Student Internship Program Report Page: 5 of 6
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Technical
The data generated by various proposed remote sensing
instruments is in the form of a hyperspectral cube, which is a spatially 2-
dimensional image where and each pixel consists of a full spectrum
(sampled contiguously). The result is a 3-dimensional image. A 'push-
broom' type instrument that images one spatial pixel line at a time
produces this image (similar to a scanner or copier). While a typical
push-broom device images each spatial line with a single line of pixel
elements, the hyperspectral device smears the image spectrally with a
diffraction grating and then images with 2-dimensional pixel element
array instead. Thus each spatial line becomes a 2-dimensional image
with spectral data, and these are stacked together to produce a
hyperspectral image. The desired Khoros program will take this image
and add noise dependent on atmospheric transmission, sensor
specifications, and electronics' characteristics.
The Khoros environment is a suite of programs arranged in a
predictable architecture and the ability to handle a wide variety of image
types. The default data operators and image viewers can handle images
that fit within the description of the "polymorhic data model." This can
include location, time, 'value' (e.g. gray-level), 'mask' (marks validity of
specific pixels; in my case this could mark water-absorption regions of
the spectrum as 'bad'), and 'map' data (e.g. mapping a 256 'value' range
to an RGB map of 256 colors). The various operators can, therefore,
easily handle a hyperspectral image cube. The predictable architecture
bundles the programs together in 'toolboxes' that allow for the easy
addition of functionality by linking programs together. Programs are
written in the C language.
Chronology
When I first arrived this summer, the nature of my tasks for the
next 2 % months were yet to be determined. On my second day working
at Sandia, I attended a meeting of the various engineers who were
shaping this program. At this point the technical specifics of the remote
sensing device were being debated and the goals of the project were in
question, and it was eventually decided that more research would need
to be done into what type of system would perform best. I eventually
became involved in an effort to model the noise of such systems, an
important step for the continued development of a requisite sensor.
Since then, I've spent the majority of my time learning the basics of
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CASSIDY,TIMOTHY A. Student Internship Program Report, article, August 4, 2000; Albuquerque, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc717964/m1/5/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.