Comparison Of Atmospheric Transmittance Measurements In The 3 5 Micrometers And 8 12 Micrometers Spectral Regions With Modtran Consideration For Long Path Geometries
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| Total Pages | : 78 |
| Release | : 1999 |
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Radiance measurements conducted during tropospheric operations to detect objects on the Earth's surface from a manned aircraft or from an unmanned airborne vehicle (UAV) will involve long, near-horizontal viewing geometries. The computer code MODTRAN is widely used for the prediction of the propagation of infrared radiation through the lower atmosphere. This program was undertaken by the IARD to test and validate the predictions of the MODTRAN code for the 3-5 micrometer and 8-l2 micrometer spectral regions under semi-arid desert conditions with well defined meteorological parameters.
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| Release | : 1900 |
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| Total Pages | : 254 |
| Release | : 1999 |
| Genre | : Atmospheric turbulence |
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| Author | : |
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| Total Pages | : 358 |
| Release | : 1998 |
| Genre | : Electrooptical devices |
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This publication contains the papers presented at a specialists' meeting sponsored by the Sensors and Electronics Panel of the RTO. The topics covered included (1) Theoretical and practical aspects of atmospheric propagation under adverse conditions; (2) out-of area operations, variations in weather conditions and propagation phenomena; (3) system optimisation techniques for out-of -area applications; (4) modelling techniques; (5) measurement programmes, including existing collaborations; and (6) applications of dual use technologies for adverse conditions (military / commercial)
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| Release | : 1984 |
| Genre | : Atmospheric radiation |
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This report contains a description and analysis of a series of atmospheric transmittance measurements taken at the Targeting Systems Characterization Facility, Wright-Patterson Air Force Base, Ohio with a circular variable filter (CVF) transmissometer. The data cover the spectral regions from 8- to 12-micron and from 3- to 5-micron for both 8-km and 2.25-km atmospheric paths. The instrumentation is described and comparisons of the data with calculations using the atmospheric transmittance and background radiance code, LOWTRAN 6, are presented. Keywords include: Atmospheric transmittance; Atmospheric optics; Infrared; Attenuation; Absorption; and Aerosols.
| Author | : J. E. A. Selby |
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| Total Pages | : 104 |
| Release | : 1978 |
| Genre | : Aerosols |
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| Author | : National Academies of Sciences, Engineering, and Medicine |
| Publisher | : National Academies Press |
| Total Pages | : 717 |
| Release | : 2019-01-20 |
| Genre | : Science |
| ISBN | : 0309467578 |
We live on a dynamic Earth shaped by both natural processes and the impacts of humans on their environment. It is in our collective interest to observe and understand our planet, and to predict future behavior to the extent possible, in order to effectively manage resources, successfully respond to threats from natural and human-induced environmental change, and capitalize on the opportunities â€" social, economic, security, and more â€" that such knowledge can bring. By continuously monitoring and exploring Earth, developing a deep understanding of its evolving behavior, and characterizing the processes that shape and reshape the environment in which we live, we not only advance knowledge and basic discovery about our planet, but we further develop the foundation upon which benefits to society are built. Thriving on Our Changing Planet presents prioritized science, applications, and observations, along with related strategic and programmatic guidance, to support the U.S. civil space Earth observation program over the coming decade.
| Author | : J. E. A. Selby |
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| Total Pages | : 0 |
| Release | : 1976 |
| Genre | : Aerosols |
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This supplement provides several additions and updates to the LOWTRAN 3 computer code, which can be used to calculate the transmittance of the atmosphere from the ultraviolet to the middle infrared portion of the spectrum (0.25 to 28.5 micrometers) at a spectral resolution of 20 cm. The major additions are the inclusion of water vapor continuum attenuation in the 3.5 to 4.2 micrometers region, and a temperature dependence to the H2O continuum attenuation coefficient in both the 4 micrometers and 10 micrometers regions. The contribution of foreign gas broadening in the 8-14 micrometers region has also been reduced. Four aerosol models are included in this supplement. These include three boundary layer aerosol models for maritime, urban, and rural conditions in the lower 2 km of the atmosphere, and a tropospheric model for use mainly above 1 or 2 km altitude. The rural model is a replacement for the average continental model presently in LOWTRAN 3. A temporary provision is also given to accommodate fog conditions when the visual range falls below 2 km. (Author)
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| Total Pages | : 112 |
| Release | : 1975 |
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A FORTRAN computer program, LOWTRAN 3, is described for calculating the transmittance of the atmosphere in the spectral region from 0.25 to 28.5 micrometers at a spectral resolution of 20/cm. The program provides a choice of six atmospheric models covering seasonal and latitudinal variations from sea level to 100 km, two haze models, and accounts for molecular absorption, molecular scattering, and aerosol extinction. Refraction and earth curvature effects are also included. This program provides some modifications to the molecular absorption and aerosol extinction data provided in an earlier LOWTRAN 2 report. In addition, input modifications have been made, making the LOWTRAN 3 program considerably more flexible in terms of the input of meteorological data.
| Author | : Shunlin Liang |
| Publisher | : Academic Press |
| Total Pages | : 821 |
| Release | : 2012-12-06 |
| Genre | : Science |
| ISBN | : 0123859557 |
Advanced Remote Sensing is an application-based reference that provides a single source of mathematical concepts necessary for remote sensing data gathering and assimilation. It presents state-of-the-art techniques for estimating land surface variables from a variety of data types, including optical sensors such as RADAR and LIDAR. Scientists in a number of different fields including geography, geology, atmospheric science, environmental science, planetary science and ecology will have access to critically-important data extraction techniques and their virtually unlimited applications. While rigorous enough for the most experienced of scientists, the techniques are well designed and integrated, making the book's content intuitive, clearly presented, and practical in its implementation. - Comprehensive overview of various practical methods and algorithms - Detailed description of the principles and procedures of the state-of-the-art algorithms - Real-world case studies open several chapters - More than 500 full-color figures and tables - Edited by top remote sensing experts with contributions from authors across the geosciences
