Irradiance and radiance caching are important algorithms for solving the light transport problem in realistic image synthesis. ey both require geometric search data structures for efficient rendering. Our goal was to improve the caching algorithms by improving these data structures. We have implemented 6 different data structures for irradiance caching, 2 previously used and 4 newly adapted to...

The Atmospheric Emitted Radiance Interferometer (AERI) measures downwelling infrared radiance from 550-3000 cm (18.2 – 3.3 μm) at high-spectral-resolution (~ 1 cm) (Knuteson et al. 2004). The original temporal sampling strategy (a 3-min average of sky radiance every 8 min) was chosen to optimize the signal-to-noise in the observations for clear sky applications. Clear-sky AERI observations have...

A field campaign for the vicarious calibration of the instruments ADEOS/AVNIR (Advanced Earth Observing Satellite/Advanced Visible and Near-Infrared Radiometer) and the visible to near-infrared channels of the Ocean Color and Temperature Scanner (OCTS) was conducted based on the reflectance-based method. The results show a not so small difference between the estimated top of atmosphere (ToA) ra...

This paper examines the feasibility of implementing core algorithms from Radiance using a new type ray tracing engine optimized for highly parallel graphics hardware environments. It presents solutions to a number of implementation challenges. First, the Radiance data format is reinterpreted as a set of buffered data arrays compatible with graphics processing unit (GPU) memory. Second, the ray ...

This paper applies plane parallel radiance transport techniques to scattering from vegetation. The leaves, stems, and branches are represented as a volume density of scattering surfaces, depending only on height and the vertical component of the surface normal. Ordinary differential equations are written for the multiply scattered radiance as a function of the height above the ground, with the ...

The comparison of recalibrated spectra from the atmospheric emitted radiance interferometer prototype (AERI-00) and lineby-line radiative transfer model (LBLRTM) calculations show much smaller differences in the 800-1200 cm atmospheric -1 window region under “clear conditions” compared with the preliminary calibrated data. Results indicate that the new AERI-00 data is in good agreement with sim...

The stability of radiance measurements taken by the Sky Quality Meter (SQM)was tested under rapidly changing temperature conditions during exposure to a stable light field in the laboratory. The reported radiance was found to be negatively correlated with temperature, but remained within 7% of the initial reported radiance over a temperature range of -15 °C to 35 °C, and during temperature chan...

The long-term goal of “Radiance in a Dynamic Ocean (RaDyO): Radiance and Visibility as Affected by Inherent Optical Properties” is to perform detailed investigations of inherent optical properties (IOPs) and the effects of IOP variability on underwater radiance and visibility. As part of this effort, Sea Engineering, Inc. (SEI) will also provide all data from the Scripps Pier and Santa Barbara ...

Page Chapter 1 Introduction 1 Chapter 2 Estimating forest variables from top-of-atmosphere 15 radiance satellite measurements using coupled radiative transfer models Chapter 3 Inversion of a coupled canopy-atmosphere model using 37 multi-angular top-of-atmosphere radiance data: A forest case study Chapter 4 A Bayesian object-based approach for estimating 59 vegetation biophysical and biochemica...

Normal mapping is a variant of bump mapping that is commonly used in computer games. It models complex surface variations by explicitly storing a surface normal in a texture map. However, it has not been used with precomputed radiance transfer (PRT), a technique for modeling an object’s response to a parameterized model of lighting, which enables interactive rendering of complex global illumina...