Natural-Color-Image Map of Quadrangles 3772, 3774, 3672, and 3674, Gaz-Khan (313), Sarhad (314), Kol-I-Chaqmaqtin (315), Khandud
(319), Deh-Ghulaman (320), and Ertfah (321) Quadrangles, Afghanistan
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Dataset Identification:
Resource Abstract:
This map is a natural-color rendition created from Landsat 7 Enhanced Thematic Mapper Plus imagery collected between 1999
and 2002. The natural colors were generated using calibrated red-, green-, and blue-wavelength Landsat image data, which were
correlated with red, green, and blue values of corresponding picture elements in MODIS (Moderate Resolution Imaging Spectrometer)
'true color' mosaics of Afghanistan. These mosaics have been published on http://www.truecolorearth.com and modified to match
more closely the Munsell colors of sampled surfaces. Peak elevations are derived from Shuttle Radar Topography Mission (SRTM)
digital data, averaged over a pixel representing an area of 85 m2, and they are slightly lower than the highest corresponding
local point. Cultural data were extracted from files downloaded from the Afghanistan Information Management Service (AIMS)
Web site (http://www.aims.org.af). The AIMS files were originally derived from maps produced by the Afghanistan Geodesy and
Cartography Head Office (AGCHO). Cultural features were not derived from the Landsat base and consequently do not match it
precisely. This map is part of a series that includes a geologic map, a topographic map, a Landsat natural-color-image map,
and a Landsat false-color-image map for the USGS/AGS (U.S. Geological Survey/Afghan Geological Survey) quadrangles covering
Afghanistan. The maps for any given quadrangle have the same open-file report (OFR) number but a different letter suffix,
namely, -A, -B, -C, and -D for the geologic, topographic, Landsat natural-color, and Landsat false-color maps, respectively.
The OFR numbers range in sequence from 1092 to 1123. The present map series is to be followed by a second series, in which
the geology is reinterpreted on the basis of analysis of remote-sensing data, limited fieldwork, and library research. The
second series is to be produced by the USGS in cooperation with the AGS and AGCHO.
Citation
Title Natural-Color-Image Map of Quadrangles 3772, 3774, 3672, and 3674, Gaz-Khan (313), Sarhad (314), Kol-I-Chaqmaqtin (315), Khandud
(319), Deh-Ghulaman (320), and Ertfah (321) Quadrangles, Afghanistan