Technology On Transverse Cutting Profile Of The Three Dimensional Geological Hazard Maps Based On ArcEngine

As an important part of the analysis module in three dimensional geological hazard maps, the function of transverse cutting profile is a powerful tool for analyzing, forecasting and preventing geological disasters. Three dimensional geological hazard maps can clearly reflect the spatial distribution of stratum, disaster bodies and geological structure in the region, coordinated with the two-dimensional profiles cut out from them, which is of great importance for realizing the geological conditions and temporal and spatial distribution where exist various geological bodies and disaster bodies, and directing the prediction and prevention of geological disasters.At present, AutoCAD, MapGIS, Section, South CASS and other application software in geomatics all have the function of transverse cutting profile, but their processes are quite complicated, which need to draw terrain lines, elevation lines, rectangular coordinate lines, stratums' boundaries, fault, ore bodies, exploration projects, patterns filled layer, etc., and finally to achieve the purpose of transverse cutting profile. You don't know how to start the work of transverse cutting profile if you don't know the principle of transverse cutting profile or you are not skilled at the software. And most of the systems depend on borehole data, trenching data, etc., while there is no borehole data and trenching data in geological hazard research, so the former function of transverse cutting profile does not apply.Combined with the circumstances of geological disasters research, and keeping in mind how to simplify the steps of transverse cutting profile and increases the automaticity of the system, and then turns the cumbersome steps into the program background to run automatically, this paper studies the state of the field of transverse cutting profile from two aspects, that is the steps and the data based on. This paper studies the characteristic of the softwares which have the function of transverse cutting profile at home and abroad, and compares their advantages and disadvantages,and then to prove that it is necessary to the develop a new, more suitable function of transverse cutting profile for geological hazard research. This paper focuses on the procedure of creating models and drawing profile maps, and finally turns the cumbersome steps into the program background to run automatically. This paper increases the automaticity of the system as well as achieves the function of transverse cutting profile of the three dimensional geological hazard maps.Based on previous research, this paper analyzes the information of user's needs and geological disasters carefully beginning with the user's needs, including water, stratum and landscape, engineering geological formation complex, structure, stratum attitude, exploration engineering, monitoring station, disaster body and other information, then summarizes the "knowledge rules" of transverse cutting profile of the three dimensional geological hazard maps, and establishes the conceptual models, logical models, calculating data models and drawing data models of transverse cutting profile. In this study, the function of transverse cutting profile bases on those work.The QuantyView platform which developed by China University of Geosciences (Wuhan) Information Research Institute is the cradle of transverse cutting profile which was studied by this paper. This paper proposes the idea and method of transverse cutting profile, taking account of the characteristics of three-dimensional platform, and achieves the function, based on the idea and method and analyzing the characteristics of geological section maps, adopting object-oriented development methodology and the base development platform ArcEngine, using C#. NET languages, GIS technology, analyzing the information of stratum, geological structure data, geological disasters data etc., and establishing the data models of geological section map.The main contents of this thesis:(1) To establish geological database by two types of data management and call method.The first one is to manage data using ArcSDE and Oracle database, the data of all the 60 areas is imported into the Geodatabase, in the oracle database, you can access and manage the data through the ArcSDE uniformly. The second one is to manage data using Access and FileGeodatabase, which mainly make use of the Geodatabase format of the source data, at the same time inherit the layer encoding format of the source data.(2) Analyzing the characteristics of spatial distribution of the stratum, lithology, stratum attitude, collapse, landslides, and other special geological phenomena in the region studied, and abstracting these entities into conceptual models, now therefore summing up the "knowledge rules" of the transverse cutting profile of three dimensional geological hazard maps.(3) Researching how to implement the function of transverse cutting profile of three dimensional geological hazard maps with support from GIS technology, during which involves the rules and algorithm for generating stratums' boundaries and stratums'faces.(4) when the section line drawn across two or more areas,the corresponding profiles still can be cut out,taking into account the integration between this system and other management systems or upstream and downstream software which belong to" Three Gorges Geological Hazard Prediction, Alarming and Commanding System", such as in a web page, enter any two points'geographic coordinates, you can cut out the profile between the two point. After repeated testing, the three-dimensional analysis module of transverse cutting profile has been successfully completed.The main innovation achievements are followed:1. Transverse cutting profile automatically is realized. As long as you draw a section line, the rest of the work is done automatically by the system in the background, not like other software to draw terrain lines, elevation lines, rectangular grid, Cartesian Coordinates, stratums' boundaries etc. step by step.2. The function in the system is applicable to geological hazard research. Other functions like this one in other softwares rely on borehole data, trenching data, etc., while there are not those data in geological hazard prediction and prevention research, and then you can't have the analysis of transverse cutting profile. This paper takes advantage of exploration projects, stratum and landscape, engineering geological formation complex, structure, stratum attitude and disaster to establish correct "knowledge rules" and data models corresponded, and then successfully achieves the function of transverse cutting profile.3. The function of transverse cutting profile of the three dimensional geological hazard maps has stronger universality compared with others. For different regions, as long as there is the data required, the function can be applied, and the corresponding profiles still can be cut out when the section line drawn across two or more areas. While in other softwares, transverse cutting profile can be applied correctly in certain regions or certain drillings, but for other regions or other drillings, correct section drawings can't be automatically cut out.The research achievements of this thesis have been used successfully in the sub-project of "three-dimensional maps' software development and library building about geological hazard". The paper researches and tests taking Yanglaoshan area for example in Three Gorges, which proves that the method is reasonable significantly and its function module has higher popularization value and practical value. At the same time, the paper proves that it is successful to cut section drawings across several maps taking Guojiaba, Guizhouzhen for example, which makes preparations for the integration between the system and other management systems or upstream and downstream software which belong to" Three Gorges Geological Hazard Prediction, Alarming and Commanding System".