International Symposium on Digital Earth最新文献

{"title":"Constructing DEM from characteristic terrain information using HASM method","authors":"Dun-Jiang Song, T. Yue, Z. Du, Qingguo Wang","doi":"10.1117/12.873149","DOIUrl":"https://doi.org/10.1117/12.873149","url":null,"abstract":"In the construction of DEM, terrain features (e.g. valleys or stream lines, ridges, peaks, saddle points) are important for improving DEM accuracy and saw many applications in hydrology, precision agriculture, military trajectory planning, etc. HASM (High Accuracy Surface Modeling) is a method for surface modeling, which is based on the theory of surface. Presently, HASM is only used for scattered point's interpolation. So the work in this paper attempts to construct DEM based on the characteristic terrain information as stream lines and scattered points by HASM method. The course is described as the following steps. Firstly TIN (Triangulated Irregular Network) from the scattered points is generated. Secondly, each segment of the stream lines is well oriented to represent stream lines' flow direction, and a tree data structure (that has parent, children and brothers) is used to represent the whole stream lines' segments. A segment is a curve which does not intersect with other segments. A Water Course Flow (WCF) line is a set of segment lines connected piecewise but without overlapping or repetition, from the most upper reaches to the most lower reaches. From the stream lines' tree data structure, all the possible WCF lines are enumerated, and the start point and end point of each WCF lines is predicted from searching among the TIN. Thirdly, given a cell size, a 2-D matrix for the research region is built, and the values of the cells who were traversed by the stream lines by linear interpolation among each WCF lines. Fourthly, all the valued cells that were passed through by the stream line and that were from the scattered points are gathered as known scattered sampling points, and then HASM is used to construct the final DEM. A case study on the typical landform of plateau of China, KongTong gully of Dongzhi Plateau, Qingyang, Gausu province, is presented. The original data is manually vecterized from scanned maps 1:10,000, includes scattered points, stream lines, contour lines, precipitous cliff lines of a region of area about 4×5 square km. For simplicity only the former two kinds of data sources are used. By Comparing with the result from stream-line-constrained TIN and hydrologically correct DEM construction method Thin plate Spline (TPS, that is implemented as command TopoToRaster in ArcGIS 9.0 and later version)through visual inspection, HASM gets a more desirable DEM and more reasonable integration of information of the terrain features. Finally, some challenges and future research about HASM is also given.","PeriodicalId":417031,"journal":{"name":"International Symposium on Digital Earth","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114491214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A new climatic index for mapping world vegetation distribution","authors":"Yanling Sun, Peng Guo, Xiaodong Yan, G. Jia","doi":"10.1117/12.872321","DOIUrl":"https://doi.org/10.1117/12.872321","url":null,"abstract":"The proposed climatic index, named C value, is the coefficient of the third correlative equation that characterizes the dryness (or wetness) of climate, and the third correlative equation deals with heat and water balance related to evaporation. In this article, C value, mean temperature, and summer temperature are combined to predict the distribution of vegetation zones in world. The overall impression from examining the resulting vegetation map is that the location and distribution of vegetation zones in the world are predicted fairly well. Comparison between the predicted vegetation map and the Holdridge Life Zones map are made based on Kappa statistics, which indicates very significant agreement for the Ice/polar desert and Desert. Agreement is also significant for the categories of tundra, boreal forest, temperate mixed and deciduous forest, temperate steppe, subtropical mixed and deciduous forest, subtropical xerophytic woods/shrubs, tropical rain forest, tropical seasonal forest, tropical savanna, and tropical thorn woods/shrubs, even though much larger area of tundra and tropical thorn woods/shrubs were predicted compared to those on the Holdridge life zones map. The results show that C value has a strong correlation with vegetation distribution. As a climatic index, C value can be used for bioclimatic mapping at global scale.","PeriodicalId":417031,"journal":{"name":"International Symposium on Digital Earth","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115072350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel method of color image denoising based on the grey difference information principle","authors":"Zhikun Lai","doi":"10.1117/12.872948","DOIUrl":"https://doi.org/10.1117/12.872948","url":null,"abstract":"The grey system theory has recently been emerged as a powerful tool for image processing, image analysis and image understanding, such as, image compression, image denoising, image edge detection, image hiding, objects recognition and classification, image retrieval, image fusion and so on. However, these are mainly analyzed based on the technologies of grey model and grey relational analysis. The grey difference information principle is one of six basic principles of grey system theory. All there must be the difference in information, namely, the difference is the information. But so far the studies in image engineering based on this principle are rare. And image noise is exactly shown as the difference of image information. Therefore, the images are always corrupted by noises, which have a bad influence on the subsequent processing. Though some classical filters have successfully been used in gray scale imaging to remove impulsive noise, their extension to color images is not direct. The main difficulty is that an order has to be defined to sort the color vectors. In this paper, the grey difference information principle is applied to a novel valuable color image denoising strategy. Firstly, the grey difference information principle is introduced in detail including difference information sequence and difference information measure. Secondly, the basic idea of color image denoising is proposed based on the difference information principle, while the pixel difference information sequences are established in the light of the template types of filters and the properties of image noises. The novel method will select a suitable pixel, which has a minimum difference information synthesis measure in the predefined template window, to replace pixel of the noise. Lastly, the experiments are analyzed based on the novel method and the classical filters. The experimental results demonstrate that the proposed method outperforms the conventional mean filter in removing impulsive noise in color images. The successful application indicates that it is just as feasible and effective to use grey difference information principle as the technologies of grey model and grey relational analysis to process the color image.","PeriodicalId":417031,"journal":{"name":"International Symposium on Digital Earth","volume":"28 24","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120854839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-resolution Crop Surface Models (CSM) and Crop Volume Models (CVM) on field level by terrestrial laser scanning","authors":"D. Hoffmeister, A. Bolten, C. Curdt, G. Waldhoff, G. Bareth","doi":"10.1117/12.872315","DOIUrl":"https://doi.org/10.1117/12.872315","url":null,"abstract":"The interdisciplinary Transregional Collaborative Research Center 32 (CRC/TR 32) works on exchange processes between soil, vegetation, and the adjacent atmospheric boundary layer (SVA). Within this research project a terrestrial laser scanning sensor is used in a multitemporal approach for determining agricultural plant parameters. In contrast to other studies with phase-change or optical probe sensors, time-of-flight measurements are used. On three dates in the year 2008 a sugar beet field (4.3 ha) in Western Germany was surveyed by a terrestrial laser scanner (Riegl LMS-Z420i). Point clouds are georeferenced, trimmed, and compared with official elevation data. The estimated plant parameters are (i) surface model comparison between different crop surfaces and (ii) crop volumes as well as (iii) soil roughness parameters for SVA-Modelling. The results show, that the estimation of these parameters is possible and the method should be validated and extended.","PeriodicalId":417031,"journal":{"name":"International Symposium on Digital Earth","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121779803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The virtual reality 3D city of Ningbo","authors":"Weimin Chen, Dun Wu","doi":"10.1117/12.872841","DOIUrl":"https://doi.org/10.1117/12.872841","url":null,"abstract":"In 2005, Ningbo Design Research Institute of Mapping & Surveying started the development of concepts and an implementation of Virtual Reality Ningbo System (VRNS). VRNS is being developed under the digital city technological framework and well supported by computing advances, space technologies, and commercial innovations. It has become the best solution for integrating, managing, presenting, and distributing complex city information. VRNS is not only a 3D-GIS launch project but also a technology innovation. The traditional domain of surveying and mapping has changed greatly in Ningbo. Geo-information systems are developing towards a more reality-, three dimension- and Service-Oriented Architecture-based system. The VRNS uses technology such as 3D modeling, user interface design, view scene modeling, real-time rendering and interactive roaming under a virtual environment. Two applications of VRNS already being used are for city planning and high-rise buildings' security management. The final purpose is to develop VRNS into a powerful public information platform, and to achieve that heterogeneous city information resources share this one single platform.","PeriodicalId":417031,"journal":{"name":"International Symposium on Digital Earth","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125902439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three-dimensional visualization analysis for marine field data based on 3D-GIS","authors":"Xizhang Gao, Tao Zhang","doi":"10.1117/12.872840","DOIUrl":"https://doi.org/10.1117/12.872840","url":null,"abstract":"Considering large, complex and multi-dimensional marine field data, the general representation and analysis methods based on 2D GIS can not meet the requirements of Ocean Research. For multi-dimensional marine sampling data of sea water properties (ARGO sampling data, ship measured data, etc.), three dimensional interpolation and visual analysis methods can be used to reveal the distribution of sea water properties (such as temperature and salinity), and it is an effective way to detect regional anomaly of marine phenomenon. In order to handle three dimensional sampling data of sea water properties, this paper developed a three dimensional volume visualization analysis GIS component with OpenGL and C++. Three visualization analysis methods are designed and presented, including three-dimensional volume visualization, three dimensional slicing and cutting analysis and three-dimensional contour surface analysis. Example test is conducted, and the test result shows the proposed methods can be effectively used for ocean data analysis.","PeriodicalId":417031,"journal":{"name":"International Symposium on Digital Earth","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126629203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A method for calculating the serious degree of geological disaster in high vegetation covered region using remote sensing: a case of Minjiang basin from Moutuo to Xiao Shawan in Maoxian County","authors":"Qinjun Wang, Qizhong Lin, Liming Wang, Yu Chen, Dan Zhou","doi":"10.1117/12.873266","DOIUrl":"https://doi.org/10.1117/12.873266","url":null,"abstract":"In order to calculate the serious degree of geological disaster caused by earthquake taken place in Wenchuan county, Shichuan province, China with magnitude 8.0 on May 12th 2008, a method for extracting the changed vegetation using remote sensing taken the example of Minjiang basin from Moutuo to Xiao Shawan in Maoxian county, Shichuan province, China is proposed here. Because the study area has the characteristic of \"high vegetation cover\" (ratio of vegetation cover is 88.3% before earthquake takes place), changed vegetation can reflect the serious degree of geological disaster damage. Flow chart of this method is as following: Firstly, different spatial resolution between two images acquired before and after earthquake is uniformed and the two images are registered with accuracy less than one pixel; Then, vegetation changed map is made by extracting the difference area covered by vegetation in two images using Normalized Difference Vegetation Index (NDVI); Finally, statistics and analysis are performed according to the vegetation changed map. Results from vegetation changed map show that in the total area of 201.7 km2, vegetation changed area is 24.4 km2 in which 99.6% is caused by geological disaster with area of 24.3 km2, and the 0.4% left is caused by the change of farm operations. Therefore, changed vegetation in study area is mainly caused by geological disaster. According to geological map and high resolution images acquired by airborne remote sensing on May 23rd 2008, for \"high fragility and hardness\" of limestone, phyllite and quartzose sandstone in study area, the type of geological disaster is debris flow caused by slacktip.","PeriodicalId":417031,"journal":{"name":"International Symposium on Digital Earth","volume":"7841 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130624442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A method to construct instantaneous depth model based on a grid tidal model and chart data","authors":"Lihua Zhang, Chenghu Zhou, F. Su, Jun Xu, Zhu Wang","doi":"10.1117/12.873284","DOIUrl":"https://doi.org/10.1117/12.873284","url":null,"abstract":"Nowadays a depth delineated in a chart is a static depth based on the chart datum, whereas what the ship navigation should consider is an instantaneous depth, namely, the sum of the static depth and dynamic tide height. Aim to the shortage in depth representation, a method to construct an instantaneous depth model based on a grid tidal model and chart data is proposed. Firstly, a regional grid tide model around China is developed based on the Princeton ocean model (POM) using \"blending\" assimilation approach, and the continuous spatial-temporal tide heights are predicted. Secondly, the tide grids serving for all depths in the chart are determined, the depths are located efficiently in these grids and corresponding tide heights are obtained. Finally, Instantaneous depths are computed and displayed dynamically. Experimental results indicate that the proposed method is efficient for dynamic representation of instantaneous depths, and is also accurate for the representation in wide and plane sea areas.","PeriodicalId":417031,"journal":{"name":"International Symposium on Digital Earth","volume":"133 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128729397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Monitoring Chinese spring drought using time-series MODIS data","authors":"Liangyun Liu, L. Lei, Yanhong Wu, Quanjun Jiao","doi":"10.1117/12.873280","DOIUrl":"https://doi.org/10.1117/12.873280","url":null,"abstract":"From October of 2008 to February 2009, persistent drought weather hit most parts of northern China. The vegetation condition reflects the overall effect of rainfall, soil moisture, weather and agricultural practices. The remote sensing technique plays an important role in drought monitoring and early warning. In this article the author proposes a LAI anomaly index based on the MODIS 15A Products to monitor drought and predict yield. The historical average Leaf Area Index (LAI) images were derived using MODIS 15A Products from 2001 to 2007. The departure method was employed to calculate the anomaly index of LAI. And the LAI anomaly images were calculated from the MODIS 15A LAI products in spring, 2009. The LAI anomaly index was also designed to assess the drought degree. The spring drought index images in the 7 winter wheat provinces, including Heibei, He'nan, Shandong, Shan xi, Shan'xi, Anhui, Jiangsu, were mapped. The results showed that the spring drought was fiercely extended in the January along with the rapid rise of temperature and the regreening of winter crops, and also indicated the worst drought occurred in Henan province, Southwest Shandong, Guanzhong plateau in Shaanxi province, South Shanxi, North Jiangsu, North Anhui. However, the severe drought was also alleviated rapidly by the intensive and timely irrigation and the adequate rainfall from February to May, 2009. And the winter crops were successfully recovered since end of March (DOY 81) in most of the wheat product region. The predicted yield in most winter wheat product region was normal or better than normal level, and the spring drought resulted in small or bigger yield loss in some fields in south Shanxi, west Hebei, south-east Henan and Guangzhong Plateau Shaanxi.","PeriodicalId":417031,"journal":{"name":"International Symposium on Digital Earth","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131826563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The design and implementation of a global satellite image organization and web-based publication system","authors":"Jie Jiang, Rui Cao, Lingda Wu","doi":"10.1117/12.872688","DOIUrl":"https://doi.org/10.1117/12.872688","url":null,"abstract":"As satellite remote sensing information has gradually become an important data source and plays more and more important role in multi-domain, this paper does an in-depth study on global satellite remote sensing image data scheduling and publishing mechanism. It also design and implements a grid-based management and publication engine of satellite image data. For meeting the multi-request from clients with different access interface at the same time, the designed web-based high-effective general-purpose publication system is represented in the end.","PeriodicalId":417031,"journal":{"name":"International Symposium on Digital Earth","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130532313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}