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KMID : 1024519960050020103
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Journal of the Environmental Sciences
1996 Volume.5 No. 2 p.103 ~ p.112
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Sampling Study on Environmental Observations: Precipitation, Soil Moisture and Land Cover Information
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Yoo Chul-Sang
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Abstract
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Observational date is integral in our understanding of present climate, its natural variability and any cnange roue to anturopogenic effects. This study incorporates a brief overview of sampling requirements using data from the first ISLSCP Field Experiment (FIFE) in 1987, which was a multi-disciplinary field experiment over a 15km grid in Konza Prairie, USA. Sampling strategies were designed for precipitation and soil moisture measurements and also detecting land cover type. It was concludes that up to 8 raingages would be needed for valuable precipitation measurements covering the whole FIFE catchment, but only one soil moisture station. Results show that as new gages or station are added to the catchment then the sampling error is reduced, but the Improvement in error performance is less as the number of gages or stations increases. Sampling from remoteiy sensed instruments shows different results. It can be seen that the sampling error at 1arger resolution sizes are small due to competing error contribution from both commission and omission error.
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KEYWORD
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Sampling, sampling error, precipitation, soil moisture, land cover
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