Macros
#define	NEP_UDF_GEOTIFF_BIGTIFF NC_UDF0

#define	NEP_UDF_GEOTIFF_STANDARD NC_UDF1

#define	NEP_UDF_GRIB2 NC_UDF2

#define	NEP_UDF_CDF NC_UDF4

#define	NEP_UDF_FITS NC_UDF3

#define	NEP_UDF_PDS4 NC_UDF5

Detailed Description

NetCDF-C exposes ten User-Defined Format (UDF) slots (UDF0–UDF9). Each NEP format handler occupies a permanently assigned slot so that multiple handlers can be enabled simultaneously without conflict. Slot assignments are stable across NEP releases; UDF6–UDF9 are reserved for future formats.

Slot	Macro	Format	Magic
UDF0	NEP_UDF_GEOTIFF_BIGTIFF	GeoTIFF BigTIFF	`II+`
UDF1	NEP_UDF_GEOTIFF_STANDARD	GeoTIFF standard TIFF	`II*`
UDF2	NEP_UDF_GRIB2	GRIB2 meteorological	`GRIB`
UDF3	NEP_UDF_FITS	FITS astronomical	`SIMPLE`
UDF4	NEP_UDF_CDF	NASA CDF space physics	`0xCDF30001`
UDF5	NEP_UDF_PDS4	NASA/ESA PDS4 planetary	`<?xml`
UDF6–9	—	Reserved	—

Call NC_GEOTIFF_initialize(), NC_GRIB2_initialize(), NC_FITS_initialize(), NC_CDF_initialize(), or NC_PDS4_initialize() to register the corresponding handler before calling nc_open(). With .ncrc autoload (NetCDF-C main branch) no explicit call is needed.

Macro Definition Documentation

◆ NEP_UDF_CDF

#define NEP_UDF_CDF NC_UDF4

NASA CDF format uses UDF4 slot

◆ NEP_UDF_FITS

#define NEP_UDF_FITS NC_UDF3

FITS astronomical data format uses UDF3 slot

◆ NEP_UDF_GEOTIFF_BIGTIFF

#define NEP_UDF_GEOTIFF_BIGTIFF NC_UDF0

GeoTIFF BigTIFF format uses UDF0 slot

◆ NEP_UDF_GEOTIFF_STANDARD

#define NEP_UDF_GEOTIFF_STANDARD NC_UDF1

GeoTIFF standard TIFF format uses UDF1 slot

◆ NEP_UDF_GRIB2

#define NEP_UDF_GRIB2 NC_UDF2

GRIB2 meteorological format uses UDF2 slot

◆ NEP_UDF_PDS4

#define NEP_UDF_PDS4 NC_UDF5

PDS4 planetary data system format uses UDF5 slot

Macros