Download or read book Ground based Cloud Images and Sky Radiances in the Visible and Near Infrared Region from Whole Sky Imager Measurements written by Uwe Feister and published by . This book was released on 2000 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Daylight Visible NIR Whole Sky Imagers for Cloud and Radiance Monitoring in Support of UV Research Programs written by Janet E. Shields and published by . This book was released on 2003 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Whole Sky Imaging of Clouds in the Visible and IR for Starfire Optical Range written by Janet E. Shields and published by . This book was released on 2007 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the work done for the Starfire Optical Range, Kirtland Air Force Base under Contract N00014-01-D-043 DO #11, between 02 September 2004 and 30 April 2006. This work relates to the Air Force's need to characterize the cloud distribution during day and night, for a variety of applications, including support of research into impact of clouds on laser communication and support of satellite tracking. This contract followed Contract N00014-01-D-0043 DO #4, which will be discussed in Section 2, and is documented in Shields et al 2007, Technical Note 271. Under this contract, we began preparing Whole Sky Imager systems for field experiments in support of program goals, adapting the software and refurbishing the hardware. Significant progress was made both in the related cloud algorithms and in methods to assess their accuracy. A related contract was funded through Boeing during 31 January 2005 - 30 November 2005. The tasks completed under that contract are closely related to these tasks, and will also be reported here. In particular, early portions of the night algorithm work reported in Section 7, and early portions of the hardware and software refurbishment were completed partly under the ONR contract and partly under the Boeing contract. The work under this Boeing contract was finished in May 2005. A follow-on contract, ONR N00014-0l-D-0043 DO #13 was funded on 20 April 2006. The work under DO #13 will be reported under a separate report upon completion of the contract.
Download or read book Whole Sky Imagers for Real time Cloud Assessment Cloud free Line of Sight Determinations and Potential Tactical Applications written by Janet E. Shields and published by . This book was released on 2003 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Continuing Support of Cloud Free Line of Sight Determination Including Whole Sky Imaging of Clouds written by Janet E. Shields and published by . This book was released on 2007 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the work done for the Starfire Optical Range, Kirtland Air Force base, under ONR Contract N00014-01-D-0043 DO #13, between 20 April 2006 and 31 July 2007. This work relates to the Air Force's need to characterize the cloud distribution during day and night, for a variety of applications
Download or read book Project Report for Providing Two Day night Whole Sky Imagers and Related Development Work for Starfire Optical Range written by Janet E. Shields and published by . This book was released on 2004 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Enhancement of Near real time Cloud Analysis and Related Analytic Support for Whole Sky Imagers written by Janet E. Shields and published by . This book was released on 2007 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the work done for the Starfire Optical Range, Kirtland Air Force Base under Contract N00014-01-D-043 DO #4, between 25 May 01 and 31 September 06. This work relates to the Air Force s need to characterize the cloud distribution during day and night, for a variety of applications, including support of satellite tracking, and support of research into impact of clouds on laser communication. This contract followed Contract N00014-97-D-0350 DO #6, which will be discussed in Section 2, and is documented in Shields et al 2004b, Technical Note 265. The primary goals of Delivery Order #4 discussed in this current report included further development of day and night cloud algorithms and support of the fielded Whole Sky Imager instruments. Much of the work done under DO #4 was completed by the end of 2004. Some additional work was done in 2005 and 2006 under the DO #4 funding, but most of the SOR work during this interval was done under a follow-on contract, ONR N00014-01-D- 0043 DO #11, funded September 04. The work under DO #11 will be reported under a separate report
Download or read book Renewable Energy Forecasting written by Georges Kariniotakis and published by Woodhead Publishing. This book was released on 2017-09-29 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Renewable Energy Forecasting: From Models to Applications provides an overview of the state-of-the-art of renewable energy forecasting technology and its applications. After an introduction to the principles of meteorology and renewable energy generation, groups of chapters address forecasting models, very short-term forecasting, forecasting of extremes, and longer term forecasting. The final part of the book focuses on important applications of forecasting for power system management and in energy markets. Due to shrinking fossil fuel reserves and concerns about climate change, renewable energy holds an increasing share of the energy mix. Solar, wind, wave, and hydro energy are dependent on highly variable weather conditions, so their increased penetration will lead to strong fluctuations in the power injected into the electricity grid, which needs to be managed. Reliable, high quality forecasts of renewable power generation are therefore essential for the smooth integration of large amounts of solar, wind, wave, and hydropower into the grid as well as for the profitability and effectiveness of such renewable energy projects. Offers comprehensive coverage of wind, solar, wave, and hydropower forecasting in one convenient volume Addresses a topic that is growing in importance, given the increasing penetration of renewable energy in many countries Reviews state-of-the-science techniques for renewable energy forecasting Contains chapters on operational applications
Download or read book Meteorologische Zeitschrift written by and published by . This book was released on 2005 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Improved Cloud Detection Utilizing Defense Meteorological Satellite Program Near Infrared Measurements written by James T. Bunting and published by . This book was released on 1982 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Fascat Model Performance Under Fractional Cloud Conditions and Related Studies written by Richard W. Johnson and published by . This book was released on 1984 with total page 1174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Automated Whole Sky Imagers for Day and Night Cloud Field Assessment written by and published by . This book was released on 1993 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book DSCOVR EPIC NISTAR 5 years of observing earth from the first lagrangian point written by Alexei Lyapustin and published by Frontiers Media SA. This book was released on 2022-12-12 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spectral Radiance of Snow and Clouds in the Near Infrared Spectral Region written by Francis R. Valovcin and published by . This book was released on 1978 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: The near infrared spectral radiance measurements of snow and cirrus and cumulus cloud backgrounds taken by the Air Force Geophysics Laboratory's flying laboratory are evaluated. From the analysis of the 124 specra obtained, the spectral radiances or reflectance characteristics of snow and cirrus and cumulus clouds between 5500 and 7000/cm (1.82-1.43 micrometers were determined. Snow/cloud discrimination can be made by utilizing a sensor in the 5500 to 7000/ cm spectral region. Based on the analysis of these data, certain snow/cloud design parameters were identified; that is, slope of the spectral radiance, absolute spectral and/or total radiance, and the location and value of the maximum spectral radiance for the snow and cirrus and cumulus cloud backgrounds. Finally, specific recommendations are made for an optimal operational snow/cloud discrimination radiometer. (Author).
Download or read book Remote Sensing of Clouds for Solar Forecasting Applications written by Felipe Alejandro Mejia and published by . This book was released on 2017 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method for retrieving cloud optical depth ( [tau] c ) using a UCSD developed ground-based Sky Imager (USI) is presented. The Radiance Red-Blue Ratio (RRBR) method is motivated from the analysis of simulated images of various [tau] c produced by a Radiative Transfer Model (RTM). From these images the basic parameters affecting the radiance and RBR of a pixel are identified as the solar zenith angle (SZA), [tau] c , solar pixel angle/scattering angle (SPA), and pixel zenith angle/view angle (PZA). The effects of these parameters are described and the functions for radiance, I [lambda] ([tau] c ,SZA,SPA,PZA) , and the red-blue ratio, RBR([tau] c ,SZA,SPA,PZA) , are retrieved from the RTM results. RBR, which is commonly used for cloud detection in sky images, provides non-unique solutions for [tau] c , where RBR increases with [tau] c up to about [tau] c = 1 (depending on other parameters) and then decreases. Therefore, the RRBR algorithm uses the measured I meas [lambda] (SPA,PZA) , in addition to RBR meas (SPA,PZA) to obtain a unique solution for [tau] c . The RRBR method is applied to images of liquid water clouds taken by a USI at the Oklahoma Atmospheric Radiation Measurement program (ARM) site over the course of 220 days and compared against measurements from a microwave radiometer (MWR) and output from the Min [ MH96a ] method for overcast skies. [tau] c values ranged from 0-80 with values over 80 being capped and registered as 80. A [tau] c RMSE of 2.5 between the Min method [ MH96b ] and the USI are observed. The MWR and USI have an RMSE of 2.2 which is well within the uncertainty of the MWR. The procedure developed here provides a foundation to test and develop other cloud detection algorithms. Using the RRBR [tau] c estimate as an input we then explore the potential of using tomographic techniques for 3-D cloud reconstruction. The Algebraic Reconstruction Technique (ART) is applied to optical depth maps from sky images to reconstruct 3-D cloud extinction coefficients. Reconstruction accuracy is explored for different products, including surface irradiance, extinction coefficients and Liquid Water Path, as a function of the number of available sky imagers (SIs) and setup distance. Increasing the number of cameras improves the accuracy of the 3-D reconstruction: For surface irradiance, the error decreases significantly up to four imagers at which point the improvements become marginal while k error continues to decrease with more cameras. The ideal distance between imagers was also explored: For a cloud height of 1 km, increasing distance up to 3 km (the domain length) improved the 3-D reconstruction for surface irradiance, while k error continued to decrease with increasing decrease. An iterative reconstruction technique was also used to improve the results of the ART by minimizing the error between input images and reconstructed simulations. For the best case of a nine imager deployment, the ART and iterative method resulted in 53.4% and 33.6% mean average error (MAE) for the extinction coefficients, respectively. The tomographic methods were then tested on real world test cases in the University of California San Diego's (UCSD) solar testbed. Five UCSD sky imagers (USI) were installed across the testbed based on the best performing distances in simulations. Topographic obstruction is explored as a source of error by analyzing the increased error with obstruction in the field of view of the horizon. As more of the horizon is obstructed the error increases. If at least a field of view of 70° is available for the camera the accuracy is within 2% of the full field of view. Errors caused by stray light are also explored by removing the circumsolar region from images and comparing the cloud reconstruction to a full image. Removing less than 30% of the circumsolar region image and GHI errors were within 0.2% of the full image while errors in k increased 1%. Removing more than 30° around the sun resulted in inaccurate cloud reconstruction. Using four of the five USI a 3D cloud is reconstructed and compared to the fifth camera. The image of the fifth camera (excluded from the reconstruction) was then simulated and found to have a 22.9% error compared to the ground truth.
Download or read book Scientific Report on Whole Sky Imager Characterization of Sky Obscuration by Clouds for the Starfire Optical Range written by Janet E. Shields and published by . This book was released on 2010 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
