Advanced Materials Research Vols. 356-360

Abstract: Drought is one of the major natural disasters in China, it has extremely affected national food security. In this study, Normalized Difference Vegetation Index (NDVI) and surface temperature (Ts) were calculated by using 8-day composite Moderate-Resolution Imaging Spectroradiometer (MODIS) reflectance product data MOD09A1 and MOD11A2, then NDVI-Ts feature space was obtained and dry edge and wet edge equation was fit. According to coefficients of dry edge and wet edge equation, Temperature Vegetation Drought Index (TVDI) will be calculated and refer it as a drought monitoring indicator. In addition, drought monitoring and classification of Shandong province (China) was completed by TVDI from February to May,2011. Furthermore, the drought classification diagram was made and the drought area in each period was counted. The results showed revealed that: NDVI-Ts feature was roughly a triangular shape in the two-dimensional plane, and drought conditions could be better monitored through TVDI. Finally, the desktop demonstration system of drought monitoring was designed and some general functions were realized based on ArcGis Engine.

Abstract: For the characteristics of remote sensing satellite data, this paper adopts spatial information services of open source PostgreSQL database to analyze and calculate coverage of remote sensing data. The remote sensing data is shown in the Chinese administrative divisions intuitively in order to improve the efficiency in ordering the data. This paper addresses the method to calculate the coverage of remote sensing satellite data based on PostgreSQL.

Abstract: This paper studies the multi-satellites data fast acquisition programming technology for disaster area, and in this paper a disaster monitoring satellite data fast acquisition programming system is established. After the disaster, the system can program the multi-satellites observation schedule for the disaster area quickly and accurately, it can provide important technical support for the satellite data acquisition of the disaster area.

Abstract: The article takes 2 TM images as the data source, supported by the Fragstats 3.3 and the ENVI 4.7 softwares, two remote sensing images are classified by the support vector machine method, selects the number of patches (NP), edge density (ED), patches density (PD), landscape shape index (LSI), perimeter area fractal dimension (PAFRAC), interspersion juxtaposition index (IJI), patch cohesion index (COHESION), Shannon's diversity index (SHDI), Shannon's evenness index (SHEI) and contagion index (CONTAG), using the landscape ecological principles and methods, analyzes the dynamic changes of Dangshan landscape patter in 1987-2009, with a view to Dangshan county land resources of reasonable planning and using, management, sustainable utilization, and the landscape pattern optimization configuration, provides the theory foundation and scientific basis.

Abstract: The paper,mainly using 3 scenery TM remote sensing images of Landsat satellite and 1 scenery ETM⁺ remote sensing image, carried out monitoring and analyzing of the land use / cover change of Dangshan County, including Dangshan County from 1987 to 2009 a total of 23 years of land use / cover change features, land-use conversion relations between types, and discussed the main reason for change. This provided the theory and basis for the Dangshan County urban environment change research, the urban planning, and the urbanized prospect forecast. Conclusions: With the rapid economic development of Dangshan County, and the level of urbanization constantly improved, Dangshan County land use had changed greatly, from 1987 to 2009, construction land and cultivated land had always been dominant position in the 23 years, the stability type area was 367.38 km², accounted for 30.79%, the changed area accounted for 69.21%, the changed area ratio to 3.01% per year, the comprehensive land-use dynamic degree was 1.50%.

Abstract: FCD-based traffic navigation system is getting more and more attention from countries all over the world. Shortest path algorithm is one of the key techniques of a traffic navigation system. Since classical Dijkstra algorithm and heuristic A* algorithm cannot support some constrained conditions in practice, and existing algorithms supporting constraints require the road network to be modified ahead and have low efficiency. The paper studies the model of road network, and analyzes two types of constraints, one-way street and intersection turning prohibitions, then proposes the constrained A* algorithm and gives the Heuristic function. Finally, the paper tests and analyzes the algorithm, and evaluation performance of the prototype system which employs it. The result shows that the algorithm’s efficiency is fairly good.

Abstract: Based on the RS and GIS technology, the remote sensing imageries MSS in 1975, ETM in 2000 and CBERS-2 in 2007 have been used as main data source in this paper. Wetland current distribution, spatiotemporal change principle and transition matrix have been analyzed in order to realize the wetland change situation in Northeast China during the 30 years. The results show that the wetland area in Northeast China, on the whole, is decreased first and then increased. The dramatic change happened in mire and constructed wetland. Mire is decreased first and then increased, but the whole is still decreased. While, constructed wetland is increased continuously. Constructed wetland increased owing to the transition from mire and non-wetland. The level of the transition from mire to constructed wetland is lower. In Northeast China, human activities have a great impact on wetland change than nature factors.

Abstract: Remote sensing technology can be used to quickly extract macro information of the study area, and its advantages in monitoring water resources have become increasingly evident. In this study, Fenhe 2nd reservoir and Jinyang Lake in Taiyuan，Shanxi Province were examined using the remote sensing data obtained from HJ-1B on May 6, 2010. Water area of Fenhe 2nd reservoir was extracted using NDWI and improved segmentation threshold. The distribution of eutrophication and phytoplankton in Jinyang Lake were analyzed using NDPI and a profile map of phytoplankton was produced. Results show that spatial and spectral resolution of HJ-1B can meet the requirements of water resources monitoring well, which are conducive for further promotion and application of HJ-1B remote sensing data.

Abstract: The vacancy of hyperspectral image (HSI) in China is made up by HJ-1A satellite, which makes more study and application possible. But comparing with other HSI, low spatial resolution turns into a big limiting obstacle for application. In order to improve the HSI quality and make full use of the existing RS data, this paper proposed a fusion approach basing on 3D wavelet transform (3D WT) to fusing HJ-1A HSI and Multispectral image (MSI) using their 3D structure. Contrasting with the principal component transform (PCA) and Gram-Schmidt fusion approach, which are mature at present, 3D WT fusion approach use all bands of MSI to its advantage and the fusion result perform better in both spatial and spectral quality.

Abstract: ADCP is convenient for field measurements , But the work of data extraction is heavy , and the flow field distribution map and topographic contour map can’t get from the system software directly , so the rapid extraction of measurement data and mapping technology are two key technologies in river rapid survey by ADCP. This paper studies these two issues , proposed solutions, applied these technologies to the measurement of Nanguotou Permeable Pile Groynes on the Yellow River, and achieved satisfactory results.