Effect comparison of the volume from the volume with chamlong from neighboring areas in measuring between 22 March 28-2557 (2014) (case 2) by comparing the NEF and Ldn noise levels between the value from measuring the actual volume with a volume from a forecast using the JavaScript try INM 7.0 c found that there are different values for volume by volume, from using the most precious chamlong ta than actual measurement. The cause may be due to the origin of the imported audio-only sound will be chamlong origin from the plane, which is in fact the origin of sound in measuring sound level station area may come from other activities that occurred in the vicinity, such as traffic and activities in the community. There are also other major factors that cause volume from chamlong and the volume of the actual measuring values are different:
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