# ICRAF-ISRIC Soil VNIR Spectral Library

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Distribution_Information
Metadata_Reference_Information

## Identification Information

Section Index

Citation:

Citation Information:

Originator: World Agroforestry Centre (ICRAF) and ISRIC - World Soil Information
Publication Date: 2010
Title: ICRAF-ISRIC Soil VNIR Spectral Library
Geospatial Data Presentation Form: tabular digital data
Publication Information:

Publication Place: Nairobi, Kenya
Publisher: World Agroforestry Centre (ICRAF)

Online Linkage: http://africasoils.net/

Description:

Abstract:

The ICRAF-ISRIC Soil VNIR Spectral Library contains visible near infrared spectra of 4,438 soils selected from the Soil Information System (ISIS) of the International Soil Reference and Information Centre (ISRIC). The samples consist of all physically archived samples at ISRIC in 2004 for which soil attribute data was available. The spectra were measured at the World Agroforestry Center's (ICRAF) Soil and Plant Spectral Diagnostic Laboratory. The samples are from 58 countries spanning Africa, Asia, Europe, North America, and South America. Associated attribute data, such as geographical coordinates, horizon (depth), and physical and chemical properties, are provided in a single relational database.

Purpose: To provide a resource for research and applications for sensing soil quality both in the laboratory and from space

Time Period of Content:

Currentness Reference: publication date

Status:

Progress: Complete
Maintenance and Update Frequency: As needed

Spatial Domain:

Bounding Coordinates:

West Bounding Coordinate: -180.000000
East Bounding Coordinate: 180.000000
North Bounding Coordinate: 90.000000
South Bounding Coordinate: -80.000000

Keywords:

Theme:

Theme Keyword Thesaurus: CSA-NBII Biocomplexity
Theme Keyword: Remote Sensing

Theme:

Theme Keyword Thesaurus: Data Granularity
Theme Keyword: Country

Theme:

Theme Keyword Thesaurus: NBII Node
Theme Keyword: Northeast Information Node (NIN)

Theme:

Theme Keyword Thesaurus: GCMD Parameter Valids
Theme Keyword: EARTH SCIENCE > Land Surface > Soils > Soil Chemistry
Theme Keyword: EARTH SCIENCE > Land Surface > Soils > Soil Classification
Theme Keyword: EARTH SCIENCE > Land Surface > Soils > Soil Color
Theme Keyword: EARTH SCIENCE > Land Surface > Soils > Soil Structure
Theme Keyword: EARTH SCIENCE > Land Surface > Soils > Soil Temperature
Theme Keyword: EARTH SCIENCE > Land Surface > Soils > Soil Texture

Theme:

Theme Keyword Thesaurus: CIESIN Indexing Vocabulary Version 2.1 (GCMD Format)
Theme Keyword: CIESIN > Land and Freshwater Resources > Soils > Soil Characteristics
Theme Keyword: CIESIN > Land and Freshwater Resources > Soils > Soil Chemistry
Theme Keyword: CIESIN > Land and Freshwater Resources > Soils > Soil Color
Theme Keyword: CIESIN > Land and Freshwater Resources > Soils > Soil Moisture
Theme Keyword: CIESIN > Land and Freshwater Resources > Soils > Soil Structure
Theme Keyword: CIESIN > Land and Freshwater Resources > Soils > Soil Texture
Theme Keyword: CIESIN > Land and Freshwater Resources > Soils > Soil Types

Theme:

Theme Keyword Thesaurus: EI Gateway Vocabulary
Theme Keyword: Topographic and Land Characteristics

Theme:

Theme Keyword Thesaurus: General
Theme Keyword: Remote Sensing
Theme Keyword: Satellite Imagery
Theme Keyword: Spectral Library
Theme Keyword: Soils
Theme Keyword: Visible and Near-Infrared
Theme Keyword: VNIR

Theme:

Theme Keyword Thesaurus: ISO Topic
Theme Keyword: Geoscientific Information

Theme:

Theme Keyword Thesaurus: GIS Format
Theme Keyword: Non-GIS

Theme:

Theme Keyword Thesaurus: Project
Theme Keyword: Africa Soil Information Service (AfSIS)

Place:

Place Keyword Thesaurus: CIESIN Location Terms, version 2.0
Place Keyword: Continent/Region > Africa
Place Keyword: Continent/Region > Asia
Place Keyword: Continent/Region > Central Africa
Place Keyword: Continent/Region > Central America
Place Keyword: Continent/Region > East Asia
Place Keyword: Continent/Region > Equatorial
Place Keyword: Continent/Region > Europe
Place Keyword: Continent/Region > North America
Place Keyword: Continent/Region > South America
Place Keyword: Continent/Region > South Asia
Place Keyword: Continent/Region > Southeast Asia
Place Keyword: Continent/Region > West Africa
Place Keyword: Country/Island > Australia
Place Keyword: Country/Island > Benin
Place Keyword: Country/Island > Botswana
Place Keyword: Country/Island > Brazil
Place Keyword: Country/Island > Burkina Faso
Place Keyword: Country/Island > Cameroon
Place Keyword: Country/Island > China
Place Keyword: Country/Island > Colombia
Place Keyword: Country/Island > Costa Rica
Place Keyword: Country/Island > Cote D'Ivoire
Place Keyword: Country/Island > Cuba
Place Keyword: Country/Island > Democratic Republic of the Congo
Place Keyword: Country/Island > Ecuador
Place Keyword: Country/Island > Finland
Place Keyword: Country/Island > France
Place Keyword: Country/Island > Gabon
Place Keyword: Country/Island > Germany
Place Keyword: Country/Island > Ghana
Place Keyword: Country/Island > Greece
Place Keyword: Country/Island > Hungary
Place Keyword: Country/Island > India
Place Keyword: Country/Island > Indonesia
Place Keyword: Country/Island > Ireland
Place Keyword: Country/Island > Italy
Place Keyword: Country/Island > Jamaica
Place Keyword: Country/Island > Japan
Place Keyword: Country/Island > Kenya
Place Keyword: Country/Island > Malaysia
Place Keyword: Country/Island > Mali
Place Keyword: Country/Island > Mozambique
Place Keyword: Country/Island > Namibia
Place Keyword: Country/Island > Netherlands
Place Keyword: Country/Island > Nicaragua
Place Keyword: Country/Island > Niger
Place Keyword: Country/Island > Nigeria
Place Keyword: Country/Island > Norway
Place Keyword: Country/Island > Oman
Place Keyword: Country/Island > Pakistan
Place Keyword: Country/Island > Peru
Place Keyword: Country/Island > Philippines
Place Keyword: Country/Island > Poland
Place Keyword: Country/Island > Romania
Place Keyword: Country/Island > Rwanda
Place Keyword: Country/Island > Samoa
Place Keyword: Country/Island > Slovakia
Place Keyword: Country/Island > Spain
Place Keyword: Country/Island > Sri Lanka
Place Keyword: Country/Island > Sweden
Place Keyword: Country/Island > Thailand
Place Keyword: Country/Island > Togo
Place Keyword: Country/Island > Turkey
Place Keyword: Country/Island > United States
Place Keyword: Country/Island > Uruguay
Place Keyword: Country/Island > Zambia
Place Keyword: Country/Island > Zimbabwe

Access Constraints: None
Use Constraints:

ISRIC's procedures for data use and citation at http://www.isric.org/UK/About+ISRIC/Services/Data+Supply/Citation.htm apply. Please use this suggested citation: World Agroforestry Centre (ICRAF) and ISRIC - World Soil Information. 2010. ICRAF-ISRIC Soil VNIR Spectral Library. Nairobi, Kenya: World Agroforestry Centre (ICRAF). Available at http://africasoils.net/.

Point of Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: World Agro-forestry Centre (ICRAF)

Contact Address:

Address Type: mailing and physical address
Address: ICRAF Complex, United Nations Avenue, Gigiri, PO Box 30677
City: Nairobi
Country: KENYA

Contact TDD/TTY Telephone: afsis.info@africasoils.net
Contact Facsimile Telephone: +254 2 524001

## Data Quality Information

Section Index

Lineage:

Process Step:

Process Description:

Soil diffuse reflectance spectra were recorded for each library sample using a FieldSpec FR spectroradiometer (Analytical Spectral Devices, Boulder, CO) at wavelengths from 0.35 to 2.5 microns with a spectral sampling interval of 1 nm. The instrument had been calibrated by the manufacturer on an annual basis. The optical setup was as reported in Shepherd et al. (2003). Samples were illuminated from below using a high-intensity source probe (Analytical Spectral Devices, Boulder, CO). The probe illuminates the sample (4.5 W halogen lamp giving a correlated color temperature of 3000 K; WelchAllynSkaneatles Falls, NY, USA) and collects the reflected light from a 3.5-cm-diameter sapphire window through a fiber-optic-cable.
About 20 g of air-dried soil ground to pass through a 2-mm sieve were placed into 7.4 cm diameter Duran glass Petri dishes to give a sample height of about 1 cm. To sample within-dish variation, reflectance spectra were recorded at two positions, successively rotating the sample dish through 90 degrees between readings and an average of 25 spectra (the manufacturer?s default value) was recorded at each position to minimize instrument noise. Before reading each sample 10 white reference spectra were recorded using calibrated spectralon (Labsphere, Sutton, NH, USA) placed in a glass petri dish. The certified white reference reflectance factors are given in Table 1. Reflectance readings for each wavelength band were expressed relative to the average of the white reference readings. The 1 nm interval spectra was resampled by selecting every tenth-nanometer value from 0.35 to 2.5 microns to give a total of 216 data points for each spectrum.
Soil property attributes were provided by ISRIC and had been analysed according to the ISRIC Procedures for soil analysis (Van Reeuwijk, 2002). Soil samples were air-dried, clods crushed and the resulting sample material sieved through a 2 mm sieve prior to further analysis. Soil pH was determined by shaking soil together with deionized water for two hours in a soil:liquid ratio of 1:2.5. Organic carbon content was determined using the Walkley-Black procedure. This involves a wet combustion of the organic matter with a mixture of potassium dichromate and sulfuric acid at about 125 degrees C. Cation exchange capacity and exchangeable Ca and Mg were determined using the ammonium acetate method, which included usage of sodium acetate instead of ammonium acetate for samples with a pH value above 7. Exchangeable Ca and Mg were measured by flame atomic absorption spectrophotometry and CEC by flame emission spectrophotometry. Removal of soil organic matter and carbonates prior to soil texture analysis was done using hydrogen peroxide and hydrochloric acid respectively. The sand fraction was separated first by wet sieving. Clay fractions were determined by the pipette method.

## Spatial Data Organization Information

Section Index

## Distribution Information

Section Index

Distributor:

Contact Information:

Contact Organization Primary:

Contact Organization: International Center for Tropical Agriculture- Tropical Soil Biology and Fertility Institute (CIAT-TSBF)

Contact Address:

Address Type: mailing and physical address
Address: ICRAF Complex, United Nations Avenue, Gigiri, PO Box 30677
City: Nairobi
Country: Kenya

Contact Electronic Mail Address: afsis.info@africasoils.net

Resource Description: ICRAF_AfSIS_SVSLIB
Distribution Liability:

AfSIS follows procedures designed to ensure that data disseminated by AfSIS are of reasonable quality. If, despite these procedures, users encounter apparent errors or misstatements in the data, they should contact AfSIS User Services at +1 845-365-8920 or via email at afsis.info@africasoils.net. Neither AfSIS nor ICRAF verifies or guarantees the accuracy, reliability, or completeness of any data provided. AfSIS provides the data without warranty of any kind whatsoever, either expressed or implied. AfSIS shall not be liable for incidental, consequential, or special damages arising out of the use of any data provided by AfSIS.

Standard Order Process:

Ordering Instructions: The complete merged database containing both soil and spectral data can be accessed from http://www.africasoils.net under the filename ICRAF-ISRIC VNIR Soil Database; also through a link from www.isric.org.

Standard Order Process:

Available Time Period:

Time Period Information:

Single Date/Time:

Calendar Date: 2010

## Metadata Reference Information

Section Index

Metadata Date: 2010/08/19
Metadata Review Date: 2010/08/27
Metadata Future Review Date: 2011/08/27
Metadata Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: Center for International Earth Science Information Network (CIESIN) Metadata Administration

Contact Address:

Address Type: mailing and physical address
Address: CIESIN, Columbia University, P.O. Box 1000, 61 Route 9W
City: Palisades
State or Province: NY
Postal Code: 10964
Country: USA

Contact Voice Telephone: +1 845-365-8988
Contact Facsimile Telephone: +1 845-365-8922
Contact Electronic Mail Address: metadata@ciesin.columbia.edu

Metadata Standard Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata Standard Version: FGDC-STD-001-1998
Metadata Time Convention: local time

GeoMedia Catalog report generated Friday, August 27, 2010