AVIRIS-5 datasets are provided in netCDF-4 format, which can be opened in the geospatial analysis software ENVI. In this tutorial, we will learn how to open a AVIRIS-5 netCDF file correctly in ENVI software.
1. Download L1B granule¶
For this tutorial, we will use a granule AV520250801t165910
2. Open AVIRIS-5 granule in ENVI¶
Open ENVI and go to File > Open As > Scientific Formats > HDF5/NetCDF-4.
In the next window, select the file. This will be display a “Dataset Browser” as shown below. The following browser is from ENVI 6.2, yours might look little different based on what version of the software you are using.
3. Raster builder¶
Now, we will map the netCDF dataset to the raster building as 1) dataset, 2) metadata, and 3) georeference.
Dataset¶
Since this is a Level 1B radiance file, we will first add /radiance/radiance variable to the Raster 1 as shown below.
Metadata Fields¶
We will add additional metadata field to the raster builder. Some of the important metadata fields are shown below.
/radiance/wavelength to Metadata -> Wavelength
/radiance/fwhm to Metadata -> FWHM
/radiance/radiance/_FillValue to Metadata -> Data Ignore Value
Georeference¶
Now, assign both lat and lon coordinates to the “Geographic Information” fields
/lon to Geographic Information -> Longitude and
/lat to Geographic Information -> Latitude
4. ENVI¶
Once all required datasets are mapped, click “Open Rasters” button to open the AVIRIS-5 file into ENVI. You can also click Views > Reference Map Link to check the location of the image. And, click Display > Profiles > Spectral to display spectral profile of a pixel.
