projection()
Returns the default projection of an Image. Throws an error if the bands of the image don't all have the same projection.
代码语言：javascript复制返回图像的默认投影。如果图像的条带不都具有相同的投影，则会引发错误。Arguments:
this:image (Image):
The image from which to get the projection.
Returns: Projection
这是我通过打印获得到当前影像投影
crs:EPSG:32610这个就代表坐标系，具体参数可以去百度就能知道名称
第二个要介绍的：
nominalScale()
Returns the linear scale in meters of the units of this projection, as measured at the point of true scale.这个就是告诉你他的名义分辨率是多少，也就是影像的分辨率这里Landsat8是30米
Arguments:
this:proj (Projection)
Returns: Float
第三个方法：
bandNames()
Returns a list containing the names of the bands of an image.
代码语言：javascript复制返回一个包含图像波段名称的列表。Arguments:
this:image (Image):
The image from which to get band names.
Returns: List
代码：
代码语言：javascript复制var image = ee.Image('LANDSAT/LC8_L1T/LC80440342014077LGN00')
.select(['B2', 'B3', 'B4', 'B5', 'B6', 'B7', 'B10', 'B11']);
var scale = image.projection().nominalScale();
var bandNames = image.bandNames();
print("scale",scale)
print("bandNames",bandNames)
