Feature Representation

In addition to the generic FME feature attributes that FME Workbench adds to all features (see About Feature Attributes), this format adds the format-specific attributes described in this topic.

ENVIHDR features specify a matrix of x, y, and z coordinates. For each raster, there will only be a single feature returned.

Attribute Name

Contents

envihdr_type

This will always be envihdr_raster.

envihdr_bbl Lists the bad band multiplier values of each band in an image (typically 0 for bad bands and 1 for good bands).
envihdr_data_gain_values Gain values for each band.
envihdr_data_offset_values Offset values for each band.
envihdr_default_bands Indicates which band numbers to automatically load into the Available Bands List gray scale or R, G, and B fields when the file is opened in ENVI.
envihdr_fwhm Lists full-width-half-maximum (FWHM) values of each band in an image. Units should be the same as those used for wavelength.
envihdr_reflectance_scale_factor The value that, when divided into your data, would scale it from 0-1 reflectance.
envihdr_sensor_type Instrument types, such as Landsat TM, SPOT, RADARSAT, and so on.
envihdr_spectra_names A comma-separated list of ASCII names pertaining to spectral library files.
envihdr_wavelength Lists the center wavelength values of each band in an image.
envihdr_wavelength_units Text string indicating the wavelength units.

envihdr_interleaving_type

The organization of the bands in the file. Acceptable values are BIL, which is band interleaved by line, BIP, which is band interleaved by pixel, and BSQ, which is band sequential. If not specified, the default interleaving is BSQ.

envihdr_tab_file_generation

Enables or disables the generation of a TAB file along with the output raster. The value can be yes or no. The default value is yes. This is a writer attribute.