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Data Series 787

USGS Afghanistan Project Product No. 186

Surface Mineral Maps of Afghanistan Derived from HyMap Imaging Spectrometer Data, Version 2

By Raymond F. Kokaly, Trude V.V. King, and Todd M. Hoefen

Thumbnail of and link to report PDF (14 MB)Abstract

This report presents a new version of surface mineral maps derived from HyMap imaging spectrometer data collected over Afghanistan in the fall of 2007. This report also describes the processing steps applied to the imaging spectrometer data. The 218 individual flight lines composing the Afghanistan dataset, covering more than 438,000 square kilometers, were georeferenced to a mosaic of orthorectified Landsat images. The HyMap data were converted from radiance to reflectance using a radiative transfer program in combination with ground-calibration sites and a network of cross-cutting calibration flight lines. The U.S. Geological Survey Material Identification and Characterization Algorithm (MICA) was used to generate two thematic maps of surface minerals: a map of iron-bearing minerals and other materials, which have their primary absorption features at the shorter wavelengths of the reflected solar wavelength range, and a map of carbonates, phyllosilicates, sulfates, altered minerals, and other materials, which have their primary absorption features at the longer wavelengths of the reflected solar wavelength range. In contrast to the original version, version 2 of these maps is provided at full resolution of 23-meter pixel size. The thematic maps, MICA summary images, and the material fit and depth images are distributed in digital files linked to this report, in a format readable by remote sensing software and Geographic Information Systems (GIS). The digital files can be downloaded from https://pubs.usgs.gov/ds/787/downloads/.

First posted September 11, 2013

For additional information contact:
Raymond Kokaly
U.S. Geological Survey
Box 25046, Mail Stop 964
Denver, CO 80225
raymond@usgs.gov

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Suggested citation:

Kokaly, R.F., King, T.V.V., and Hoefen, T.M., 2013, Surface mineral maps of Afghanistan derived from HyMap imaging spectrometer data, version 2: U.S. Geological Survey Data Series 787, 29 p., https://pubs.usgs.gov/ds/787/.



Contents

Abstract

Introduction

Purpose and Scope

Methodology

Thematic Maps of Surface Minerals

Summary

Acknowledgments

References Cited


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