Fine digital terrain model based road surveying method

The invention discloses a fine digital terrain model based road surveying method, specifically comprising the following steps of: firstly, in the stage of location survey, according to the scale and level of a road surveying and designing item, confirming a source data acquiring mode and a work route, wherein the source data comprise point sets and line set, which are used for building a fine digital terrain model; secondly, cooperatively compiling a road AUTOCAD and the source data to form into a data source; thirdly, building the fine digital terrain model according to the data source; and fourthly, outputting the surveying data which accord with design requirements of specialties in an itemizing way in details. According to the fine digital terrain model, the planning can be quickly carried out, a plurality of schemes can be compared and selected, and each parameter concerned with the survey and design can be quickly queried, so that the huge and complex road surveying and designing work can be greatly simplified; and not only can the road surveying quality be guaranteed, but also the data acquiring work can be furthest simplified, so that the cooperative work of each specialty of the road survey and design can be effectively realized, and the road surveying and designing construction period can be shortened.