Remote sensing satellite image data 遥感卫星影像数据
In the study, the authors used the MODIS satellite image data and the thermal inertia method to analyze the permafrost on the northeastern Qinghai-Tibet Plateau.
研究中利用MODIS卫星图像的数据，借助热惯量方法对青藏高原东北部的多年冻土进行了分析。
Free images can also be old and if countries want a certain image it may well be outside the remit of free data access, so they have to pay for a satellite to take it.
免费的图像也可能是陈旧的，如果各国想要某些特定的图像，它很可能在免费数据获取的范围之外，因此它们不得不付费让卫星拍摄这样的图像。
The gray circle at the center of each image is the "pole hole," north of which satellite sensors have historically been unable to collect data.
每幅图中心位置的灰色圆圈是“极点”，卫星从来都无法在极点以北收集数据。
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