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White mica wavelength position map for Nabesna, Alaska, derived from imaging spectrometer reflectance data

Metadata Updated: October 29, 2023

A map of the wavelength position of the white mica 2,200 nanometer (nm) Al-OH absorption feature was compiled for a region of Nabesna, Alaska, using HyMap™ reflectance data provided and described in this data release. White mica wavelength position was computed for each pixel with spectrally predominant muscovite or illite. The computation was made using a function of the USGS PRISM (Processing Routines in IDL for Spectroscopic Measurements) software (Kokaly, 2011), programmed in Interactive Data Language (IDL; Harris Geospatial Solutions, Broomfield, Colorado). The PRISM function applies linear continuum-removal (Clark and Roush, 1984) to the 2,200 nm feature and fits a parabola to three channels: the channel with the minimum value in continuum-removed reflectance and one channel on either side (Kokaly, 2011). PRISM uses the wavelength position of the axis of symmetry from the fitted parabola as the definition of wavelength value. The white mica wavelength values were output as a classification image, with classes in 1-nm (0.001-micron) increments.

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Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date June 1, 2023
Metadata Updated Date October 29, 2023

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date October 29, 2023
Publisher U.S. Geological Survey
Identifier USGS:5a034814e4b0531197b90083
Data Last Modified 20200929
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id 37da1b1f-dfbe-4c17-bb97-f68f3d89f049
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -143.385752,61.9420478,-140.943323,62.4499567
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash 4e4b246917201391aeae503383207c09e6e56241db4cc1b74fce60c79085e88d
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -143.385752, 61.9420478, -143.385752, 62.4499567, -140.943323, 62.4499567, -140.943323, 61.9420478, -143.385752, 61.9420478}

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