Geographic Information Sciences最新文献

Spatial and Temporal Analysis of Rain Gauge Data and TRMM Rainfall Retrievals in Hong Kong 香港雨量计资料及TRMM雨量反演的时空分析

Geographic Information Sciences Pub Date : 2008-12-01 DOI: 10.1080/10824000809480645

Wing Fung James Wong, L. Chiu

引用次数: 14

Quantitative Detection of Area of Lakes in the West of China 中国西部湖泊面积的定量检测

Geographic Information Sciences Pub Date : 2008-12-01 DOI: 10.1080/10824000809480644

Ruixia Liu, Yujie Liu

引用次数: 0

Variations of Aerosol and Wet Deposition in Hong Kong: Preliminary Results 香港气溶胶和湿沉降的变化:初步结果

Geographic Information Sciences Pub Date : 2008-12-01 DOI: 10.1080/10824000809480643

L. Chiu, Kwok-cheung Lok

{"title":"Variations of Aerosol and Wet Deposition in Hong Kong: Preliminary Results","authors":"L. Chiu, Kwok-cheung Lok","doi":"10.1080/10824000809480643","DOIUrl":"https://doi.org/10.1080/10824000809480643","url":null,"abstract":"Abstract Examination of Air Pollution Index (API) for the period 2000–2007 in Hong Kong general monitoring stations showed a summer maximum in Kwai Chung and winter maximum in Yuen Long. There is an east-west asymmetry, with higher API in the western than the eastern part of Hong Kong, which is consistent with Aerosol Optical Depth(AOD) pattern derived from the NASA/Moderate Resolution Imaging Spectroradiometer (MODIS). Cross boarder transport of pollution in Hong Kong was examined by compiling API data according to daily prevailing wind directions. In winter, the API is significantly higher when the prevailing wind direction is northerly and significantly lower for southerly flows. Assuming the API during southerly flow is the in situ ambient API, the cross border transports are estimated to be 33% and 23%, respectively for summer and winter. Both the AOD and API showed increase from 2000 to 2004, followed by slight dip and increases again to a secondary maximum in 2007. The decline may be related to the adoption of environmental policies and laws in Hong Kong and in Pearl River Delta region for the period. The scavenging of aerosol by rain is examined using changes in daily API after rain days. Our result showed a significant negative correlation between percentage decrease in API and rain rate for the winter, however, no significant empirical relation exists for the summer. This may be related to dynamics of rain clouds which overwhelms the microphysical effects in summer and points to the use of finer scale, such as hourly data to quantify the scavenging effect.","PeriodicalId":331860,"journal":{"name":"Geographic Information Sciences","volume":"117 26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126417489","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}

引用次数: 2

Development and Application of Renewable Energy Map Analysis Program in the Philippines 菲律宾可再生能源地图分析程序的开发与应用

Geographic Information Sciences Pub Date : 2008-12-01 DOI: 10.1080/10824000809480648

C. Pascual, P. M. Pasion, Irma P. Acebedo, Fredelito I. Yadao, Norman Aguinaldo, E. Pascual

引用次数: 0

Study of Component Aerosol Direct Radiative Effect over the Asian Region 亚洲地区组分气溶胶直接辐射效应的研究

Geographic Information Sciences Pub Date : 2008-12-01 DOI: 10.1080/10824000809480641

T. Zhao

引用次数: 0

Seasonal Snow Monitoring in Northeast China Using Space-borne Sensors: Preliminary Results 基于星载传感器的东北地区季节积雪监测:初步结果

Geographic Information Sciences Pub Date : 2008-12-01 DOI: 10.1080/10824000809480646

K. Song, Yuanzhi Zhang, C. Jin, Suijun Yan, L. Chiu

引用次数: 6

Wind Field Variations in the Tropical Pacific Ocean from Satellite Scatterometer Data 基于卫星散射计资料的热带太平洋风场变化

Geographic Information Sciences Pub Date : 2008-12-01 DOI: 10.1080/10824000809480647

Ho Chung-ru, Zheng Zhe-wen, Lin Chun-yi, Kuo Nan-jung, Tsao Chih-chung

{"title":"Wind Field Variations in the Tropical Pacific Ocean from Satellite Scatterometer Data","authors":"Ho Chung-ru, Zheng Zhe-wen, Lin Chun-yi, Kuo Nan-jung, Tsao Chih-chung","doi":"10.1080/10824000809480647","DOIUrl":"https://doi.org/10.1080/10824000809480647","url":null,"abstract":"Abstract Satellite scatterometers have provided an opportunity to monitor wind fields in the world oceans. The sea surface wind stress data from ERS-1/2 and QuikSCAT scatterometers from 1993 to 2007 has been used to study the variation in the tropical Pacific Ocean by vector empirical orthogonal function (VEOF) method. The first VEOF mode shows an increase trend of planetary wind stress. The significantly increasing period is found from 1999 to 2000 when is the data transferred from ERS-2 to QuikSCAT. The consistence between ERS-1/2 and QuikSCAT winds during the overlap period from 1999 to 2000 is examined. The results show that there is a significant difference between the two datasets. The ERS-1/2 data is then adjusted to fit the wind data from QuikSCAT by least squares method. VEOF is then applied to the wind dataset again and no increasing trend is found in the first VEOF mode which is related to the trade winds. The second VEOF mode indicates the seasonal variation which is related to the East Asia monsoon. After removing the annual signal, the anomaly wind data are decomposed by VEOF again. The first mode shows the interannual variability which is highly related to E1 Niño/La Niña events.","PeriodicalId":331860,"journal":{"name":"Geographic Information Sciences","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116847905","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}

引用次数: 1

A New Algorithm for Retrieving Aerosol Optical Thickness Using TERRA/MODIS Satellite Images 基于TERRA/MODIS卫星影像反演气溶胶光学厚度的新算法

Geographic Information Sciences Pub Date : 2008-12-01 DOI: 10.1080/10824000809480642

M. Wong, J. Nichol, Kwonho Lee, Zhanqing Li

引用次数: 4

Using Multi-Scale Spatial Data in Landslide Mornitoring and Landuse Classification Interpretation 基于多尺度空间数据的滑坡监测与土地利用分类解译

Geographic Information Sciences Pub Date : 2008-06-01 DOI: 10.1080/10824000809480636

T. Chou, Chihheng Liu, M. Yeh, Yingchih Chen

{"title":"Using Multi-Scale Spatial Data in Landslide Mornitoring and Landuse Classification Interpretation","authors":"T. Chou, Chihheng Liu, M. Yeh, Yingchih Chen","doi":"10.1080/10824000809480636","DOIUrl":"https://doi.org/10.1080/10824000809480636","url":null,"abstract":"Abstract Owing to the rapid developments in the field of Geographic Information Systems and Remote Sensing techniques, various images sources have been widely available to identify ground changes information. Those commonly used multi-scale images provide the sources from macro to micro information and can be served as basic analysis platform in landslide monitoring and land use classification. Taiwan has a unique and vulnerable geological condition with potential disasters easily triggered by landslide occurrence due to typhoon and heavy precipitation each summer season. In order to identify and analyze those landslide information temporary and spatially, this research integrate satellite images, aerial survey data from aviation photography and LIDAR, and remotely controlled helicopter techniques to set up a diverse information network. Satellite images can fulfill the need for large area environmental inventory and land use classification. Digital Terrain Model generated by LIDAR and aerial photos can be used to mark the landslide area and estimate the size and volume. Remotely controlled helicopter can overcome the barriers of site accessibility and data transmitting simultaneously. This network then provides a less time and cost consuming platform by the idea of Grid methodology. The output from this research demonstrates the integration of heterogeneous data into a uniform communication interface to construct a thorough analysis mechanism. It is applicable and feasible to monitor the vegetation, terrain, and landscape changes through land use and land cover identification by multi-scale spatial data.","PeriodicalId":331860,"journal":{"name":"Geographic Information Sciences","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114680418","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}

引用次数: 0

Detecting Landscape Changes Pre-and Post Surface Coal Mining in Indiana, USA 检测美国印第安纳州露天采煤前后的地貌变化

Geographic Information Sciences Pub Date : 2008-06-01 DOI: 10.1080/10824000809480637

J. Yang

{"title":"Detecting Landscape Changes Pre-and Post Surface Coal Mining in Indiana, USA","authors":"J. Yang","doi":"10.1080/10824000809480637","DOIUrl":"https://doi.org/10.1080/10824000809480637","url":null,"abstract":"Abstract The objective of this study is to gain knowledge about landscape changes on surface coal mines following reclamation in southwestern Indiana, USA using satellite and airborne remote sensing. Three Landsat Thematic Mapper (TM) images acquired in 1989, 2000 and 2006 were used to map the land use/cover pre- and post-surface mining using both unsupervised and supervised classification algorithms. The post-classification comparison change detection algorithm was used to determine the land use/cover changes over time. A portable spectroradiometer was used so record reflectance spectra of vegetated surfaces in the field for calibration and training site selection. The land use/cover maps derived from satellite images were assessed using high-resolution color orthophoto and field-collected data. The overall accuracies for the 1989, 2000 and 2006 kind use/cover maps are 91, 90 and 85 percent with kappa statistic of 0.87, 0.86 and 0.80, respectively. Finally, a number of landscape metrics were calculated using FRAGSTATS to characterize pattern changes at the landscape level. The results indicated that the vegetation planted on the mined surfaces in the reclamation process were mainly croplands and grasses, while most of the forest land used for surface coal mining was not reclaimed to its original use.","PeriodicalId":331860,"journal":{"name":"Geographic Information Sciences","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131057302","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}

引用次数: 9