     }
>     time {
>         String long_name "forecast (valid) time";
>         String units "hours since 2007-04-10T06:00:00";
>         String standard_name "time";
>     }
>     t2 {
>         String long_name "2 m temperature";
>         String units "K";
>         String coordinates "lat lon";
>         String grid_mapping "Lambert_Conformal";
>     }
>     NC_GLOBAL {
>         String Conventions "CF-1.0";
>     }
> }
> 
> Dataset {
>     Grid {
>      ARRAY:
>         Float32 lat[x = 66][y = 78];
>      MAPS:
>         Float32 x[x = 66];
>         Float32 y[y = 78];
>     } lat;
>     Grid {
>      ARRAY:
>         Float32 lon[x = 66][y = 78];
>      MAPS:
>         Float32 x[x = 66];
>         Float32 y[y = 78];
>     } lon;
>     Float32 x[x = 66];
>     Float32 y[y = 78];
>     Int32 Lambert_Conformal;
>     Int32 time[time = 79];
>     Grid {
>      ARRAY:
>         Float32 t2[time = 79][x = 66][y = 78];
>      MAPS:
>         Int32 time[time = 79];
>         Float32 x[x = 66];
>         Float32 y[y = 78];
>     } t2;
> }
> 
> 
> 
>>
>>
>> Lukas Lehner wrote:
>>
>>> Hello
>>>
>>> I'm using idv 2.2b2, is it automatically using the information in the 
>>> netcdf header to draw the grid according to set up projection?
>>> Because it is still showing data in original lat-lon projection.
>>>
>>> I just don't know if this is idv feature or bug.
>>>
>>> The data in netcdf file follow CF convention.
>>>
>>> Thank you
>>> Lukas
>>>
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