Re: 20050628: netCDF constants

Unidata Support <address@hidden> writes:

> ------- Forwarded Message
>
>>To: support <address@hidden>
>>From: "meteo.ru" <address@hidden>
>>Subject: netCDF constants
>>Organization: ?
>>Keywords: 200506281213.j5SCDaW4017924 netCDF missing data values
>
> Hello, support team.
>
> What are the constants of missing data values for each data type (e.g.
> int, double, char)?
>
> -- 
> Best regards, Sergey Sukhonosov                mailto:address@hidden

Howdy Sergey!

From netcdf.h:

/*
 *      Default fill values, used unless _FillValue attribute is set.
 * These values are stuffed into newly allocated space as appropriate.
 * The hope is that one might use these to notice that a particular datum
 * has not been set.
 */
#define NC_FILL_BYTE    ((signed char)-127)
#define NC_FILL_CHAR    ((char)0)
#define NC_FILL_SHORT   ((short)-32767)
#define NC_FILL_INT     (-2147483647L)
#define NC_FILL_FLOAT   (9.9692099683868690e+36f) /* near 15 * 2^119 */
#define NC_FILL_DOUBLE  (9.9692099683868690e+36)

For more information on fill values, take a look at:

http://my.unidata.ucar.edu/content/software/netcdf/docs/netcdf-c/Fill-Values.html

Does this answer your question?

Ed
-- 
Ed Hartnett  -- address@hidden