CLPX-Airborne: Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) Data

Summary

This data set consists of apparent surface reflectance, subpixel snow-covered area and grain size inferred from data acquired by the Airborne Visible/Infrared Imaging Spectrometer (AVIRIS).

Citing These Data

As a condition of using these data, you must cite the use of this data set using the following citation. For more information, see our Use and Copyright Web page.

Painter, T. 2006. CLPX Airborne: Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) Data. [indicate subset used]. Boulder, Colorado USA: NASA National Snow and Ice Data Center Distributed Active Archive Center. doi: 10.5067/R92TRY26ZN2Q.

Overview Table

Category Description
Data format Apparent surface reflectance: binary, short integer
Fractional snow-covered area: binary, floating point (data range N [0.0,1.0])
Subpixel snow grain radius: binary, floating point (data range N [0, 1100 micrometers])
Spatial coverage and resolution Southernmost Latitude: 39.70 N
Northernmost Latitude: 41.00 N
Westernmost Longitude: 107.00 W
Easternmost Longitude: 105.50 W

Coverage is not continuous.

Spatial resolution is approximately 1.5 m.
Temporal coverage and resolution 4-8 April 2002; 19-20 Februrary 2003; 25 March-1 April 2003
File naming convention File names include location names.
Reflectance files include ".rfl" in the file name.
Radiance files include ".img" in the file name.
Grain size files include ".grnsz" in the file name.
Snow cover files include ".snow" in the file name.
File size File sizes range from 2 B to 242 MB. Total distribution volume: 1.1 GB
Parameter(s) Apparent surface reflectance, subpixel snow-covered area, and grain size
Procedures for obtaining data Data are available via FTP and HTTPS.

Table of Contents

1. Contacts and Acknowledgments
2. Detailed Data Description
3. Data Access and Tools
4. Data Acquisition and Processing
5. References and Related Publications
6. Document Information

1. Contacts and Acknowledgments

Investigator

Thomas H. Painter
Jet Propulsion Laboratory
M/S 300-233
4800 Oak Grove Dr.
Pasadena, California USA 91109

Technical Contact

NSIDC User Services
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
Boulder, CO 80309-0449  USA
phone: +1 303.492.6199
fax: +1 303.492.2468
form: Contact NSIDC User Services
e-mail: nsidc@nsidc.org

2. Detailed Data Description

AVIRIS data have the following characteristics:

Format

Apparent surface reflectance: binary, short integer
Subpixel snow-covered area: binary, floating point (data range N [0.0,1.0])
Subpixel snow grain radius: binary, floating point (data range N [0, 1100 micrometers])

File and Directory Structure

Data are available on the FTP site in the ftp://sidads.colorado.edu/pub/DATASETS/CLP/data/airborne/nsidc0154_aviris/ directory. Within this directory, there are three folders and a ReadMe file. One folder contains data for the Intensive Observation Period 4 (IOP-4), one folder contains data for reflectances, and one folder contains data for radiances. Within the IOP folder, data files are organized by study area location.

File Naming Convention

The following codes are used in filenames:

File names include location names.
Reflectance files include ".rfl" in the file name.
Radiance files include ".img" in the file name.
Grain size files include ".grnsz" in the file name.
Snow cover files include ".snow" in the file name.
Vegitation cover files include ".veg" in the file name.

Each file is named by its location and then a date of the form yymmdd.

File Size

File sizes range from 2 B to 242 MB.

Spatial Coverage

Southernmost Latitude: 39.70 N
Northernmost Latitude: 41.00 N
Westernmost Longitude: 107.00 W
Easternmost Longitude: 105.50 W

Coverage is not continuous.

Spatial Resolution

Spatial resolution is approximately 1.5 m.

Temporal Coverage

AVIRIS measurements were made on 4-8 April 2002; 19-20 Februrary 2003; and 25 March-1 April 2003.

Parameters or Variables

Apparent surface reflectance

Subpixel snow-covered area

Grain size

Parameter Description

AVIRIS measures calibrated radiance. The data include apparent surface reflectance, subpixel snow-covered area, and grain size.

For a complete description of parameters and measurements, please refer to the Measurements section of the CLPX Plan.

3. Data Access and Tools

Data Access

Data are available via FTP and HTTPS.

Volume

Total data volume is 1.1 GB.

Related Data Collections

4. Data Acquisition and Processing

For complete information about data acquisition and processing regarding CLPX, please see the Cold Land Processes Field Experiment (CLPX) Plan Web Site.

For complete information about data acquisition and processing, please see JPL's AVIRIS Data Facility Web site.

5. References and Related Publications

Please see the References section of the CLPX Plan.

6. Document Information

List of Acronyms

The following acronyms and abreviations are used in this document:

Acronym Description
AVIRIS Airborne Visible/Infrared Imaging Spectrometer
CLPX Cold Land Processes Field Experiment
FTP File Transfer Protocol
IOP Intensive Study Period
NASA National Aeronautics and Space Administration
NSIDC National Snow and Ice Data Center
URL Uniform Resource Locator

Document Creation Date

12 April 2006

Document Revision Date

20 August 2007

Document URL

http://nsidc.org/data/docs/daac/nsidc0154_clpx_aviris/index.html