Application of GPS in Jiaonan Geographical Information System Engineer
Wang De · 2004
During the period of establishing third grade plane controlling net and elevation fitting work by using GPS, plane precision and elevation fitting precision are promoted. It is proved that precision test of measuring point in plane net should be carried out and short reference line with low precision in three-dimensional un-forbidding adjusting error should be kept. As to elevation fitting, many methods should be used to test all precision in already known GPS level mark. At the same time, precision of fitting elevation of measured spots are tested. Regarding average value of fitting elevation of measured spots as most probable error, errors, smallest and biggest values of fitting elevation are measured, and regarding all precision testing results, the best fitting plan is chosed.