With the rapid development of economy and society, both national roads and urban roads have the characteristics of fast infrastructure construction and renewal, high traffic pressure and low degree of informatization, which cannot meet the digital requirements of modern road traffic system. It is urgent to build a convenient, efficient and real-time traffic geographic information system.
Based on the development environment of ArcGISEngine, this paper briefly expounds the road traffic information system and ArcEngine component platform, and according to the relevant principles of software design, designs the overall design and functional modules of the road traffic geographic information system.
Keywords: ArcGIS engine; Road traffic geographic information system; Component development
At present, with the rapid growth of domestic economy and the increasing scale of urbanization, the road traffic pressure represented by the number of motor vehicles is increasing day by day. China's big cities, such as Beijing, Shanghai and Tianjin, reduce road load by limiting the number.
Modern information technology provides data support for integrating road traffic resources and realizing automatic management and control of traffic data, which is conducive to building a spatio-temporal integrated road traffic geographic information system.
1. Road Traffic Geographic Information System
As an embedded secondary development platform of GIS, ArcGISEngine can get rid of the component-based multi-type development application interface API provided by ArcGIS, and at the same time, it can be integrated with the MicrosoftVisualStu-dio system programming integrated development environment to carry out modular development of multi-type programming languages based on MicrosoftVisualStu.
Based on GIS geographic information technology, using ArcGISEn-gine platform, the spatial information of traffic network, road facilities, vehicle traffic, infrastructure, etc. is effectively connected with aerial photography and multimedia monitoring data, so as to realize the collection, editing and analysis of spatial and attribute data, optimize and select reasonable traffic routes by using GIS shortest path and road unblocked algorithm, complete bus routing and station layout, integrate multimedia monitoring means, display hot road information in real time, and scientifically direct road traffic.
2. Analysis of system functional requirements
From the application level, the audience of road traffic geographic information system is divided into traffic management and vehicle application client. The application system based on ArcGISEngine discussed in this paper is mainly the C/S client of traffic management, and the specific vehicle client can use APP software based on Android, ios or WindowsMobile platform. From the principle analysis of system design, we should adhere to the principles of safety, fun, expansibility and maintainability to improve the comprehensive development of road traffic geographic information system.
As a road traffic geographic information system, based on digital road space and attribute information, it provides map measurement, spatial roaming, data maintenance and other functions. Under the condition of ensuring different user rights of the system, the relevant locations of hotels, schools, shopping malls, enterprises and institutions are retrieved, and according to the traffic flow and density data of hotspots monitored by cameras, with the help of GPS positioning and wireless data transmission technology, location-related services are provided for public transport vehicles such as buses and taxis.
3. Overall and functional module design of road traffic geographic information system.
Before the design of road traffic geographic information system, spatial image data, basic line drawing and special traffic data are collected according to the corresponding data standards, and the data are standardized and preprocessed through the processes of cutting, mosaic and calibration, and the data are imported into the spatial basic database of the system platform, and the information of parking lots, bus stops, expressways, railways and highways is refined according to points, lines and areas. The spatial geography basic database is layered as follows:
(1) System sub-databases: geodetic control survey database, digital elevation DEM and orthophoto DOM database, digital line drawing DLG and remote sensing grid DRG database, and system meta-database.
(2) System logical hierarchical database: taking DLG database as an example, it can be divided into hierarchical element information of residential areas, water systems, roads, vegetation, topography and other databases.
(3) System logic bottom: including points, lines, surfaces, notes, multimedia layers and other related information.
According to the application framework of road traffic geographic information system, its overall design can be divided into three parts: electronic map service module, public information service module, spatial analysis and data statistics module.
GeoDatabase, the system spatial database, imports related spatial data and attribute files such as shapes, grids and attribute tables, and the management client uses the local coordinate system to register and build, which is convenient for the later updating and maintenance of traffic facilities data. For the public information service module, the decrypted electronic map and remote sensing data are used to ensure the safety of the data spatial location.
The specific functional modules of the system are designed as follows:
(1) electronic map service module.
Using ArcGISEngine map toolset components, functions such as layer control, hotspot annotation and spatial measurement can be easily realized on VS development platform, and data formats such as ArcInfo, Shapefile and GRID can be loaded and edited.
(2) Public information service module: focusing on providing spatial location retrieval and location-based information service functions. Using the class library resources of ArcGISEngine, the retrieval function of related map data is completed through ToolbarControl and DataGridView, and controls are searched in VS system to query the attribute information of elements.
(3) Spatial analysis and data statistics module: The elements retrieved from the spatial data in the road traffic geographic information system can be used for corresponding cluster analysis or numerical statistics; Regarding the spatial analysis function, it mainly involves shortest path analysis and buffer analysis. According to the change of traffic demand and circulation, calculate the shortest distance and shortest time or identify the influence interval of related geographical entities on surrounding elements, and part of the code is realized by spatial buffer analysis.
4. Conclusion
As a road traffic geographic information system which includes surveying and mapping information collection and processing, computer software programming and database construction, based on ArcGISEngine component development platform, the related service functions of the system are defined, and the overall framework of the system is constructed, which provides a reference for similar engineering practice.
References:
[1] Liu Ying. Research on the Development and Application of ArcGISEngine [J]. Urban Survey, 2006 (02).
[2] Zhang Guoqiang. Application of Digital Image Processing Technology in Traffic Monitoring [J]. Journal of Liaoning Normal University (Natural Science Edition), 2007(04).
Tan, Zou Xiaomei. Research on Traffic Accident Information System Based on GIS [J]. Shanxi Science and Technology, 2007(0 1).
[4] Li Hong, Shen Dong. Design and Implementation of Geographic Information Database Based on ArcGlSEngine [J]. Surveying and Mapping and Spatial Geographic Information, 2009(04).
Blue, Wang Fei,. Design and Implementation of Query Information System Based on ArcGISEngine [J]. Metal Mine, 2008(02).
2. Inquiry teaching is a teaching mode that attaches importance to improving students' ability to find, analyze and solve problems, and its teaching concept is consistent with the new curriculum reform concept in China.
Through the analysis of inquiry teaching of geography in senior high school, this paper summarizes the experience of inquiry teaching, summarizes the experience for inquiry teaching of geography application in senior high school, improves the effect of geography classroom teaching, improves the efficiency of classroom teaching and promotes the all-round development of students' quality.
Keywords: high school geography; Inquiry teaching; New curriculum concept
Under the influence of traditional teaching mode, geography teaching in senior high school only pays attention to students' achievements and ignores the improvement of students' comprehensive ability.
The new curriculum reform requires students to master textbook knowledge and improve their comprehensive quality in classroom teaching.
In classroom teaching, teachers need to change the status of teachers and students, so that students can become the main body of the classroom and actively participate in classroom learning.
Inquiry teaching mode belongs to the teaching mode of cultivating students' initiative and conforms to the concept of new curriculum reform in China.
Therefore, geography teachers in senior high schools need to attach importance to the application of inquiry teaching mode, and improve students' active inquiry ability and scientific literacy in the process of inquiry teaching, which plays an important role in students' learning geography knowledge and future growth [1].
Based on my own teaching experience, the author briefly analyzes the application of inquiry teaching in geography teaching in senior high school.
1, the orientation of teachers and students in inquiry teaching
1. 1 student-oriented: inquiry teaching, as a teaching method to cultivate students' independent inquiry ability, requires every student to actively participate in teaching activities.
At the same time, inquiry teaching requires students to carry out inquiry learning under the guidance of teachers, sum up knowledge through personal observation, analysis and research activities or behaviors, and build a knowledge system, instead of teachers imparting knowledge to students through indoctrination.