ID: 56595
Title: Impact of remotely sensed land - coer proportions on urban runoff prediction
Author: Tomasz Berezowski, Jaroslaw Chormanski, Okke Batelaan, Frank Canters, Tim Van de Voorde
Editor: Freek Van der Meer
Year: 2012
Publisher: Elsevier, Vol 16, June 2012
Source: Centre for Ecological Sciences
Reference: None
Subject: International Journal of Applied Earth Observation and Geoinformation
Keywords: Hydrological modeling, Land-cover, sub-pixel classification, impervious surfaces, high resolution imagery, landsat, Ikonos, urbanized catchment
Abstract: Land-cover impacts volume, intensity and contamination of runoff generated by rainfal events in catchments. This study demonstrates how the method used for estimation of land-cover proportions impacts the runoff from a distributed, physically based hydrological model-WetSpa. The study area is the urbanized catchment of Biala River, situated in the northeastern part of Poland. Three scenarios of landcover proportion estimation were tested: a semi-distributed approach where the average proportion of impervious surface cover per land-use type is estimated based on hard classification of a high-resolution IKONOS scene and two distributed approaches with land-cover class proportions estimated at the level of individual cells based on hard classification of a high-resolution IKONOS scene and sub-pixel classification of a medium-resolution Landsat 5 TM scene respectively. Validation of the three scenarios based on a comparison of modeled versus observed discharge shows that best results are obtained for the two distributed scenarios with a Nash-Sutcliffe efficiency (NS) of 0.62 for the hard classification approach and NS = 0.63 for the sub-pixel approach. The hard classification approach performed best in the estimation of peak discharges. The semi-distributed modeling scenario resulted in the lowest simulation efficiency (NS = 0.40) and did not perform well in estimating observed peak discharges. It is concluded that scenarios in which land-cover proportions are distributed improved considerably the simulationresults of hydrological process in physically based models.
Location: 231
Literature cited 1: None
Literature cited 2: None
ID: 56594
Title: Modeling land use interaction using linguistic variables
Author: Mohammad Karimi, Mohammad Ali Sharifi, Mohammad Saadi Mesgari
Editor: Freek Van der Meer
Year: 2012
Publisher: Elsevier, Vol 16, June 2012
Source: Centre for Ecological Sciences
Reference: None
Subject: International Journal of Applied Earth Observation and Geoinformation
Keywords: Land use interaction, Neighborhood effect, cellular automata, linguistic variables, GIS, expert knowledge
Abstract: One of the main factors of land use change (LUC) modeling is the land use intersection (LUI) or neighborhood effect, which is normally modeled using cellular automata (CA) concept. The effects of LUI over distance are represented in terms of CA transition rules. In this paper, a new model for LUI process is developed that makes use of expert knowledge to define the transition rules. In this model, the region of influence is defined using a new radial structure; the transition rules area described by expert knowledge and spatial metrics in the form of linguistic variables; and finally, the neighborhood effect is classified into three groups of compactness, dependency and incomparibility. The model is implemented and evaluated using the data of Borkhar and Meymeh township, in Esfahan, Iran, for the two periods of 1986-1998 and 1998-2005. The results show that the model and its related concept are performing rather well.
Location: 231
Literature cited 1: None
Literature cited 2: None
ID: 56593
Title: A differentiated approach to the seismic tomography problem: Method, testing and application to the Western Nagano fault area (Japan)
Author: Tatyana A Smaglichenko, Shigeki Horiuchi, Kaori Takai
Editor: Freek Van der Meer
Year: 2012
Publisher: Elsevier, Vol 16, June 2012
Source: Centre for Ecological Sciences
Reference: None
Subject: International Journal of Applied Earth Observation and Geoinformation
Keywords: Seismic tomography, Inversion problem, Seismic anisotropy, Statistical approach, fault area, Central Japan
Abstract: Results of tomographic inversion enrich our understanding of the geodynamic processes in the Earth. Seismic imaging of fault zones, the shear rupture permits us to investigate the structure under gas storage areas, in districts of large hydroelectric power stations, nuclear plants. The information about the geodynamic evolution of seismic structures in areas that are close to oceans helps us in assumption of epicenters of destructive earthquakes. A differentiated approach (DA) has been developed to overcome an interference of parameterizatin and observation errors distoring an accuracy of the three-dimensional tomography images. We have designed a method based upon revision of Gauss elimination scheme to the modern problem of large and sparse system of equations. The best linear unblashed estimations of seismic velocity parameter have been obtained by means of incorporating criterion. We used the statistical analyze to select optimal solution having minimal dispersion of parameterization error. In order to decrease a risk of a high error rate we applied the theory of Tikhonov regularization. Due to these measures the evaluated parameters of a medium possess isometric properties and thus for them the problem of seismic anisotropy has a real chance to be solved. By using a simple arbitrary model as well as a complex one for the fault region in Western Nagano, Japan, we demonstrated that the DA method is an effective alternative for the standard method. An application of DA to the real data underlines the high capability of DA of defining the fault planes as compared to the double-difference algorithm under the same condition of experiment. The detailed DA image suggests that the narrow rupture zone after the 1984 Naganoken-Seibu earthquake still exists.
Location: 231
Literature cited 1: None
Literature cited 2: None
ID: 56592
Title: Landscape change and hydrologic alteration associate with dam construction
Author: Qinghe Zhao, Shiliang Liu, Li Deng, Shikui Dong, Cong, Wang, Zhifeng Yang, Juejie Yang
Editor: Freek Van der Meer
Year: 2012
Publisher: Elsevier, Vol 16, June 2012
Source: Centre for Ecological Sciences
Reference: None
Subject: International Journal of Applied Earth Observation and Geoinformation
Keywords: Landscape change, hydrologic alteration, range of variability approach, dam construction, Lancang river
Abstract: Characterizing the landscape changes and hydrologica alterations associated with dam construction is very important for watershed management. This paper presents a case study of the Lancang River in Yunnan Province following dam construction. The landscape patterns and dynamics indicate the fragmentation, shape, and diversity of the river in 1980, 1990, and 2000. The Range of Variability Approach (RVA) is used to evaluate the degree of hydrologica alteration (DHA) using 44 years (1957 - 2000) of hydrologic data. The results indicate that the midstream and downstream landscapes were affected by dam construction, becoming more complex and fragmented during the 1980-2000 period; the upstream area was not influenced by dam construction and the reservior impoundment exhibited less change. The variability in maximum runoff coccurrence in the post-dam period was less than that in the pre-dam period. The integrated DHAs of the Jiuzhou (upstream), Gajiu (midstream), and Yunjinghong (downstream) stations were relatively low, reaching 26.28%, 33.40% and 37.14% respectively. However, the alteration became obvious in the midstream area, and the situation worsened when the river was simultaneously influenced by dam construction and other other human activities (downstream). The results of the regression analysis show strong relationships of landscape metric changes with DHA, and the forestland and water areas with DHA. The DHA increased along with the agrravation of landscape fragmentation, the complexity of the landscape shape, and the diversification of the landscape.
Location: 231
Literature cited 1: None
Literature cited 2: None
ID: 56591
Title: Prediction of bathymetry from satellite altimeter based gravity the Arabian sea: Mapping of two unnamed deep seamounts
Author: B Jena, P J Kurian, D Swain, A Tyagi, R Ravindra
Editor: Freek Van der Meer
Year: 2012
Publisher: Elsevier, Vol 16, June 2012
Source: Centre for Ecological Sciences
Reference: None
Subject: International Journal of Applied Earth Observation and Geoinformation
Keywords: Multibeam echosounder, Bathymetry, Satellite altimetry, ANN, Seamount
Abstract: This work attempts to predict bathymetry from satellite altimeter based gravity in the Arabian Sea. A col - located match-up database (n = 17.016) was created on Multibean Echosounder (MBES) bathymetry and satellite gravity values (~1min spatial resolution) derived from remote sensing satellites. A Radial Basis Function (RBF) based Artificial Neural Network (ANN) model was developed to predict bathymetry from satellite gravity values. The ANN model was trained with variable undersea features such as seamount, knoll, abyssal pain, hill, etc. to familiarize the network with all possible geomorphic features as inputs through learning and the corresponding target outputs. The performance of the predictive model was evaluated by comparing bathymetric values with MBES datasets that were not used during the training and verification steps of the ANN model formulation. The model was then compared with MBES surveyed seamount observations (those were not used during ANN anlaysis) and global model bathymetry products. Results demonstrate better performance of ANN model compared to global model products for mapping of two unnamed seamounts in the Arabian Sea. These two unnamed seamounts have been predicted, mapped and their morphology is reported for the first time through this work.
Location: 231
Literature cited 1: None
Literature cited 2: None
ID: 56590
Title: Geolocation - Lawmakers eye geolocation apps
Author: Kevin D Pomfret
Editor: Prof Arup Dasgupta
Year: 2011
Publisher: Geospatial Media and Communications Pvt. Ltd,Vol 02, Issue 01 August 2011
Source: Centre for Ecological Sciences
Reference: None
Subject: Geospatial World
Keywords: Geolocation technology,
Abstract: If it bleeds, it leads. So goes the cliche about the mainstream media. Little wonder, then, that news about the far-reaching economic and social benefits of geolocation technology tends to be overshadowed by stories like " Woman Sues Google for Showing Image of Underwear" (The Telegraph) or "How one App Sees Location Without Asking" (Wall Street Journal).
Location: 231
Literature cited 1: None
Literature cited 2: None
ID: 56589
Title: GNSS interference - The debate rages on
Author: Stephanie Wan
Editor: Prof Arup Dasgupta
Year: 2011
Publisher: Geospatial Media and Communications Pvt. Ltd,Vol 02, Issue 01 August 2011
Source: Centre for Ecological Sciences
Reference: None
Subject: Geospatial World
Keywords: Global Navigation Satellite Systems (GNSS)
Abstract: For the younger generation, ' GPS ' has become a ubiquitous term synonymous to how one can whip out their smart phone and simply ' Google ' for an answer. However, the term Global Navigation Satellite Systems (GNSS) is a topic that the general public knows very little about and would require a thorough search.
Location: 231
Literature cited 1: None
Literature cited 2: None
ID: 56588
Title: Vietnam: Catching up with g-revolution
Author: Deepali Roy
Editor: Prof Arup Dasgupta
Year: 2011
Publisher: Geospatial Media and Communications Pvt. Ltd,Vol 02, Issue 03, October 2011
Source: Centre for Ecological Sciences
Reference: None
Subject: Geospatial World
Keywords: Geospatial footprint
Abstract: Putting itself on the path of economic growth and development post the War. Vietnam is adopting modern technologies to be onpar with other South East Asian countries and is capitalising on the second mover advantage to evolve its geospatial footprint.
Location: 231
Literature cited 1: None
Literature cited 2: None
ID: 56587
Title: Malaysia : Towards spatially enabled society
Author: Deepali Roy
Editor: Prof Arup Dasgupta
Year: 2011
Publisher: Geospatial Media and Communications Pvt. Ltd,Vol 02, Issue 03, October 2011
Source: Centre for Ecological Sciences
Reference: None
Subject: Geospatial World
Keywords: None
Abstract: None
Location: 231
Literature cited 1: None
Literature cited 2: None
ID: 56586
Title: Thailand: Getting back on track
Author: Deepali Roy
Editor: Prof Arup Dasgupta
Year: 2011
Publisher: Geospatial Media and Communications Pvt. Ltd,Vol 02, Issue 03, October 2011
Source: Centre for Ecological Sciences
Reference: None
Subject: Geospatial World
Keywords: Geospatial Technology
Abstract: One of the early adopters of geospatial technology in South East Asia, Thailand has been steadily incorporating the technology in its various development activities. Here ' s a look at what ' s going on in the geospatial industry in Thailand.
Location: 231
Literature cited 1: None
Literature cited 2: None
ID: 56585
Title: Singapore: Geo-enabled ' government -with-you '
Author: Deepali Roy
Editor: Prof Arup Dasgupta
Year: 2011
Publisher: Geospatial Media and Communications Pvt. Ltd,Vol 02, Issue 03, October 2011
Source: Centre for Ecological Sciences
Reference: None
Subject: Geospatial World
Keywords: Geospatial technology
Abstract: Geospatial technology has played a significant role in Singapore ' s march into the league of developed nations within a short span of time. Not content to rest on the achievements so far, Singapore is actively implementing the technology to secure its growth.
Location: 231
Literature cited 1: None
Literature cited 2: None
ID: 56584
Title: Philippines: Poised for growth
Author: Sarah Hisham and Deepali Roy
Editor: Prof Arup Dasgupta
Year: 2011
Publisher: Geospatial Media and Communications Pvt. Ltd,Vol 02, Issue 03, October 2011
Source: Centre for Ecological Sciences
Reference: None
Subject: Geospatial World
Keywords: Geospatial technology
Abstract: With its aggressive economic growth and development plans and steadily growing awareness about he benfits of geospatial technology, especially its role in safeguarding the nation against the vagaries of nature, Philippines offers a lot of potential to the geospatial industry.
Location: 231
Literature cited 1: None
Literature cited 2: None
ID: 56583
Title: Indonesia : G-readiness for future
Author: Deepali Roy,
Editor: Prof Arup Dasgupta
Year: 2011
Publisher: Geospatial Media and Communications Pvt. Ltd,Vol 02, Issue 03, October 2011
Source: Centre for Ecological Sciences
Reference: None
Subject: Geospatial World
Keywords: Geospatial Information Act
Abstract: Shedding legacies and moving beyond ' business as usual ' mindset, Indonesia is accelerating its economic transformation and evolving a new way of working. It is strengthening traditional driver with new technologies and evolving infrastructure to carry the nation forward. Here ' s an insight into the geospatial scenario of a country which has recently approved the landmark Geospatial Information Act.
Location: 231
Literature cited 1: None
Literature cited 2: None
ID: 56582
Title: Information to the people
Author: Ron Bisio
Editor: Prof Arup Dasgupta
Year: 2012
Publisher: Geospatial Media and Communications Pvt. Ltd,Vol 02, Issue 10, May 2012
Source: Centre for Ecological Sciences
Reference: None
Subject: Geospatial World
Keywords: Public transport
Abstract: Tiny Singapore is strengthening public transport with GIS to meet the travel demands of increasing population.
Location: 231
Literature cited 1: None
Literature cited 2: None
ID: 56581
Title: Tech for the skies
Author: Deepali Roy
Editor: Prof Arup Dasgupta
Year: 2012
Publisher: Geospatial Media and Communications Pvt. Ltd,Vol 02, Issue 10, May 2012
Source: Centre for Ecological Sciences
Reference: None
Subject: Geospatial World
Keywords: Air traffic management
Abstract: With growing air traffic volumes, there is a lot of demand on air traffic management to manage the congestion on the runways and in the skies. Geospatial technology can help address this demand.
Location: 231
Literature cited 1: None
Literature cited 2: None