Remotely sensed spectral image data are used to develop a Vegetation Index file which represents spatial variations of actual crop vigor throughout an area that is under cultivation. A pair of tire engaging rollers and a pair of track engaging rollers are supported on the arms. On the basis of the calculated average value and a reference value, a correction value calculating section calculates a correction value for making a mobile station increase a current transmission power so as to become larger than a previous transmission power. Activity indicators may include loading of the Web service object or other states and activities of interest. In particular, low odor and lowno VOC compositions having dual functionality as both acid wash and sanitizing compositions are disclosed.