javascript - Using perlin noise to make a map? -

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I have this Perlin noise code, which I picked up on JS Bellal:

As you can see, the image produced is close to the random noise by the noise of the perlin , but why? Production of Perlin noise should not be greater ... Specific areas of 'mountains' and 'valleys' such as: Enter the image </ P> </ div> <p> <div class =

"itemprop =" text ">

Can zoom out too much 

  var height = Perlin nois. Note that I am dividing my x by 10 and not multiply to get something like this: Enter the image details here  
 Updated Bella:  
 In addition, Many Perlin noise has been added to create the effect of many resolution noise in the image you posted

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