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首页> 外文会议>International conference on remote sensing for marine and coastal environments >ESTIMATING GRAVITY WAVE SPECTRA FROM IR IMAGES
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ESTIMATING GRAVITY WAVE SPECTRA FROM IR IMAGES

机译：估算IR图像的重力波谱

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Previous studies have shown that ocean wave spectra can be derived from optical images of the ocean surface (Barber 1949, Stilwell 1969). We estimate ocean gravity wave spectra from a hyperspectral image taken with the JPL AVIRIS (Airborne Visible/Infrared Imaging Spectrometer) instrument. A single wavelength band in the near infrared was used to minimize the effects of the atmosphere. A model is developed relating the surface-reflected radiance to the surface slope using a Cox and Munk (1954) type model that includes the effects of ocean swell. The large-scale (swell generated) and the small-scale (wind-generated) slope components are additive and it is assumed that the small-scale slopes are normally distributed. In this model, the large-scale slope dictates the mean about which the small-scale slopes are oriented. A calibrated radiance to waveheight transfer function is developed which depends on the geometry, the surface reflectance, the local surface roughness and the atmospheric transmittance. The surface roughness is approximated using the original Cox and Munk model. The transfer function is used to calculate waveheight spectral densities via a two-dimensional Fourier Transform. The waveheight spectrum is then compared to buoy measurements taken in or near the region at the time of the observation.
机译：以前的研究表明，海浪谱可以源自海面的光学图像（理发1949，Stillwell 1969）。我们从JPL Aviris（空气中可见/红外成像光谱仪）仪器拍摄的高光谱图像中估计海洋重力波谱。近红外线中的单个波长带用于最小化大气的影响。使用COX和MUNK（1954）型模型开发了一种与表面反射到表面斜面的模型，其中包括海洋膨胀的效果。大规模（膨胀）和小尺寸（风产生）斜率部件是附加的，并且假设小尺寸斜率通常分布。在该模型中，大规模斜率决定了小尺寸斜坡面向的平均值。开发了校准的波浪传递函数，这取决于几何形状，表面反射率，局部表面粗糙度和大气透射率。使用原始COX和MUNK模型近似表面粗糙度。传递函数用于通过二维傅里叶变换计算波浪光谱密度。然后将波浪光谱进行比较，而在观察时在区域中或附近的浮标测量。

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