遥感基础实习 - 图文(2)

1. Draw a diagram showing the path of light from the sun to the earth, and the reflected path from the earth to the satellite. Label all of the

places/processes in this diagram that affect how much light (radiance) is received at the satellite. （画一个草图来表示太阳光到地球并从地球反射到卫星的过程，并标明影响光线传输到卫星的每个过程的名称，可以用画图工具完成后插入到word中）

2. Fill in the following table:

Image File Data Type （数据类型） 整型 Band 3 Data Range （第三个波段的数值范围） 0-255 Band 4 Data Range （第四个波段的数值范围） 0-255 Original DN Value 原始DN值 Radiance (calculated) 辐射率 Reflectance (calculated) 反射率

浮点型 0.000000-264.000000 0.000000-220.999985 浮点型 0.000000-0.648785 0.000000-0.809136 3. What is the % reflectance in the Near Infrared band of the pixels that occupies Row 727 and Column 5090, Row 2937 and Column 521? （using pixel locator to locate the position） （第727行、5090列和第2937行、521列像素在近红外波段的反射率各是多少？各像素分别为何地

物？是否于其光谱曲线符合？）（提示利用image窗口中，tools下的pixel locator来确定像素的位置，注意列在前，行在后）

0.039374 0.321701；水库、云；符合 不符合

Worksheet: Lab 03: Exploring Digital Data

1. Which bands do you assign to blue, green, and red primary colors,

respectively, to display a true color image (what your eye would see)? （合成

真彩色影像）

When you assign band 6 to red, band 3 to green and band 2 to blue, what does vegetation look like in the resulting image? What does this tell you about vegetation reflectance? （6,3,2分别赋给R,G,B，合成影像，其植被的颜色是什么？）

Draw a line from your ROI ascii file here for pixels of water, vegetation, building, road and bare soil respectively. 利用excel绘制水体、植被、建筑、道路和裸地的光谱曲线，插入到本题后。

2.

Does this reflectance curve resemble the shape of the typical vegetation

reflectance curve? （植被的光谱是否符合理论上所学的植被的光谱？） 符合，在红外近红外效果明显

3. Draw spectral profiles (just reproduce the general shape) below for

vegetation, Tiananmen Square and water pixels from the TM image. For each, state whether you think the pixel is “pure” or do you think it contains a mixture of materials. Explain your answers. （利用ENVI工具制作植被、天安门广场和水体的光谱曲线。对于每一个曲线，请考虑其是纯像元还是混合像元，为什么？）

水体，纯相元，在同一像素内部存在其他地物

天安门，

植被，混合相元，同一像素内有多种地物