Sampling survey to the total area of the forest of Heshun county in Shanxi province in year 2000 |
Description: |
We need to take some samples from 2,697,460 image units to investigate (the minimum investigated unit is a TM image) the area of forest coverage of Heshun county in Shanxi province in year 2000, require that presampling 20 samples before formally sampling, the presampling variance is 5000m2. According to the previous investigated results, the variance of the forest area of a TM image is 55m2. |
Sampling method: |
Systematic sampling |
Objective: |
To estimate the forest area of Heshun county in year 2000 by sampling |
Condition: |
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Request: |
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