Hi,
    I want to generate contours with different intervals in sevaral elevation 
ranges. For example, if the elevation range is (0,100), the contour interval is 
10; if the range is [100, 500), the interval is 50; and if the range is [500, 
2000), the interval is 200. Can all those contour generation  be processed in 
one time. by gdal_contour? What should I do if it cannot? By the way, I do not 
know the meaning of  the "fixed level" in the process of the contour 
generation, would someone give me some advices? 
  ------------------
  To the world you're little, but to a person, maybe you're the world.
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