According to the Range Doppler equations, the geometric calibration of SAR image can be realized using SAR imaging parameters.

依据合成孔径雷达(SAR)距离方程和多普勒方程，用SAR成像参数可实现SAR图像的几何校正。

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First, we regularize the attraction force field in the geometric active contour model to extend the capture range of the object boundaries, and improve the ability of convergence to the concavities.

首先，我们对几何活动轮廊模型中吸引力场进行正则化，扩大目标轮廊边缘对的轮廊曲线的吸引力范围，增加轮廊曲线搜寻凹轮廊的能力。

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Abstract : When using the Range-Doppler model for SAR image geometric correction, the error of satellite orbit, imaging parameter and DEM elevation will affect the geometric correction accuracy.

摘要 ：使用距离多普勒模型进行SAR影象几何校正时，卫星轨道误差、系统成像参数误差和DEM高程的误差会影响几何校正精度。

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First, why do the small-cap indices have a wide range of geometric average market caps?

FORBES: Drawing the Line on Small-cap Stocks