Wang Juanle

Integrated GIS solution to mining subsidence assistant decision in mining area

Mining subsidence brings enormous damages in mining area. Facing this problem, the paper proposes a solution based on integrated GIS. It takes the coal mining, terrain motion, subsidence predication, surface destruction and disaster evaluation as a whole integrated system. The solution provides an assistant decision support for mining subsidences prevention and curing by means of classic probability integral model and GIS components model. Based on the research and analysis, a mining subsidence predication & assistant decision support system (abbreviated as MSPADSS) is developed using oriented object programming and component GIS development technology. MSPADSS is composed of five modules, i.e., data collection, mining subsidence predication, GIS graphic and attribute information management, surface subsidence damage evaluation and GIS spatial analysis & thematic mapping. All these are integrated in a whole system. Several recognitions and conclusions can be acquired through the research as follows: Firstly, prevention and curing of mining subsidence should consider many relative factors, which cover features from the bottom of the mine to the ground. Secondly, the subsidence prediction and damage evolution can be calculated and visualized synchronously by means of ComGIS developing. Thirdly, application of MSPADSS in the east of China shows that this integrated GIS solution is feasible and adoptable.

Validating remote sensing derived evapotranspiration with the soil and water assessment tool (SWAT) model: A case study in Zhelin Basin, China

Evapotranspiration (ET) is a major component in the water and heat balance of terrestrial ecosystems as well as in the water, energy and carbon cycles on the Earth’s surface. A growing number of studies have focused on the retrieval of ET from remote sensing (RS) data. However, the RS-derived ET results could not be validated by station-observed data directly for the difference of the scale. The objective of this study is to present an operational approach to validation of RS-derived ET under the support of a distributed hydrological model: soil and water assessment tool (SWAT). Five years (2000-2004) evapotranspiration data of Zhelin Basin, the study area, were prepared. RS-derived ET and other data (DEM, land-use data, soil data, etc) were processed together in SWAT to simulate the hydrological cycle. The output monthly runoff is compared with observed runoff data. The RS-derived ET was then validated based on the results of those comparison (R 2 =0.8516, RMSE=26.0860, MBE=-8.6578). It indicated that the method presented in the paper was an operational and feasible way for validation of ET data from remote sensing retrieval.

Study on Web-oriented geo-data sharing infrastructure and key techniques based on metadata

Development of metadata theories and their application techniques provide a solution to mass data sharing in Web. This paper analyzed the system infrastructure and studied key application techniques for geosciences data sharing based on metadata. To overcome the incompatibility of various metadata standards of geosciences, uniform metadata architecture is designed to ensure different discipline metadata standards working harmonically in the system. This top-down hierarchy model is composed of core metadata, schema metadata and application profile metadata. A metadata management system (MMS), the presentation of the geo-data sharing model, is developed in using RDF/XML technology recommended by W3C. MMSs hierarchy includes 3 tiers, i.e., application tier, RDF/XML resource description tier, and data resources tier. RDF/XML, served as a middle tier, plays an important part in MMS. Development and application of MMS in the Data-Sharing Network of China Earth System Science has proved that this technique solution is suitable for geosciences data sharing Web oriented

Land Cover Change Characteristics of North-South Transect in Northeast Asia from 2001 to 2012

Abstract: Northeast Asia is an area with relative concentrations of resources, a complex ecological environment pattern, and a marked human—land contrast relationship. This area has significance for analyzing land cover patterns and variations for regional sustainable development among the trans-boundary areas of China, Russia, and Mongolia. In this paper, the transect analysis research tool and transfer matrix method are used to capture the regional land cover change characteristics by using Moderate Resolution Imaging Spectroradiometer(MODIS) datasets recorded from 2001 to 2012. The spatial distribution results show that forests have increased dramatically, cropland increased marginally, and grassland and shrubs decreased totally. The inter-annual variation, results show a steady and slowly increasing trend for grassland and shrubs, dramatic fluctuation features with an increasing trend for forest land, and zigzag wave changing characteristic for cropland. The total land use dynamic degree (TLUDD)was steady, with an overall slightly increasing trend.

Spatio-Temporal Distribution of Drought in the Belt and Road Area During 1998–2015 Based on TRMM Precipitation Data

Abstract: Drought is a worldwide natural disaster that has long affected agricultural production as well as social and economic activities. Frequent droughts have been observed in the Belt and Road area, in which much of the agricultural land is concentrated in fragile ecological environment. Based on the Tropical Rainfall Measuring Mission Satellite (TRMM) 3B43 precipitation data, we used the Precipitation Abnormity Percentage drought model to study the monthly spatio-temporal distribution of drought in south region of N50° of the Belt and Road area. It was observed that drought during winter was mainly distributed in Northeast Asia, Southeast Asia, and South Asia, while it was mainly distributed in Central Asia and West Asia during summer. The occurrence of historical droughts indicates an obvious seasonal cycle. The regional variations in drought were analyzed using the Breaks for Additive Season and Trend tool (BFAST) in six sub-regions according to the spatial distribution of six economic corridors in the Belt and Road area. The average drought conditions over the 18 years show a slight decreasing trend in Northeast Asia, West Asia, North Africa, South Asia, Central and Eastern Europe, and a slight increasing trend in Central Asia. However, it was a fluctuating pattern of first increasing and then decreasing in Southeast Asia. The results indicate that the total drought area in the Belt and Road region showed a general decreasing trend at a rate of 40,260 km2 per year from 1998 to 2015.

Object-Oriented Method for Rural Residential Land Extraction in the Hilly Areas of Southern China Using RapidEye Data

Abstract: The process of rapid urbanization in China features two opposing trends: declining rural population and increasing rural residential land, especially in southern hilly areas. The extraction and analysis of residential land in rural China represents an important application for remote sensing technology. The study aimed to discover rural residential land information using RapidEye satellite imagery, taking Taihe County as the research area in the hilly region of southern China. Based on multiple experiments, classification was conducted with an optimal image segmentation scale set to 200. The object-oriented classification rule set was constructed using the customized parameters NDVI, NDWI, brightness, and length/width. The areas of residential land and other land use types were interpreted by varying the parameter values for classification rule sets. Finally, validation and accuracy evaluations were carried out. The overall accuracy of residential land interpretation is 78.40%, and producers accuracy and users accuracy are 68.75% and 77.33%, respectively. The results indicate that RapidEye provides a suitable data source for extraction of rural residential land using an object-oriented approach. Compared with the second national land survey of China, the classification gave an absolute difference of 93.67 ha residential land within the study area. Recognition errors occurred mainly in regions adjacent to the boundaries between residential land and other types of land.

Study on Resource and Environment Scientific Research Data Archiving Case Study for National Basic Research Program of China

The National Basic Research Program of China (also called 973 Program) is Chinas on-going national keystone basic research program. Based on deep consideration, Research projects in resource and environment field of 973 Program are selected as a pilot engineering for data archiving and sharing. Based on actual practices, the paper will introduce the general background, data archiving phases, data archiving metadata standard and tool kits, data archiving content and data sharing platform web oriented.

Land use Dynamic Changes and Ecological Effect in Jiaodong Region, China

Using remote sensing interpretation result for land use and analysis models, we analyse land use dynamic changes and ecological effect in Jiaodong region in three periods of time (1980s-1995, 1995-2000 and 1980s-2000). The study shows: in the nearly 15 years, the most prominent features of land use change are that, the area of urban land increased greatly, farm land decreased obviously, and urbanization was the important driver of land use change; the even value of regional ecological quality indexes stands almost at same level, and this shows that, in general, ecological quality of Jiaodong region changed little from 1980s to 2000; returning cultivated land to grassland, conversing cropland to forest, and returning farmland to lake were main drivers to improve ecological quality, and damage and reclamation of grass lands, farmland occupation for urban construction, farmland occupation for country construction and land reclamation from lake marshes were main drivers to decrease ecological quality.

Extensible Land Use Classification Framework Based on Remotely Sensed Image Facing to Data Integration, Exchange and Sharing

Land use information plays important role not only in social-economic development but also in scientific research area. With the development of the Information Technology, remotely sensed images provide main data sources for land use information and knowledge extraction in real time. While there are lots of land use classification systems in the world facing to different research or application purposes. And with the crossing of multi-disciplines and expanding of the research area, more and more land use classification systems are designed. This brings the difficulties for land use data setspsila integration, exchange and sharing under different classification systems. The problem faced to land use classification systems are similar with the problem of metadata standards in geographic information data management field. While ISO Metadata Standard 19115 designed by ISO TC 211 provides a perfect solution for geographic data integration, exchange and sharing. Enlightened by the ISO 19115 metadata extensible model, the paper brings forward the land use extensible classification framework. The framework is composed of 3 tiers, i.e., land use core classes, corpora classes and application profile classes. The core and corpora classes are derived from the main international land use classification systems in the world. Semantic exchange mechanism between core classes and other main classification in the world is designed supported by information techniques. Extension principle and methods are designed in this framework. This ensures many application classification profiles can be extended from the core classes and corpora classes easily.

Research and development of web oriented remote sensing image publication system based on Servlet technique

According to the requirements of China National Scientific Data Sharing Program (NSDSP), the research and development of web oriented RS Image Publication System (RSIPS) is based on Java Servlet technique. The designing of RSIPS framework is composed of 3 tiers, which is Presentation Tier, Application Service Tier and Data Resource Tier. Presentation Tier provides user interface for data query, review and download. For the convenience of users, visual spatial query interface is included. Served as a middle tier, Application Service Tier controls all actions between users and databases. Data Resources Tier stores RS images in file and relationship databases. RSIPS is developed with cross platform programming based on Java Servlet tools, which is one of advanced techniques in J2EE architecture. RSIPSs prototype has been developed and applied in the geosciences clearinghouse practice which is among the experiment units of NSDSP in China.