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GPS in the grain plots to forestry (grass) engineering application In 2001, the state forestry administration promulgated for implementation the state forestry administration on afforestation quality accidents of administrative responsibility system of regulations, afforestation quality accidents of 3 standards, the foundation of a content is ZaoLinDe area, at the same time, the provisions on the quantity and quality of the false forestation project legal person, unit and the legal representative, the person-in-charge directly responsible and other personnel directly responsible shall be given administrative sanctions according to law. In addition, intensivism from the grain plots to forestry (grass) engineering in recent years, the afforestation in each check and accept, acceptance of the key is one of the most important content is the area ZaoLinDe verification issues. Therefore, in the forestry market practice correctly to measure is the basis of all forestation practice. 1 the GPS navigators profile GPS Positioning System is Global, namely the Global Positioning System, it is the space station, by users and the three parts. According to the users work, the influence of regional satellite state of the satellite distribution situation, GPS positioning precision machine, namely 15m less than hm2 0.023 area. GPS positioning error mainly comes from star alex error, satellite receiver error distribution and the three parts, in the correct orientation, under the situation of the error in LuoPanYi with far less node board quadrature instrument error of calculating area. 2 the current situation in huzhu In the forestry production practice needs a lot of work, as measured ZaoLinDe investigation and survey, forest road.based etc, involves the measurement technology and content is very wide. But the current situation in huzhu measurement, one is to measure the work, such as in the grain plots to forestry (grass) engineering afforestation design process, scientific and