Metaspectral Datasets
Some datasets such as ASTER and Landsat ETM+ put similar bands into separate groups. These are called metaspectral datasets. Each group of bands is treated as a separate raster in ENVI.
You must specify the correct raster when using image-processing routines such as ENVIRadiometricCalibrationTask. For example, you may only want to calibrate Landsat-8 multispectral bands to radiance. Landsat-8 data are stored in a three-element array. The first element (raster[0]) contains the multispectral data from the OLI sensor. Create a variable as follows:
MSIRaster = raster[0]
Then apply subsequent image-processing routines to MSIRaster.
The tables below list the correct array element to use when referencing specific groups of bands.
ASTER
ASTER Level-1A and Level-1B data are stored in a four-element array. Open the dataset as follows:
File = 'AST_L1B_00304102007185203_20101010013020_18032.hdf'
Raster = e.OpenRaster(File, EXTERNAL_TYPE='eos_aster')
|
Group
|
Bands
|
Array Element
|
|
Thermal infrared (TIR)
|
10-14
|
Raster[0]
|
|
Shortwave infrared (SWIR)
|
4-9
|
Raster[1]
|
|
Visible near-infrared (VNIR) 1
|
3B
|
Raster[2]
|
|
Visible near-infrared (VNIR) 2
|
1, 2, 3N
|
Raster[3]
|
Landsat 4-5 TM
Landsat TM data are stored in a two-element array. Open the dataset as follows:
File = 'LT52310671984201CUB00_MTL.txt'
Raster = e.OpenRaster(File)
|
Group
|
Bands
|
Array Element
|
|
Multispectral
|
1-5, 7
|
Raster[0]
|
|
Thermal
|
6
|
Raster[1]
|
Landsat-7 ETM+
Landsat ETM+ data are stored in a three-element array. Open the dataset as follows:
File = 'LE70340332002174EDC00_MTL.txt'
Raster = e.OpenRaster(File)
|
Group
|
Bands
|
Array Element
|
|
Multispectral
|
1-7
|
Raster[0]
|
|
Thermal
|
61-62
|
Raster[1]
|
|
Panchromatic
|
8
|
Raster[2]
|
Landsat-8
Landsat-8 data are stored in a five-element array. Open the dataset as follows:
File = 'LC80430342015121LGN00_MTL.txt'
Raster = e.OpenRaster(File)
|
Group
|
Band Names
|
Array Element
|
|
Multispectral (OLI)
|
Coastal aerosol, Blue, Green, Red, NIR, SWIR1, SWIR2
|
Raster[0]
|
|
Panchromatic
|
Panchromatic
|
Raster[1]
|
|
Cirrus
|
Cirrus
|
Raster[2]
|
|
Thermal (TIRS)
|
Thermal Infrared 1, Thermal Infrared 2
|
Raster[3]
|
|
Quality
|
Quality
|
Raster[4]
|
See Also
ENVIMetaspectralRaster