SMEX02 Airborne GPS Bistatic Radar Data, Iowa

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Metadata Entity Set Information:

Language:

eng; usa

Character Set:

Value: UTF8
CodeList: MD_CharacterSetCode

Hierarchy Level:

Value: dataset
CodeList: MD_ScopeCode

Hierarchy Level Name:

SMEX02 Airborne GPS Bistatic Radar Data, Iowa

Contact:

Responsible Party:

Individual Name: Dallas Masters
Organization Name: University of Colorado
Contact:

Contact Phone:

Contact Voice Telephone: 1 303 492.4075

Contact Address:

Delivery Point: University of Colorado
City: Boulder
Administrative Area: CO
Postal Code: 80309-0431
Country: USA

Contact Online Resources:

Website: http://nsidc.org

Contact Role:

Value: principalInvestigator
CodeList: CI_RoleCode

Date Stamp:

2014-10-25

Metadata Standard Name:

ISO 19115 Geographic Information - Metadata First Edition

Metadata Standard Version:

ISO 19115:2003

Dataset URI:

http://nsidc.org/data/nsidc-0275.html

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Data Identification Information:

Citation:

Citation Information:

Title: SMEX02 Airborne GPS Bistatic Radar Data, Iowa
Date:
Date: 2005
Date Type:
Value: publication
CodeList: CI_DateTypeCode
Edition Date: 2005-08-11
Identifier: NSIDC-0275
Cited Responsible Party:

Responsible Party:

Individual Name: NSIDC DAAC User Services
Organization Name: NASA DAAC at the National Snow and Ice Data Center
Contact:

Contact Phone:

Contact Voice Telephone: 1 303 492-6199

Contact Address:

Delivery Point: National Snow and Ice Data Center
City: Boulder
Administrative Area: CO
Postal Code: 80309-0449
Country: USA
Email: nsidc@nsidc.org

Contact Online Resources:

Website: http://nsidc.org/daac/index.html

Contact Role:

Value: custodian
CodeList: CI_RoleCode

Responsible Party:

Individual Name: NSIDC User Services
Organization Name: National Snow and Ice Data Center
Contact:

Contact Phone:

Contact Voice Telephone: 1 303 492-6199

Contact Address:

Delivery Point: National Snow and Ice Data Center
City: Boulder
Administrative Area: CO
Postal Code: 80309-0449
Country: USA
Email: nsidc@nsidc.org

Contact Online Resources:

Website: http://nsidc.org

Contact Role:

Value: custodian
CodeList: CI_RoleCode

Abstract:

This data set contains measurements of Global Positioning System (GPS) signals reflected from the Earth’s surface and collected on an airborne platform. The measurements were taken over the Soil Moisture Experiments 2002 (SMEX02) Walnut Creek Watershed area in Iowa, USA. The reflections collected were from flat agricultural land with mostly corn and soybean crops in mid-development. Data were collected on 19, 25, 27 June 2002 and 1, 2, 5-8 July 2002. The data are categorized by campaigns and dates, and are processed into levels. Level “0” files are text files directly from the receiver. Levels above “0” are output in Hierarchical Data Format (HDF) format, ordered in UTC time and gzipped. The HDF files contain metadata in the form of attributes that describe the data seta and variables. The variables also contain attributes to self-describe the individual data pieces. A modified GPS Delay Mapping Receiver (DMR) tracks and measures the direct, line-of-sight, right hand circularly polarized (RHCP) signal of a GPS satellite. It also simultaneously measures the delayed, Earth- reflected, near-specular, left hand circularly polarized (LHCP) GPS signal. The DMR was mounted on the NCAR C-130 along with the Jet Propulsion Laboratory (JPL) Passive and Active L- and S-band (PALS) microwave instrument. GPS signal reflections were collected using the standard hemispherical RHCP antenna mounted on the roof of the aircraft, and a reversed polarization LHCP hemispherical antenna mounted on the belly. The receiver position is computed from either an external navigation source or the receiver's own GPS navigation solution, whichever is more accurate. The GPS surface reflections are georeferenced to a composite Earth consisting of the WGS-84 ellipsoid, the EGM96 geoid, and the GTOPO30 elevation model. The primary objective was to collect land reflections for sensitivity of the reflected GPS power to temporal and spatial soil moisture and foliage attenuation. The measurements are a form of bistatic radar and can be used to estimate the surface scattering coefficient (roughness and/or dielectric properties) and path delays between the direct and reflected GPS signals. Scattering coefficients can be used to estimate changes in surface soil moisture. These data were collected as part of a validation study for the Advanced Microwave Scanning Radiometer - Earth Observing System (AMSR-E). AMSR-E is a mission instrument launched aboard NASA's Aqua Satellite on 04 May 2002. AMSR-E validation studies linked to SMEX are designed to evaluate the accuracy of AMSR-E soil moisture data. Specific validation objectives include assessing and refining soil moisture algorithm performance; verifying soil moisture estimation accuracy; investigating the effects of vegetation, surface temperature, topography, and soil texture on soil moisture accuracy; and determining the regions that are useful for AMSR-E soil moisture measurements.

Purpose:

Scientific Research

Credit:

The following example shows how to cite the use of this data set in a publication. For more information, see our Use and Copyright Web page.

Masters, D. 2005. SMEX02 Airborne GPS Bistatic Radar Data, Iowa. [indicate subset used]. Boulder, Colorado USA: University of Colorado, Colorado Center for Astrodynamics Research.

Status:

Value: underDevelopment
CodeList: MD_ProgressCode

Point of Contact:

Responsible Party:

Individual Name: Dallas Masters
Organization Name: University of Colorado
Contact:

Contact Phone:

Contact Voice Telephone: 1 303 492.4075

Contact Address:

Delivery Point: University of Colorado
City: Boulder
Administrative Area: CO
Postal Code: 80309-0431
Country: USA

Contact Role:

Value: principalInvestigator
CodeList: CI_RoleCode

Responsible Party:

Individual Name: Dallas Masters
Organization Name: University of Colorado
Contact:

Contact Phone:

Contact Voice Telephone: 1 303 492.4075

Contact Address:

Delivery Point: University of Colorado
City: Boulder
Administrative Area: CO
Postal Code: 80309-0431
Country: USA

Contact Role:

Value: principalInvestigator
CodeList: CI_RoleCode

Responsible Party:

Individual Name: Stephen Katzberg
Organization Name: NASA Langley Research Center
Contact:

Contact Address:

Delivery Point: M.S. 328
City: Hampton
Administrative Area: VA
Postal Code: 23681-0001
Country: USA

Contact Role:

Value: principalInvestigator
CodeList: CI_RoleCode

Maintenance Information:

Maintenance and Update Frequency:

Value: asNeeded
CodeList: MD_MaintenanceFrequencyCode

Update Scope:

Value: dataset
CodeList: MD_ScopeCode

Value: series
CodeList: MD_ScopeCode

Value: attribute
CodeList: MD_ScopeCode

Contact:

Responsible Party:

Individual Name: Dallas Masters
Organization Name: University of Colorado
Contact:

Contact Phone:

Contact Voice Telephone: 1 303 492.4075

Contact Address:

Delivery Point: University of Colorado
City: Boulder
Administrative Area: CO
Postal Code: 80309-0431
Country: USA

Contact Online Resources:

Website: http://nsidc.org

Contact Role:

Value: principalInvestigator
CodeList: CI_RoleCode

Descriptive Keywords:

Keywords

Keyword: Continent > North America > United States Of America
Keyword Type:
Value: place
CodeList: MD_KeywordTypeCode
Keyword Thesaurus:

Citation Information:

Title: NASA / GCMD Location Keywords
Date:
Date: 2008-02-05
Date Type:
Value: revision
CodeList: CI_DateTypeCode

Keywords

Keyword: EARTH SCIENCE > Spectral/Engineering > Radar > Radar Imagery
Keyword Type:
Value: discipline
CodeList: MD_KeywordTypeCode
Keyword Thesaurus:

Citation Information:

Title: NASA / GCMD Science Keywords
Date:
Date: 2008-02-05
Date Type:
Value: revision
CodeList: CI_DateTypeCode

Keywords

Keyword: ISMEX > Iowa Soil Moisture Experiment
Keyword: SMEX02 > Soil Moisture Experiments in 2002
Keyword Type:
Value: theme
CodeList: MD_KeywordTypeCode
Keyword Thesaurus:

Citation Information:

Title: NASA / GCMD Project Keywords
Date:
Date: 2008-01-24
Date Type:
Value: revision
CodeList: CI_DateTypeCode

Keywords

Keyword: bistatic radar
Keyword: GPS
Keyword: Soil Moisture
Keyword: Surface Roughness
Keyword Type:
Value: theme
CodeList: MD_KeywordTypeCode

Dataset Constraints:

Legal Constraints:

Access Constraints:

Value: otherRestrictions
CodeList: MD_RestrictionCode

Use Constraints:

Value: otherRestrictions
CodeList: MD_RestrictionCode

Other Constraints:

Access Constraints : none

These data are considered exploratory. The techniques to estimate geophysical parameters from these data are being continuously refined. Usage of these data is granted without restriction, but acknowledgment of the source and PI is appreciated.

Language:

eng; usa

Character Set:

Value: UTF8
CodeList: MD_CharacterSetCode

Extent Information:

Spatial Temporal Extent:

Geographic Element:

Bounding Coordinates:

 

Westbound Longitude: -93.8
Eastbound Longitude: -93.4
Southbound Latitude: 41.915
Northbound Latitude: 42.005

Temporal Element:

Time Period:

Begin Position: 20020619
End Position: 20020708

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Distribution Information:

Distributor Information:

Distributor Contact:

Responsible Party:

Individual Name: NSIDC DAAC User Services
Organization Name: NASA DAAC at the National Snow and Ice Data Center
Contact:

Contact Phone:

Contact Voice Telephone: 1 303 492-6199

Contact Address:

Delivery Point: National Snow and Ice Data Center
City: Boulder
Administrative Area: CO
Postal Code: 80309-0449
Country: USA
Email: nsidc@nsidc.org

Contact Online Resources:

Website: http://nsidc.org/daac/index.html

Contact Role:

Value: custodian
CodeList: CI_RoleCode

Responsible Party:

Individual Name: NSIDC User Services
Organization Name: National Snow and Ice Data Center
Contact:

Contact Phone:

Contact Voice Telephone: 1 303 492-6199

Contact Address:

Delivery Point: National Snow and Ice Data Center
City: Boulder
Administrative Area: CO
Postal Code: 80309-0449
Country: USA
Email: nsidc@nsidc.org

Contact Online Resources:

Website: http://nsidc.org

Contact Role:

Value: custodian
CodeList: CI_RoleCode

Distribution Format(s):

Data File Format:

Name: HDF
Specification: FTP

Digital Transfer Options:

Offline Transfer Options:

Offline Resources:

Name:

Value: onLine
CodeList: MD_MediumNameCode
Medium Name: FTP

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Data Acquisition Information:

Instrument Information:

Instrument:

Name: GPS RECEIVERS
Type: sensor

Platform Information:

Platform:

Name: GPS > Global Positioning System Satellites
Description: satellite
Instrument: GPS RECEIVERS

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Metadata Views

ISO Text-Only

International Organization for Standardization (ISO) in plain text

ISO XML

International Organization for Standardization (ISO) in Extensible Markup Language (XML)

DIF HTML

NASA Global Change Master Directory (GCMD) Directory Interchange Format (DIF)

FGDC HTML

U.S. Federal Geographic Data Committee (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM)