abstract

Impact of Gravity Field Model on Reduced-dynamic Orbit Determination for Swarm SatellitesbyWANG Zhengtao

AbstractCombining space-borne GPS data and reduced-dynamic models, and introducing optimized pseudo-stochastic pulses into deterministic motion equations, the precise orbit determination for Swarm was processed based on reduced-dynamic method. And then,the efects on orbit accuracy from diferent gravity models (e.g. JGM3, EGM96, EGM2008 and EIGEN-6C4) were analyzed in detail. The results indicate that the orbit accuracy of better than 8 cm can be reached for JGM3, EGM96, EGM2008 and EIGEN-6C4 gravity models with over 40 degrees and orders. The orbit accuracies of EGM2008 and EIGEN-6C4 gravity models are better than JGM3 and EGM96.

Swarm, gravity field model, reduced-dynamic method, orbit accuracy (Page：1)

Analysis of Development Status of LiDAR StandardsbyGUO Yufang

AbstractLiDAR is a fast evolving technology of active remote sensing. It has some incomparable advantages over traditional techniques of surveying and mapping, such as high accuracy, abundant information amount etc. With a growing requirement for the wide applicability of LiDAR, LiDAR standards were widely concerned by diferent departments. On the basis of the latest development of LiDAR standards in foreign developed countries, the status of LiDAR standards in China was analyzed in this paper. And then, the strategies for developing and improving LiDAR standards were proposed.

Key wordsLiDAR, point cloud, standard, geographical information (Page：4)

Automatic Extraction of Sporadic Vegetation from High Resolution Remote Sensing ImagesbyJIANG Weiwei

AbstractSporadic vegetation extraction lacks efcient features due to small size, scattered distribution, blur edge, a lot of mixed pixels. This paper proposed some new features of sporadic vegetation based on visual attention theory, and then on the basis of the new features, utilized fuzzy adaptive resonance theory (FART) to propose an automatic extraction method of sporadic vegetation. The paper used color and near infrared high resolution images respectively to test this method, and compared with the object-based method of eCognition software. The results prove that this method is more efective on sporadic vegetation extraction, especially for color images.

Key wordssporadic vegetation, biological vision, classifcation feature, visual attention, FART (Page：6)

Research on Typical Features Interpretation Rule Base in Complicated Mountain EnvironmentbyHU Yan

AbstractTaking mountain area in Chongqing as the study area, the WorldView-2 images as the research objects, based on vegetation dimension data, this paper used the object-oriented classification method to discuss the characteristics of texture, geometry and structure of typical features in complicated mountain environment. And then, the paper built the interpretation rule base of remote sensing classification, which suitable for complicated mountain environment, and evaluated the accuracy of the classifcation results. This base can automatic classify and interpret the features. The results show that the interpretation rules based on the objectoriented classification method are suitable for high resolution remote sensing images and vegetation dimension data to overcome the difculties of classifcation between broad-forest and orchard.

Key wordsinformation extraction, rule base, object-oriented, classifcation, complicated mountain environment (Page：9)

Precision Analysis of Dynamic Service of Regional BeiDou Groundbased Augmentation SystembyXIE Yubing

AbstractIn this paper, the data model of BeiDou Navigation Satellite System (BDS) was analyzed, and the precision of dynamic service was tested by practical cases. The results show that the precision indexes of dynamic service of regional BeiDou ground-based augmentation system completely satisfy the requirements of relevant standards. Especially compared with traditional GPS augmentation system, the combination of BDS+GPS has larger advantages, which presents the advantage of multi-system integration and ofers abundant data supports for the promotion and application of BDS in relevant felds.

Key wordsregional BeiDou ground-based augmentation system, dynamic service, precision analysis (Page：12)

Design and Implementation of Geographical Conditions Census Database System in Anhui ProvincebyWEI Xuemei

AbstractIn this paper, from the aspects of overall design, key technologies, database construction and the design and implementation of database management system, we introduced the construction and application of geographical conditions census database system in Anhui Province in detail. The completion of the system, on one hand can realize the efcient management of national conditions census data, on the other hand can reserve for data exchange interface for updating and sharing of data between the national and provincial census database.

Key wordsnational conditions census, database, geographical data, data update (Page：14)

Overall Design Idea ofProvincial Poverty Alleviation Area Image Map inShaanxibyLIU Lingling

AbstractStarting from the project purpose, based on the characteristics of GIS data, the image particularity and mapping requirements, this article studied and practiced the production method of national poverty alleviation area thematic image maps where national (provincial) geographical conditions monitoring were taken. And then, taking Shaanxi Province for example, this paper expounded the overall design idea of poverty alleviation area thematic image map, from the designs of breadth, content and symbol.

Key wordsUAV aerial image, national (provincial) geographical conditions monitoring, image map, poverty alleviation, overall design (Page：18)

Practice of Urban Component Census in Guangzhou Based on New National StandardbyZHAN Jinrui

AbstractUrban component census is a basic work in the construction of digital urban management system, and is an important work of realizing the fine, digitization, scientific, regular, humanized management of city. This paper introduced the component census collection and storage process in Guangzhou City. And then, the paper described the updating and adjusting of component census, according to the new national standard.

Key wordscomponent census, digital urban management, data collection (Page：21)

Application of Geographical Conditions Monitoring in Soil Erosion of Qinling MountainsbyMA Penggang

AbstractUsing the results of geographical conditions monitoring, this paper analyzed the land use change features of Qinling Mountains Dan River Basin form 2010 to 2014. And then, the paper investigated the efect of land use changes for soil erosion. The results show that slight erosion and erosion tended decrease slightly in fluctuation, and moderate erosion to severe erosion are rising. To a certain extent, Dan River Basin’s erosion is increasing.The cultivated land and bare land’s soil erosion are serious.

Key wordsland use change, soil erosion, the amount of soil conservation (Page：24)

Application of UAV Remote Sensing in the Emergency ProtectionbyZHANG Pan

AbstractUAV has the characteristics of flexibility, rapid response, low cost and so on. UAV is also capable of operating in high-risk places, and has already become an important means of emergency protection of surveying and mapping. Taking Zhangmu Port for example, this paper introduced the UAV system, the processes of image acquisition and image processing. And then, the paper used PixelGrid to demonstrate the feasibility of this method.

Key wordsUAV, image processing, emergency (Page：27)

Research on the Establishment Method of Macrocosm Cadastral Database in Chengdu CitybyMENG Yanzi

AbstractBased on the divide management of urban and rural cadastral management, this paper solved the problems of coordinate transformation, standard setting and united coding of diferent periods, diferent instruments, different accuracy and different contradictions right type of multi-source heterogeneous cadastral data. And then, taking the urban and rural cadastral data in Chengdu City for example, the paper preliminary studied the establishment method of macrocosm cadastral database.

Key wordsmacrocosm, cadastre, Chengdu City (Page：30)Key Technical Points of Data Quality Inspection of Geographical Conditions ElementbyHE Dejun

AbstractCombining the characteristics of the first national geographical conditions census and some experiences in the practical inspection work, we introduced the main content and method of the quality inspection of geographical conditions element data comprehensively. And then, we discussed the key technical points in the process of quality inspection, and