Enter records

ID: 50572
Title: A Conceptual Framework for the Simultaneous Extraction of Sub-Pixel Spatial Extent and Spectral Characteristics of Crops.
Author: Ben Somers, Stephanie Delalieux, illem W. Verstraeten, and Pol Coppin.
Editor: Russell G. Congaition
Year: 2009
Publisher: PE & RS PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING, January 2009, Volume 75, Number 1, James R. Plasker
Source: Centre for Ecological Science,Indian Institute of Science, Bangalore-12
Reference: None
Subject: PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING
Keywords: None
Abstract: The sub-pixel spectral contribution of background soils and shadows hampers the accurate site-specific monitoring of agriculture crop characteristics from aerial or satellite images. To address this problem, the present study combines measured in situ and hyperspectral data in an alternative unmixing algorithm. The proposed algorithm, reffered to as Soil Modeling Mixing Analysis (SMMA), incorporates a soil reflectance model in a traditional unmixing algorithm and as such opens up the oppertunity to simultaneously extract the sub-pixel spatial extent of crops as well as its pure spectral information. The performance of the algorithm is evaluated using a soil moisture for an in situ measured Albic Luvisol dataset. Synthetic mixtures, i.e., compiled from in situ-measured hyperspectral bare soil and citrus tree canopy spectra, were decomposed and the sub-pixel crop cover fractions (R2>0.94, RMSE<0.03) and pure vegetation signals (average extraction error 350 to 2,500 nnm = 0.017, RMSE = 0.02) were adequately extracted from the mixtures.
Location: 231
Literature cited 1: None
Literature cited 2: None

ID: 50571
Title: Accuracy Assessment of Digital Elevation Models based on Approximation Theory.
Author: Peng Hu, Xiaohang Liu, and Hai Hu.
Editor: Russell G. Congaition
Year: 2009
Publisher: PE & RS PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING, January 2009, Volume 75, Number 1, James R. Plasker
Source: Centre for Ecological Science,Indian Institute of Science, Bangalore-12
Reference: None
Subject: PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING
Keywords: None
Abstract: Empirical research in DEM accuracy assessment has observed that DEM errors are correlated with terrain morphology, sampling density, and interpolation method. However, theoretical reasons for these correlations have not been accounted for. This paper introduces approximation theory adapted from computational science as a new framework to assess the accuracy of DEMs interpolated from topographic maps. By perceiving DEM generation as a piecewise polynomial simulation of the unknown terrain, the overall accuracy of a DEM is described by the maximum error at any DEM point. Three linear polynomial interpolation methods are examined, namely linear interpolation in 1D, TIN interpolation, and bilinear interpolation in a rectangle. Their propagation error and interpolation error, whose sum is the total error at a DEM point, are derived. Based on the results, the theoretical basis for the correlation between DEM error and terrain morphology and source data density is articulated for the first time.
Location: 231
Literature cited 1: None
Literature cited 2: None

ID: 50570
Title: Understory Bamboo Discrimination Using a Winter Image.
Author: Tiejun Wang, Andrew K. Skidmore, Albertus G. Toxopeus, and Xuehua Liu
Editor: Russell G. Congaition
Year: 2009
Publisher: PE & RS PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING, January 2009, Volume 75, Number 1, James R. Plasker
Source: Centre for Ecological Science,Indian Institute of Science, Bangalore-12
Reference: None
Subject: PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING
Keywords: None
Abstract: In this study, a new approach is presented that combines forest phenology and Landsat vegetation indices to estimate evergreen understory bamboo coverage in a mixed temperate forest. It was found that vegetation indices, especially the normalized difference vegetation index (NDVI) derived from leaf-off (winter) images were significantly correlated with percent understory bamboo cover for both deciduous and mixed coniferous / deciduous forests. Winter NDVI was used to map bamboo coverage using a binary decision tree classifier. A high mapping accuracy for understory bamboo presence / absence was achieved with an overall accuracy of 89 percent (k=0.59). In addition, for the first time, we successfully classified three density classes of bamboo with an overall accuracy of 68 percent (k=0.48). These results were compared to three traditional multispectral bands based methods (Mahalanobis distance likelihood, and artificial neural networks). The highest mapping accuracy was again obtained from winter images. However, the kappa z-test showed that there was no statistical difference in accuracy between the methods. The results suggest that winter is the optimal season for quantifying the coverage of evergreen understory bamboos in a mixed forest area, regardless of the classification methods use.
Location: 231
Literature cited 1: None
Literature cited 2: None

ID: 50569
Title: Automated 3D Forest Surface Model Extraction from Balloon Stereo Photographs
Author: Keiji Kushida, Kunihiko Yoshino, Toshihide Nagano, and Tomoyasu Ishida
Editor: Russell G. Congaition
Year: 2009
Publisher: PE & RS PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING, January 2009, Volume 75, Number 1, James R. Plasker
Source: Centre for Ecological Science,Indian Institute of Science, Bangalore-12
Reference: None
Subject: PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING
Keywords: None
Abstract: We upgraded an automated forest digital surface model (DSM) extraction method from balloon stereo photographs of a tropical peat swamp forest in Narathiwat, Thailand by evaluating the image matching and forest surface height (FSH) estimation. We modified an image correlation matching method based on the characteristics of the tree crown shapes. The mismatched area was less than 3 percent of the total area. We estimated an FSH map in a 60 m x 60 m plot by both estimation and field measurement, and set the unit area for FSH averaging at 10 m x 10 m. The root mean square of the differences between the mean photo-estimated and mean field-measured FSH was 3.8 m, which was revised to 1.9 m when the forest gaps were extracted offline. These difference were within a reasonably practical range since the range of the range of the mean field-measured FSH was 10.0 to 21.4 m.
Location: 231
Literature cited 1: None
Literature cited 2: None

ID: 50568
Title: Hot spot : biomass in Australia.
Author: None
Editor: Dr. Volker Buddensiek
Year: 2009
Publisher: SUN & WIND ENERGY, THE MAGAZINE for Renewable Energies, 2/2009, Prof. Dr. Bernhard von Schubert, BVA Bielefelder Verlag GmbH & Co. KG.
Source: Centre for Ecological Science,Indian Institute of Science, Bangalore-12
Reference: None
Subject: None
Keywords: None
Abstract: None
Location: 241
Literature cited 1: None
Literature cited 2: None

ID: 50567
Title: Latin America : The boom is just begining
Author: None
Editor: Dr. Volker Buddensiek
Year: 2009
Publisher: SUN & WIND ENERGY, THE MAGAZINE for Renewable Energies, 2/2009, Prof. Dr. Bernhard von Schubert, BVA Bielefelder Verlag GmbH & Co. KG.
Source: Centre for Ecological Science,Indian Institute of Science, Bangalore-12
Reference: None
Subject: None
Keywords: None
Abstract: None
Location: 241
Literature cited 1: None
Literature cited 2: None

ID: 50566
Title: Austria : Ambitious targets in the Alpine republic
Author: None
Editor: Dr. Volker Buddensiek
Year: 2009
Publisher: SUN & WIND ENERGY, THE MAGAZINE for Renewable Energies, 2/2009, Prof. Dr. Bernhard von Schubert, BVA Bielefelder Verlag GmbH & Co. KG.
Source: Centre for Ecological Science,Indian Institute of Science, Bangalore-12
Reference: None
Subject: None
Keywords: None
Abstract: None
Location: 241
Literature cited 1: None
Literature cited 2: None

ID: 50565
Title: From the rockets stove to a mini gasworks
Author: None
Editor: Dr. Volker Buddensiek
Year: 2009
Publisher: SUN & WIND ENERGY, THE MAGAZINE for Renewable Energies, 1/2009, Prof. Dr. Bernhard von Schubert, BVA Bielefelder Verlag GmbH & Co. KG.
Source: Centre for Ecological Science,Indian Institute of Science, Bangalore-12
Reference: None
Subject: None
Keywords: None
Abstract: None
Location: 241
Literature cited 1: None
Literature cited 2: None

ID: 50564
Title: The most important wind energy trade shows worldwide.
Author: None
Editor: Dr. Volker Buddensiek
Year: 2009
Publisher: SUN & WIND ENERGY, THE MAGAZINE for Renewable Energies, 1/2009, Prof. Dr. Bernhard von Schubert, BVA Bielefelder Verlag GmbH & Co. KG.
Source: Centre for Ecological Science,Indian Institute of Science, Bangalore-12
Reference: None
Subject: None
Keywords: None
Abstract: None
Location: 241
Literature cited 1: None
Literature cited 2: None

ID: 50563
Title: Large-scale PV plants : mega financiang for megawatts
Author: None
Editor: Dr. Volker Buddensiek
Year: 2009
Publisher: SUN & WIND ENERGY, THE MAGAZINE for Renewable Energies, 1/2009, Prof. Dr. Bernhard von Schubert, BVA Bielefelder Verlag GmbH & Co. KG.
Source: Centre for Ecological Science,Indian Institute of Science, Bangalore-12
Reference: None
Subject: None
Keywords: None
Abstract: None
Location: 241
Literature cited 1: None
Literature cited 2: None

ID: 50562
Title: PV industry : Women on the job
Author: None
Editor: Dr. Volker Buddensiek
Year: 2009
Publisher: SUN & WIND ENERGY, THE MAGAZINE for Renewable Energies, 1/2009, Prof. Dr. Bernhard von Schubert, BVA Bielefelder Verlag GmbH & Co. KG.
Source: Centre for Ecological Science,Indian Institute of Science, Bangalore-12
Reference: None
Subject: None
Keywords: None
Abstract: None
Location: 241
Literature cited 1: None
Literature cited 2: None

ID: 50561
Title: Greece : Bright perspectives in Hellas
Author: None
Editor: Dr. Volker Buddensiek
Year: 2009
Publisher: SUN & WIND ENERGY, THE MAGAZINE for Renewable Energies, 1/2009, Prof. Dr. Bernhard von Schubert, BVA Bielefelder Verlag GmbH & Co. KG.
Source: Centre for Ecological Science,Indian Institute of Science, Bangalore-12
Reference: None
Subject: None
Keywords: None
Abstract: None
Location: 241
Literature cited 1: None
Literature cited 2: None

ID: 50560
Title: This tale of growth is not a fairy tale.
Author: None
Editor: Dr. Volker Buddensiek
Year: 2009
Publisher: SUN & WIND ENERGY, THE MAGAZINE for Renewable Energies, 1/2009, Prof. Dr. Bernhard von Schubert, BVA Bielefelder Verlag GmbH & Co. KG.
Source: Centre for Ecological Science,Indian Institute of Science, Bangalore-12
Reference: None
Subject: None
Keywords: None
Abstract: None
Location: 241
Literature cited 1: None
Literature cited 2: None

ID: 50559
Title: Wind energy hung up in the queue
Author: None
Editor: Dr. Volker Buddensiek
Year: 2009
Publisher: SUN & WIND ENERGY, THE MAGAZINE for Renewable Energies, 1/2009, Prof. Dr. Bernhard von Schubert, BVA Bielefelder Verlag GmbH & Co. KG.
Source: Centre for Ecological Science,Indian Institute of Science, Bangalore-12
Reference: None
Subject: None
Keywords: None
Abstract: None
Location: 241
Literature cited 1: None
Literature cited 2: None

ID: 50558
Title: Bio-methane plant : on a good path
Author: None
Editor: Dr. Volker Buddensiek
Year: 2008
Publisher: SUN & WIND ENERGY, THE MAGAZINE for Renewable Energies, 6/2008, Prof. Dr. Bernhard von Schubert, BVA Bielefelder Verlag GmbH & Co. KG.
Source: Centre for Ecological Science,Indian Institute of Science, Bangalore-12
Reference: None
Subject: None
Keywords: None
Abstract: None
Location: 241
Literature cited 1: None
Literature cited 2: None