ITT ENVI .hdr Raw Raster Reader/Writer

FME Format Type Identifier	ENVIHDR
Reader/Writer	Both
Typical File Extensions	.bil, .bip, .bsq, .*

This module provides FME with access to ENVI .hdr header files and the associated raw raster files.

ENVI .hdr is a header file that stores the georeferencing information of an associated raw raster file. The georeferencing information is stored in the .hdr file with the keywords listed in the table below.

Header File Keywords

Keyword	Description/Values
band names	Default name for each band in the dataset. Required/Optional: Optional
bands	The number of bands of raster data in the dataset. Required/Optional: Required
byte order	Set to 1 for data files requiring data to be byte swapped to be used on Intel/Motorola hardware. Required/Optional: Optional
class lookup	Colormap lookup table used to map classes in a classification result to a specific color for display. This keyword is ignored if classes is not set. Required/Optional: Optional
class names	Names of the classes in the classification result. This keyword is ignored if classes is not set. Required/Optional: Optional
classes	Number of classes contained in a classification result. Required/Optional: Optional
data ignore value	The value of Nodata in this dataset. Required/Optional: Optional
data type	Data type of each pixel value in the dataset. Supported types include 8-bit unsigned integer, 16- and 32-bit signed and unsigned integer, 32- and 64-bit IEEE floating point. Unsupported types: Single and double precision complex, signed and unsigned 64-bit integer. Required/Optional: Required
description	A description of the image or processing performed. On reading this becomes the geometry name. On writing, this is taken from the geometry name if present, or the destination filename otherwise. Required/Optional: Optional
header offset	The number of bytes into the file where the raster data begins. Typically 0. Required/Optional: Optional
interleave	The order the pixels are arranged in the raster dataset. Required/Optional: Required
lines	The number of rows of raster data in the dataset. Required/Optional: Required
map info	Determines the coordinates of the upper left corner and the pixel size. Required/Optional: Optional
pixel size	The cell size of pixels in this dataset. Only used if map info is not present. Required/Optional: Optional
sample	The number of columns of raster data in the dataset. Required/Optional: Required
wavelength	Wavelengths are not directly supported in the ArcGIS framework, so they are appended to the band name, or used if no band name is present. Required/Optional: Optional
wavelength units	If wavelength information is also present, the wavelength units will be appended to the wavelength in the band name. Required/Optional: Optional

For each raster, there is only a single feature returned, since this feature will contain the entire raster.

ITT ENVI .hdr Raw Raster Product and System Requirements

Format	Product			Operating System
Reader/Writer	FME Desktop License	FME Server	FME Cloud	Windows	Linux	Mac
Reader	Available in FME Professional Edition and higher	Yes	Yes	64-bit: Yes	Yes	Yes
Writer	Available in FME Professional Edition and higher	Yes	Yes	64-bit: Yes	Yes	Yes

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Reader Overview

FME considers a single file to be a dataset.

Writer Overview

The ENVI .hdr writer creates and writes data into a single folder. It distinguishes duplicate output files by appending numbers to the filenames.

FME Raster Features

FME raster features represent raster data and use several concepts that are unlike those used in the handling of vector data.

For comprehensive information about how FME processes raster data, see Rasters.

ENVIHDR files can only be written with square pixel dimensions.

ENVIHDR supports rasters with an arbitrary number of bands, provided all bands are the same data type and no band has a palette.