This paper describes how to detect change of land with multi-temporal remotely sensed image. The key is how to match images, detect change and confirm the change threshold.

该文在多时相遥感图像中采用主成份差异法提取耕地变化信息，研究的关键在于差值前如何进行图像匹配、如何自动提取变化信息以及差值后如何确定变化阈值。

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The objective of the baseline monitoring work is to detect change in underlying environmental conditions and species populations to act as a warning system against any adverse impacts.

基线监测工作的目的是要监测潜在环境情况和种群的转变，以作为防避所有负面影响的警告系统。

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Wavelet and Fourier analyses are widely used in various fields of image processing. They can be utilized in land use remote sensing dynamic monitoring to detect change information automatically.

小波分析和傅立叶分析被广泛地应用于图像处理的各个领域，它们也能被应用于遥感影像土地利用变化检测。

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Sociologists also detect a distinct change in people's behaviour.

ECONOMIST: Consumer psychology

Nanotechnology, and the emerging field of nanomedicine, is one such solution and promises to change how we detect early stage breast cancer.

FORBES: Breast Exams: Mammography Is Not The Only Game In Town

The trick is to find a way to make this flow rate change when the chemical that the sensor has been designed to detect is present.

ECONOMIST: Medical diagnostics