CLPX-Satellite: EO-1 Hyperion Surface Reflectance, Snow-Covered Area, and Grain Size

Summary

This data set consists of apparent surface reflectance, subpixel snow-covered area, and grain size collected from the Hyperion hyperspectral imager. The Hyperion imager has a spectral range of 400-2500 nm, a spectral resolution of 10 nm, spatial resolution of 30 m, and a swath width of 7.8 km. Sampling is scene based (256 samples, 512 lines).

The capabilities of Hyperion provide resolve surface properties into hundreds of spectral bands versus the six optical multispectral bands flown on traditional Landsat imaging missions. Through these large number of spectral bands, complex land ecosystems can be imaged and accurately classified.

This data set is part of the NASA Cold Land Processes Field Experiment (CLPX). The NASA CLPX is a multi-sensor, multi-scale experiment that focuses on extending a local-scale understanding of water fluxes, storage, and transformations to regional and global scales. Within a framework of nested study areas in the central Rocky Mountains of the western United States, ranging from 1-ha to 160,000 km2, intensive ground, airborne, and spaceborne observations are collected. Data collection focuses on two seasons: mid-winter, when conditions are generally frozen and dry, and early spring, a transitional period when both frozen and thawed, dry and wet conditions are widespread.

Data are available via FTP.

CAUTIONARY NOTE: These data have not been reviewed for quality. Known issues exist in the processing of these data. Until this disclaimer has been removed, users should send questions and comments about this data set to nsidc@nsidc.org. NSIDC will forward these inquiries to the PI for resolution.

Citing These Data

We kindly request that you cite the use of this data set in a publication using the following citation. For more information, see our Use and Copyright Web page.

Painter, T. 2006. CLPX-Satellite: EO-1 Hyperion Surface Reflectance, Snow-Covered Area, and Grain Size. [indicate subset used]. Boulder, Colorado USA: NASA DAAC at the National Snow and Ice Data Center.

Overview Table

Category Description
Data format Apparent surface reflectance: binary, short integer
Subpixel snow-covered area: binary, floating point (data range ν [0,1])
Subpixel snow grain radius: binary, floating point (data range ν [0, 1100 micrometers])
Spatial coverage and resolution Southernmost Latitude: 39.60 N
Northernmost Latitude: 40.30 N
Westernmost Longitude: 106.00 W
Easternmost Longitude: 105.70 W

Spatial resolution: 30 m

Temporal coverage and resolution Data were acquired on 15 February 2002 and 19 March 2002
File naming convention Files names begin with date of collection of the form yyyymmdd.
File size Apparent surface reflectance: 608 Mb
Products (snow/rock/vegitation covered area, grain size): 6 Mb
Total data set volume: 724 MB
Parameter(s) Apparent surface reflectance, subpixel snow-covered area, and snow grain size
Procedures for obtaining data Data are available via FTP.

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
CIRES/National Snow and Ice Data Center
University of Colorado
Boulder, CO 80309-0216

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

CAUTIONARY NOTE: These data have not been reviewed for quality. Known issues exist in the processing of these data. Until this disclaimer has been removed, users should send questions and comments about this data set to nsidc@nsidc.org. NSIDC will forward these inquiries to the PI for resolution.

Hyperion data have the following characteristics:

Format

Apparent surface reflectance: binary, short integer
Subpixel snow-covered area: binary, floating point (data range ν [0,1])
Subpixel snow grain radius: binary, floating point (data range ν [0, 1100 micrometers])

File and Directory Structure

The data consist of fourteen binary ENVI files in a single directory. Seven files each for the two dates that measurements were taken.

File Naming Convention

The following codes are used in the seven diferent files:

File Size

Apparent surface reflectance: 608 Mb
Products (snow covered area, grain size): 6 Mb

Spatial Coverage

Southernmost Latitude: 39.60 N
Northernmost Latitude: 40.30 N
Westernmost Longitude: 106.00 W
Easternmost Longitude: 105.70 W

Spatial Resolution

Spatial resolution is 30 m.

Temporal Coverage

Hyperion measurements were made on 15 February 2002 and 19 March 2002.

Parameter or Variable

Parameter Description

Hyperion measures 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.

Volume

Total data set volume is 724 MB.

Related Data Collections

4. Data Acquisition and Processing

For complete information about data acquisition and processing, please see the Cold Land Processes Field Experiment (CLPX) Plan 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 are used in this document:

Acronym Definition
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

13 April 2006

Document Revision Date

23 August 2007

Document URL

http://nsidc.org/data/docs/daac/nsidc0148_clpx_hyperion/index.html