Licensing options for this format begin with FME Professional Edition.
The ENVI .hdr Raster Reader/Writer module provides FME with access to ENVI .hdr header file and the associated raw raster file.
Overview
ENVI .hdr file 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:
|
Keyword |
Value |
Required/Optional |
|
sample |
The number of columns of raster data in the dataset. |
Required |
|
lines |
The number of rows of raster data in the dataset. |
Required |
|
bands |
The number of bands of raster data in the dataset. |
Required |
|
interleave |
The order the pixels are arranged in the raster dataset. |
Required |
|
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 |
| 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. | Optional |
|
header offset |
The number of bytes into the file where the raster data begins. Typically 0. |
Optional |
|
byte order |
Set to 1 for data files requiring data to be byte swapped to be used on Intel/Motorola hardware. |
Optional |
|
classes |
Number of classes contained in a classification result. |
Optional |
|
class names |
Names of the classes in the classification result. This keyword is ignored if classes is not set. |
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. |
Optional |
|
band names |
Default name for each band in the dataset. |
Optional |
|
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. |
Optional |
|
wavelength units |
If wavelength information is also present, the wavelength units will be appended to the wavelength in the band name. |
Optional |
|
pixel size |
The cell size of pixels in this dataset. Only used if map info is not present. |
Optional |
|
map info |
Determines the coordinates of the upper left corner and the pixel size. |
Optional |
|
data ignore |
The value of NODATA in this dataset. |
Optional |
For each raster, there is only a single feature returned, since this feature will contain the entire raster.