Extraction of linear surface features from remote sensing image to construction crop acreage survey sampling frame

Acreage of crops is an important agricultural economic information. In this paper, Using a detailed land use data, constructed sample frame. Ditch planted crops into account the direction,. In support of GIS spatial technology, the survey cost and distribution of natural land, set a reasonable standard of land area. Then under the irregular block size, spatial distribution, the relationship between adjacent blocks are combined into large blocks, large blocks were split into standard land area , so the blocks area are all similar. Using mathematical morphology characteristics of land surface features extracted linear, then establishment of relatively uniform size of the irregular sampling frame. Using random sampling method for study sample experiment.