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1.
ZHANG Jingxiong David Roy Sadashiva Devadiga ZHENG Min 《地球空间信息科学学报》2007,10(1):44-50
With remote sensing information products becoming increasingly varied and arguably improved, scientific applications of such products rely on their quality assessment. In an operational context such as the NASA (National Aeronautics and Space Administration) information production based on the MODIS (Moderate Resolution Imaging Spectroradiometer) instrument on board Earth Observing System (EOS) Terra and Aqua satellites, efficient ways of detecting product anomaly, i.e., to discriminate between product artifacts and real changes in Earth processes being monitored, are extremely important to assist and inform the user communities about potential unreliability in the products. A technique for anomaly detection, known as MAD (the median of absolute deviate from the median), in MODIS land products via time series analysis is described, which can handle intra- and in-ter-annual variation in the data by using MAD statistics of the original data and their first-order difference. This method is shown to be robust and work across major land products, including NDVI, active fire, snow cover, and surface reflectance, and its applicabil-ity to multi-disciplinary products is anticipated. 相似文献
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CHEN Luyao YUE Jianwei JIANG Weiguo LI Jing CHEN Yunhao 《地球空间信息科学学报》2007,10(4):299-302
The unceasing change problem of land information systems can be resolved through the refactoring and design pattern. To promote the implementation of design pattern and refactoring methods in developin... 相似文献
3.
LIU Yanfang HUANG Liangprofessor School of Resource Environment Science Wuhan University Luoyu Road Wuhan China. 《地球空间信息科学学报》2002,5(3):46-52
1 ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｓｙｓｔｅｍｏｆｌａｎｄｕｓｅｉｓａｖｅｒｙｃｏｍｐｌｅｘｓｙｓｔｅｍ .Ｗｅｄｒａｗｕｐｔｈｅｐｒｏｊｅｃｔｏｆｌａｎｄｕｓｅｐｌａｎｎｉｎｇｓｔｒｕｃｔｕｒｅｔｏｉｍｐｌｅｍｅｎｔｔｈｅｏｐｔｉ ｍｉｚａｔｉｏｎｏｆｌａｎｄｒｅｓｏｕｒｃｅｓ .Ｔｈｅｏｐｔｉｍｉｚａｔｉｏｎｏｆｌａｎｄｕｓｅｓｔｒｕｃ ｔｕｒｅｉｓｔｈｅｋｅｒｎｅｌｏｆｌａｎｄｕｓｅｐｌａｎｎｉｎｇ .Ｔｏｄａｙ,ｍｏｓｔｏｆｔｈｅｕｒｂａｎｌａｎｄｕｓｅｐｌａｎｓｏｎｌｙｃｏｎｓｉｄｅｒｔｈｅｏｐ… 相似文献
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Abstract The objective of this study was to explore the utility of multi‐temporal, multi‐spectral image data acquired by the IKONOS satellite system for monitoring detailed land cover changes within shrubland habitat reserves. Sub‐pixel accuracy in date‐to‐date registration was achieved, in spite of the irregular relief of the study area and the high spatial resolution of the imagery. Change vector classification enabled features ranging in size from tens of square meters to several hectares to be detected and six general land cover change classes to be identified. Interpretation of the change vector classification product in conjunction with visual inspection of the multi‐temporal imagery enabled identification of specific change types such as: vegetation disturbance and associated increase in soil exposure, shrub removal, urban edge vegetation clearing and fire maintenance, increase in vegetation cover, spread of invasive plant species, fire scars and subsequent recovery, erosional scouring, trail and road development, and expansion of bicycle disturbances. 相似文献
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Devastu Ramprasad Naik Suryaprakasarao Bosukonda Kamireddy Mrutyunjayareddy 《Journal of the Indian Society of Remote Sensing》2011,39(2):271-278
The present study aims to estimate the loss of land use/cover and infrastructure facilities due the submergence by constructing
the reservoir over the River Godavari at Polavaram Village. Detailed Land use/cover mapping has been carried out using LISS-III
sensor data of IRS P6 satellite and linked to socio-economic data to analyze the administrative boundary wise environmental
impact assessment in the study area. Land use/cover features are estimated from the Remote Sensing data through visual interpretation.
Area covered below the 45.72 m contour above the mean sea level (MSL) is taken as submerged area due to the dam construction.
Total area under submergence is estimated to be 58,658 ha, where 159 villages of three districts are affected by the project.
The total population to be rehabilitated is about 1.2 lakhs, out of which maximum affected are Scheduled Tribes (58,781).
Besides this, about 311 educational institutions, 202 medical institutions, 37 credit institutions and 55 postal institutions
will be submerged due to the project. Further, nine mining sites, 24 tourist/historical sites and 78 agro-based industries
will be displaced. The total road length of 673 km will go under submergence. 相似文献
7.
Soe Win Myint 《国际地球制图》2013,28(4):29-40
Abstract Attempts to analyze urban features and to classify land use and land cover directly from high‐resolution satellite data with traditional computer classification techniques have proven to be inefficient for two primary reasons. First, urban landscapes are composed of complex features. Second, traditional classifiers employ spectral information based on single pixel value and ignore a great amount of spatial information. Texture plays an important role in image segmentation and object recognition, as well as in interpretation of images in a variety of applications. This study analyzes urban texture features in multi‐spectral image data. Recent developments in the very powerful mathematical theory of wavelet transforms have received overwhelming attention by image analysts. An evaluation of the ability of wavelet transform in urban feature extraction and classification was performed in this study, with six types of urban land cover features classified. The preliminary results of this research indicate that the accuracy of texture analysis in classifying urban features in fine resolution image data could be significantly improved with the use of wavelet transform approach. 相似文献
8.
LIU Yaolin ZHANG Yumeiprofessor School of Resource Environment Science Wuhan University Luoyu Road Wuhan China. 《地球空间信息科学学报》2002,5(3):26-32
1 ＩｎｔｒｏｄｕｃｔｉｏｎＧｒａｄｉｎｇｕｒｂａｎｌａｎｄｃｏｒｒｅｃｔｌｙａｎｄｄｅｔｅｒｍｉｎｉｎｇｔｈｅｌａｎｄ ｐｒｉｃｅａｒｅｉｍｐｏｒｔａｎｔｂａｓｉｃｗｏｒｋｔｏｃａｒｒｙｏｕｔｔｈｅｃｏｍｐｅｎｓａｔｉｏｎａｌｅｘ ｐｌｏｉｔａｔｉｏｎａｎｄｄｅｖｅｌｏｐｔｈｅｒｅａｌｅｓｔａｔｅｍａｒｋｅｔ.Ｔｈｅｌａｎｄｇｒａｄｉｎｇｍｕｓｔｂｅｂｕｉｌｔｏｎｏｂｊｅｃｔｉｖｅｅｖａｌｕａｔｉｏｎａｎｄｓｃｉｅｎｔｉｆｉｃｅｖａｌｕａｔｉｏｎａｎｄｃａｌｃｕｌａｔｉｏｎｏｆｌａｎｄ ｑｕａｌｉ… 相似文献
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Abstract A classification method was developed for mapping land cover in NE Costa Rica at a regional scale for spatial input to a biogeochemical model (CENTURY). To distinguish heterogeneous cover types, unsupervised classifications of Landsat Thematic Mapper data were combined with ancillary and derived data in an iterative process. Spectral classes corresponding to ground control types were segregated into a storage raster while ambiguous pixels were passed through a set of rules to the next stage of processing. Feature sets were used at each step to help sort spectral classes into land cover classes. The process enabled different feature sets to be used for different types while recognizing that spectral classification alone was not sufficient for separating cover types that were defined by heterogeneity. Spectral data included the TM reflective bands, principal components and the NDVI. Ancillary data included GIS coverages of swamp extents, banana plantation boundaries and river courses. Derived data included neighborhood variety and majority measures that captured texture. The final map depicts 18 land cover types and captures the general patterns found in the region. Some confusion still exists between closely related types such as pasture with different amounts of tree cover. 相似文献
10.
The Application of BP Networks to Land Suitability Evaluation 总被引：7，自引：1，他引：7
LIUYanfang JIAOLimin 《地球空间信息科学学报》2002,5(1):55-61
The back propagation (BP) model of artificial neural networks (ANN) has many good qualities comparing with ordinary methods in land suitability evaluation.Through analyzing ordinary methods‘ limitations,some sticking points of BP model used in land evaluation,such as network structure,learning algorithm,etc.,are discussed in detail,The land evaluation of Qionghai city is used as a case study.Fuzzy comprehensive assessment method was also employed in this evaluation for validating and comparing. 相似文献
11.
JIAO Limin LIU Yaolin 《地球空间信息科学学报》2007,10(2):151-156
A novel model of land suitability evaluation is built based on computational intelligence (CI). A fuzzy neural network (FNN) is constructed by the integration of fuzzy logic and artificial neural network (ANN). The structure and process of this network is clear. Fuzzy rules (knowledge) are expressed in the model explicitly, and can be self-adjusted by learning from samples. Genetic algorithm (GA) is employed as the learning algorithm to train the network, and makes the training of the model efficient. This model is a self-learning and self-adaptive system with a rule set revised by training. 相似文献
12.
AutoCAD Land Development Desktop在测绘工程中的应用 总被引：3，自引：1，他引：3
鉴于AutoCADLandDevelopmentDesktop与现今很多的土木工程设计软件相兼容,本文结合实际测绘工作经验,对该软件的主要功能模块进行较为详细的说明,针对具体工程测量中遇到的数据采集、组织、检查以及土方量计算等方面的问题提出了解决方法,同时指出了在使用该软件过程应该注意的问题。 相似文献
13.
Optimization of land use structure consists of economic and social and ecological optimization.Applying the minds of system engineering and principles of ecology,this paper presents such thoughts:the optimal forest-coverage rate calculated according to the reality of a district is set as main standard of ecological rationality in the district;through considering the value of ecosystem services of the land with GREEN equivalent(mainly cultivated land and grassland)and based on the rule GREEN equivalent,this paper introduces the area conversion between woodland and cultivated land ,also between woodland and grassland;this paper establishes a multi-dimension controlling model of optimization of land use structure,In addition,a multiobjective linear programming model for optimization of land use structure is designed.In the end,this paper tests and verifies this theory of ecological optimization,taking Qionghai city in Hainan Province as an example. 相似文献
14.
LIU Yaolin ZHENG Bin HUANG Lina TANG Xu 《地球空间信息科学学报》2007,10(3):228-234
The research attempts to find out how the location of the CBD(central business district), the dis- tance to the main roads, the distribution of the public facilities, and the urban land-use pattern influence the urban residential land value variations. The study begins by identifying the influences into two categories: general circumstance and micro/neighboring circumstances. Benchmark price and market land value are tested to be the results influenced by general circumstance and both the influential range and the influential force of individual land-use are investigated and compared. At last explicit case comparisons are also taken for testing the result. The finding of the research is not only useful for understanding the spatial patterns of land values, but also beneficial for the policy-makers concerning land administration and urban planning. 相似文献
15.
Abstract The goal of this research was to explore the utility of very high spatial resolution, digital remotely sensed imagery for monitoring land‐cover changes in habitat preserves within southern California coastal shrublands. Changes were assessed for Los Penasquitos Canyon Preserve, a large open space in San Diego County, over the 1996 to 1999 period for which imagery was available. Multispectral, digital camera imagery from two summer dates, three years apart, was acquired using the Airborne Data Acquisition and Registration (ADAR) digital‐camera system. These very high resolution (VHR) image data (1m), composed of three visible and one near‐infrared wavebands (V/NIR), were the primary image input for assessing land cover change. Image‐derived datasets generated from georeferenced and registered ADAR imagery included multitemporal overlays and multitemporal band differencing with threshold selection. Two different multitemporal image classifications were generated from these datasets and compared. Single‐date imagery was analyzed interactively with image‐derived datasets and with information from field observations in an effort to discern change types. A ground sampling survey conducted soon after the 1999 image acquisition provided concurrent ground reference data. Most changes occurring within the three‐year interval were associated with transitional phenological states and differential precipitation effects on herbaceous cover. Variations in air temperatures and timing of rainfall contributed to differences that the seven‐week image acquisition offset may have caused. Disturbance factors of mechanical clearing, erosion, potentially invasive plants, and fire were evident and their influence on the presence, absence, and type of vegetation cover were likely sources of change signals. The multitemporal VHR, V/NIR image data enabled relatively fine‐scale land cover changes to be detected and identified. Band differencing followed by multitemporal classification provided an effective means for detecting vegetation increase or decrease. Detailed information on short‐term disturbance effects and long‐term vegetation type conversions can be extracted if image acquisitions are carefully planned and geometric and radiometric processing steps are implemented. 相似文献
16.
Abstract Studies on land surface processes using remote sensing data gains importance in the context of Geosphere Biosphere Programme. Present study addresses the applicability of split‐window method, in a tropical environment for mapping of surface temperature over heterogeneous surface from satellite data. The accuracy of the method is about +2.2°K, which is reasonable value taking into account the atmospheric attenuation in tropical environment. An attempt has been made to derive emissivity from normalized difference vegetation index (NDVI) by taking into account the fraction of vegetation cover of each pixel, which is determined by satellite data. The emissivity values estimated from satellite data found to be in reasonable agreement with an estimated error of less than 1%. The results of the study indicate the potential use of NDVI as a modulating parameter in the land surface temperature estimation from satellite data. 相似文献
17.
《地球空间信息科学学报》2003,(4)
Dynamic balance between supply and demand of cultivated land means keeping the balance between supply and demand of cultivated land within a certain area with the pas- 相似文献
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YANQin ZHANGJixian 《地球空间信息科学学报》2002,5(2):51-55
This paper gives some guidelines of land use planning firstly.A framework of agriculture land use planning is designed based on land use suitability evaluation using integrated technologies of RS and GIS.Further work expected is also given. 相似文献
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In coastal areas, environmental monitoring is an important tool in acquiring data to achieve the goal of sustainable usage relating to the character of changes in quantity and quality of land cover / land use. Studies can reveal the diversity of species and the natural factors and human influence affecting this diversity, occurring as a result of habitat fragmentation or destruction. As well as comparing the past and current state of environmental resources, monitoring helps to determine trends in the use and changes of resources. It was in this context that Kad?rga Bay, located on the northwest coast of Canakkale province, Turkey was studied. Also situated in this location is Assos, a significant site in ancient history with great tourism potential. This study determined changes in land cover / land use by means of photogrammetrical interpretation of data from 1957 to 2002. The research further aimed to determine pressure on the components of the ecological structure of the area. Based on the data obtained, projections can be made to protect the future, and will provide an important source for management of the area. Within the 45-year study period, it was determined that agriculture and secondary housing construction exerted the most pressure on the habitat of the area. In the main, an increase in agricultural activities and secondary house construction emerged as the cause of a decrease in wetlands and forest areas. 相似文献