Mining knowledge from result comparison between spatial clustering themes     

SHAZongyao BIANFuling 《地球空间信息科学学报》2005,8(1):57-63

This paper introduces some definitions and defines a set of calculating indexes to facilitate the research, and then presents an algorithm to complete the spatial clustering result comparison between different clustering themes. The research shows that some valuable spatial correlation patterns can be further found from the clustering result comparison with multi-themes, based on traditional spatial clustering as the first step. Those patterns can tell us what relations those themes have, and thus will help us have a deeper understanding of the studied spatial entities. An example is also given to demonstrate the principle and process of the method.  相似文献   

Improved geological mapping using landsat-5 TM data in Weixi area, Yunnan province China     

TarikBashirBenomar BIANFuling 《地球空间信息科学学报》2005,8(2):110-114

Different image processing algorithms have been evaluated in the context of geological mapping using Landsat TM data. False color composites, the principal component imagery, and IHS decorrelation stretching method for Landsat-5 TM data have been found useful for delineating the regional geological features, mainly to provide the maximum geological information of the studied area . The study testifies that using which image processing yields best results for geological mapping in arid and semiarid regions by preserving morphological and spectral information. Generally, the studied area can be divided into three main geological units: Basaltic intrusive rocks, Metamorphic with varying intensities and Sedimentary rocks.  相似文献   

Identifying components for interoperable process models using concept lattice and semantic reference system     

Ling Bian  Shixiong Hu 《International journal of geographical information science》2013,27(9):1009-1032

The development of interoperable environmental process models is widely supported by both the research community and government agencies. This paper discusses a conceptual framework to guide the delineation of process components, the basic unit of interoperable models. The concepts of semantic reference system and dual hierarchy are explored to establish the conceptual framework. Based on this discussion, the Formal Concept Analysis is used as an analytical approach to decompose and fuse existing environmental process models in order to identify environmental process components. For purposes of discussion, a hydrological process, surface runoff, is used throughout the paper as an example of an environmental process to support the conceptual discussion and to illustrate the application of the conceptual framework and analytical approach.  相似文献   

Detrimental effects of reduced seawater pH on the early development of the Pacific abalone     

Jiaqi Li  Zengjie Jiang  Jihong Zhang  Jian-Wen Qiu  Meirong Du  Dapeng Bian  Jianguang Fang 《Marine pollution bulletin》2013

The hatching process of the Pacific abalone Haliotis discus hannai was prolonged at a pH of 7.6 and pH 7.3, and the embryonic developmental success was reduced. The hatching rate at pH 7.3 was significantly (10.8%) lower than that of the control (pH 8.2). The malformation rates at pH 7.9 and pH 8.2 were less than 20% but were 53.8% and 77.3% at pH 7.6 and pH 7.3, respectively. When newly hatched larvae were incubated for 48 h at pH 7.3, only 2.7% of the larvae settled, while more than 70% of the larvae completed settlement in the other three pH treatments. However, most 24 h old larvae could complete metamorphosis in all four pH treatments. Overall, a 0.3-unit reduction in water pH will produce no negative effect on the early development of the Pacific abalone, but further reduction in pH to the values predicted for seawater by the end of this century will have strong detrimental effects.  相似文献   

Magnetic detection method for seabed cable in marine engineering surveying     

Bo Yu  Yanchun Liu  Guojun Zhai  Gang Bian  Fumin Xiao 《地球空间信息科学学报》2013,16(3):186-190

The detection and identification of the seabed cable is becoming an important task in the marine engineering. The features of the magnetic anomaly can be used to detect the existence of the seabed cable. The magnetic field model is presented, and the consistency of the magnetic anomaly distribution between the simulation of the model and the observed data is verified. The comparison shows that the seabed cable can be effectively detected and identified with reasonable method.  相似文献   

Spatio-temporal data model based on relational database system     

Sha Zongyao  Bian Fuling 《地球空间信息科学学报》2013,16(2):22-27

In this paper, the entity-relation data model for integrating spatio-temporal data is designed. In the design, spatio-temporal data can be effectively stored and spatiao-temporal analysis can be easily realized.  相似文献   

Recovery of bathymetry from altimeter data     

Huang Motao  Zhai Guojun  Ouyang Yongzhong  Bian Shaofeng 《地球空间信息科学学报》2013,16(1):27-33

At present, there exist two methods used to recover the bathymetry from altimeter data, i. e. the deterministic method and the stochastic method. In this paper, the principles of the two methods are introduced first. Then according to the theory of least-square collocation, a modified statistical model for recovering bathymetry from altimeter data is proposed. The new model has been used for computing the ocean depth in the South China Sea from altimeter-derived gravity anomalies. Finally the predicted depths are compared with the ship-borne depth. It shows that they agree with each other very well.  相似文献   

Spatio-temporal GIS data model based on event semantics     

Xu Zhihong  Bian Fuling 《地球空间信息科学学报》2013,16(3):43-47

There are mainly four kinds of models to record and deal with historical information. By taking them as reference, the spatio-temporal model based on event semantics is proposed. In this model, according to the way for describing an event, all the information are divided into five domains. This paper describes the model by using the land parcel change in the cadastral information system, and expounds the model by using five tables corresponding to the five domains. With the aid of this model, seven examples are given on historical query, trace back and recurrence. This model can be implemented either in the extended relational database or in the object-oriented database.  相似文献   

Interrelations between socio-economic development and environmental quality: a simulation integrating system dynamics models with GIS     

Yu Jie  Bian Fuling  Peterson Jim  Li Pingxiang 《地球空间信息科学学报》2013,16(3):176-182

System dynamics (SD) theory has long been deployed in modeling complex non-linear interrelationships but, so far it has not been common to do the kind of modeling in support of bringing environmental sustainability policies to practice. This is largely because the challenge of including spatial data has not yet been well met. Potential for adoption of SD and GIS methods in combination is exemplified with the results of a decision-support exercise designed for simulation and prediction of the dynamic inter-relationships between socio-economic development and environmental quality for the “Wen, Pi, Du” county in Sichuan province, southwestern China.  相似文献   

松辽盆地深层火山岩储层测井响应及地质解译   总被引：1，自引：0，他引：1  

吴颜雄  王璞珺  边伟华  高有峰  郎元强 《吉林大学学报(地球科学版)》2012,(6):1927-1934,1965

为研究测井信息与地质属性的对应性,利用丰富的岩心描述结果刻度测井资料,对12种常见火山岩常规测井和8种成像测井图像进行地质解译。结果表明,火山岩地质属性的测井响应具有普遍性。常规测井中自然伽马和密度曲线对基、中、酸性火山岩响应明显,电阻率和三孔隙度曲线对火山岩的结构构造及孔缝响应明显。成像测井模式具体为:凝灰结构表现出高阻亮点模式,原生气孔表现出低阻暗点模式,流纹构造表现出中高阻黄白相间的正弦曲线模式,角砾结构表现出高阻亮块和低阻暗点模式,低角度裂缝表现出低阻正弦曲线模式,沉火山角砾结构表现出中低阻黄橙相间正弦曲线模式,火山碎屑溶孔表现出亮块中含暗点模式,块状结构表现出亮块模式。  相似文献