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Zhan Z.,Wuhan University | Zhan Z.,Key Laboratory for Land Environment and Disaster Monitoring of SBSM | Lu L.,Wuhan University
Journal of Geomatics

Possibility and task assignment method of image distortion correction based on GPU parallel processing technology are analyzed firstly. Then, the algorithm based on GPU is described in detail, which includes two parts: host-side and device-side. Results show that the presented method is feasible and high-efficient. Source

Wang C.,Central South University | Wang C.,Key Laboratory for Land Environment and Disaster Monitoring of SBSM | Li Z.,Central South University | Zhu J.,Central South University | And 2 more authors.
Journal of Computational Information Systems

In this paper, we introduce polarimetric information into traditional differential interferometry SAR technique to measure water level changes of river. The flooded forests make it possible to measure the water level changes because of strong energy backscattering from water-trunk structure. The polarimetric information can be used to distinguish flooded and non-flooded forest and improve interferometric coherence. We select two fully polarimetric ALOS PALSAR images over Tapajós river in Amazon floodplain to investigate the water level changes. After applying the polarimetric coherence optimization, we use the optimal interferogram to measure the water level changes. The results demonstrate that the optimal interferogram has much higher coherence than that of the HH interferogram, and thus produce more reliable measurement. © 2005 by Binary Information Press. Source

Shi B.,Tongji University | Shi B.,Shanghai Institution of Tourism | Shi B.,Center for Spatial Information Science and Sustainable Development | Liu C.,Tongji University | And 5 more authors.
2011 International Symposium on Image and Data Fusion, ISIDF 2011

An extended oscillatory correlation segmentation algorithm is complied to perform unsupervised scene segmentation for hyperspectral imagery(HSI). According to perceptual mechanism, the high variances associated with bright intensity values are just salient regions of scene. Instead of lateral potential, saliency map is hired to obtain self-excitable cell.Then hyperspectral imagery is segmentated by extended LEGION. With these steps, more accurate initial residential areas can be obtained, but with many deficiencies including the existence of holes and useless patches. To resolve these problems, a morphological space based method is used to dissolve these residential patches. Experiment on PHI-3 data demonstrates the utility of the algorithm for residential areas recognition. © 2011 IEEE. Source

Wang J.,Key Laboratory for Land Environment and Disaster Monitoring of SBSM | Gao J.-X.,State Key Laboratory of Coal Resources and Mine Safety | Xu C.-H.,State Key Laboratory of Coal Resources and Mine Safety
ICCSE 2010 - 5th International Conference on Computer Science and Education, Final Program and Book of Abstracts

Modern teaching theory is presented in this paper and the discovery learning strategy is introduced into Surveying education. The concept of discovery learning is firstly discussed, and then the paper point out that the discovery learning is the inherent needs of the content of surveying. The teaching mode of Surveying based on discovery learning theory is proposed and analyzed with respect to specific teaching contents. At last, teaching and learning strategy is studied in four aspects: the strategy of question, the strategy of situation, the strategy of information and the strategy of homework. ©2010 IEEE. Source

Jiang W.,Wuhan University | Yuan P.,Wuhan University | Tian Z.,Key Laboratory for Land Environment and Disaster Monitoring of SBSM | Xiao Y.,Wuhan University
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University

In order to prevent the gaps in coordinate datum between different regional continuously operating reference systems (CORS), we analyze the causes and introduce a method for coordinate datum unification. Using experimental data from the Hubei and Hunan CORS, the results show that the systematic deviation reaches 17.9±4.5 mm between these two datums. The proposed method establishes a unified coordinate datum to eliminate the systematic deviation and builds connections between each coordinate datum. The validity of our method was supported by empirical evidence. Finally, some suggestions about coordinate datum unification for a regional CORS network combination are put forward. Source

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