Implementation steps and correlative calculation
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Estimate the total forest area of this county in year 2000 according to the forest area of 112 raster units of TM image of Heshun county in Shanxi province
 

 
Implementation steps:
 
  1. Calculate the mean of 112 sample pixels, then multiply 2,697,460, the result is the estimated total area;
  2. Estimate the population variance by sample data, estimate the sampling accuracy by population variance and sample size.
 

Calculate:

  1. Estimate the total forest area of Heshun county:

    2.  

  2. Sample variance:

  3. Sampling accuracy:

    4.  
Note: S tandard deviation of the forest area in pixel ； Confidence level ; All the image pixel size N in the re search areas; Sample value； Sample mean.
 
 
 
 
 
 
 
 
 
 

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