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Revision as of 07:25, 4 November 2014

B. S. Daya Sagar
File:Sagar-Lecture-SIRARM.jpg
Sagar in 2009.
Born1967
India
Citizenship India
Alma materAndhra University College of Engineering
OccupationAcademic / Scientist
Awards
Scientific career
FieldsMathematical Morphology
Mathematical Geosciences
Fractals
Geographical Information Science
InstitutionsIndian Statistical Institute-Bangalore Centre
Multimedia University
National University of Singapore
Andhra University College of Engineering
Doctoral advisorsB. S. Parakasa Rao and SVLN Rao
Doctoral studentsTay Lea Tien[1]
Alan Tan Wee-Chiat[2]>
Teo Lay Lian[3]
Chockalingam
Radhakrishnan[4]
Lim Sin Liang[5]
Websitehttp://www.isibang.ac.in/~bsdsagar

B S Daya Sagar (born in 1967 in India) is an Indian Academic and a Mathematical Geoscientist working as an Associate Professor at the Systems Science and Informatics Unit, Indian Statistical Institute-Bangalore Centre. He is known as one of today's pioneers whose focus is on mathematical morphology, fractal geometry. chaos theory, and their applications in geophysics, geographical information science, and computational geography.

Education

Daya Sagar had his school and collegiate education at St Anthony School-Visakhapatnam, Government High School-Samalkota, Government Arts College-Srikakulam, India. He graduated with BSc in 1987 from Shree Durga Prasad Saraf College of Arts and Applied Sciences-Sriramnagar, an affiliated college of Andhra University. Subsequently, he received the M.Sc and PhD degrees from the Andhra University College of Engineering-Visakhapatnam, India, in 1991 and 1994 respectively. His PhD thesis is on 'Applications of Remote Sensing, Mathematical Morphology, and Fractals to Study Certain Surface Water Bodies'.

Career

Sagar currently is an Associate Professor at Systems Science and Informatics Unit (SSIU) of Indian Statistical Institute—Bangalore Centre, India. Earlier (1991-1998), he worked in Andhra University College of Engineering as a project assistant (1991–92) in a project 'PC-Based Image Processing System' funded by Ministry of Human Resource Development at Department of Geoengineering, Andhra University College of Engineering, a Senior Research Fellow (1992–94) of Council of Scientific and Industrial Research (CSIR), a Research Associate (1994–95) of CSIR, a Research Scientist/Principal Investigator (1997-7) in a Scheme for Extramural Research for Young Scientists funded by Ministry of Science and Technology, a Senior Research Associate (1998-98) of CSIR. From 1998-2001, he worked as a Grade-A Research Scientist at the Centre for Remote Imaging Sensing and Processing (CRISP), the National University of Singapore. He was appointed Associate Professor of Faculty of Engineering and Technology, the Multimedia University, Malaysia in 2001. He was also a Deputy Chairman of Centre for Applied Electromagnetics (2003–07) at the Multimedia University, Malaysia. Since 2007, he has been an Associate Professor at Indian Statistical Institute-Bangalore centre, and since 2009, he has been overseeing as founding head of Systems Science and Informatics Unit, a unit that was established in 2009 as one of the five constituent units of Computer and Communication Sciences Division of Indian Statistical Institute.

Research

Daya Sagar’s two-decade long unique research contributions span both basic and applied fields involves fusion of computer simulations and modeling techniques with a goal of developing cogent models in discrete space to gain a significantly good understanding of the dynamical behaviors of complex terrestrial systems (e,g: water bodies, river networks, mountain objects, folds, dunes, landscapes, rock porous medium, epidemic etc). Efficient way of understanding the dynamical behavior of many complex systems of nature, society and science is possible through data acquired at multiple spatial and temporal scales. The utility and application of such data for developing cogent domain-specific models that provide the spatiotemporal behaviors of systems of geoscientific relevance could be substantially enhanced through related technologies and spatial algorithms developed by him. His works can be singled out as significant contributions whereby the concepts stemmed out of recent theories—such as mathematical morphology, fractals, chaos, and morphometrics—have been employed to develop spatial algorithms eventually used in (i) pattern retrieval, (ii) pattern analysis, (iii) simulation and modeling, and (iv) reasoning and visualization of the spatial and/or temporal phenomena of terrestrial and GISci relevance.

There has been a long–standing interest in an analytical understanding and retrieval of unique terrestrial networks. Sagar has put forward several novel algorithms for the simultaneous extraction of channel and ridge networks by introducing geometrical vision via mathematical morphology. These algorithms not only can be generalized to solve fundamental problems that have plagued algorithms for extracting terrestrial networks for over three decades. In a series of papers he proved that one can retrieve terrestrial networks from both hilly and non-hilly regions with very high precision than that of those flow direction-based techniques. Terrestrial characterization techniques proposed during 1990-2005 yield scale-invariant power-laws that exhibit self-organizing characters. He has shown the evidence of self-organization in several terrestrial phenomena and processes via scaling laws, and has observed their limited utility in finding out basic distinction between the geomorphologic basins possessing topologically invariant networks. Based on such an observation, he has developed for the first time a methodology that yields scale-invariant but shape-dependent power-laws for better terrestrial analysis. In sequel papers, he proposed morphological techniques that provide scale-invariant but shape-dependant power-laws. He has developed Fractal-Skeletal Channel Network model that can exhibit various empirical features that the random model cannot. Through discrete simulations based on interplay between numeric and graphic analyses, he has shown various behavioral phases that terrestrial systems traverse. His comprehensive monograph (Mathematical Morphology in Geomorphology and GISci,[6] CRC Press: Boca Raton, 2013, p. 546) is a must read for researchers in this area. This contribution—highlighted numerous cases of relevance to quantitative terrestrial morphology, and spatial informatics—explained via physics-based models. Of late, he developed mathematical morphology-based algorithms (i) for spatial interpolation that can solve problems, of global nature, in spatial-temporal GISci, (ii) to convert point-data into contiguous zonal map for better visualization, (iii) to solve a problem of identifying strategic location among a cluster of zones, (iv) to construct cartograms that are free from global shape-errors, and to great extent with lesser local shape and area errors, and (v) to obtain asymmetrical level of interactions between the zones via a modified gravity model that fixes long-standing problem in modeling the variable-specific interaction—closer to reality than traditional gravity-based models. His work that has spurred interdisciplinary activity has implications and has yielded insights for geosciences and spatiotemporal GISci.

His studies also show that there exist several open challenges that need to be addressed by mathematical geosciences community. One of such challenges is to understand the complexity in spatiotemporal behaviors of several terrestrial phenomena and processes via construction of process-specific attractors that may range from simple to strange. His research aims at effectively attaining these goals that presents many computational challenges that need development of efficient frameworks and associated algorithms. He delivers lectures on these topics widely both in India and abroad.

Professional

Sagar has been honored with awards such as Georges Matheron Lectureship Award of International Association for Mathematical Geosciences 'for outstanding research ability in the field of spatial statistics or mathematical morphology'. In 2002 he received Krishnan Medal of the Indian Geophysical Union. As recipient of this medal, Sagar was made IGU Fellow in 2011. In 1995, he received Dr. Balakrishna Memorial Award from the Regional Centre of Andhra Pradesh Akademi of Sciences. He is an elected Fellow of Royal Geographical Society (1999), Fellow of Indian Geophysical Union (2011), Senior Member of IEEE (2003) and was a member of New York Academy of Science during 1995-96. He is on the Editorial Boards of Discrete Dynamics of Nature and Society, and Computers & Geosciences.

He has published 60+ papers in peer reviewed international journals, 2 books, and 7 edited Special-Theme issues for well known journals.[7] The two books he has written include Mathematical Morphology in Geomorphology and GISci (CRC Press: Boca Raton, 2013, p. 546), and Qualitative Models of Certain Discrete Natural Features of Drainage Environment (Allied Publishers: New Delhi, 2005, p. 231). He acted as Guest-Editor for special issues on Filtering and Segmentation with Mathematical Morphology (with Laurent Najman, Junior Barrera, Petros Maragos, and Dan Schonfeld) for IEEE Journal of Selected Topics in Signal Processing (v. 6, no. 7, p. 736-886, 2012), “Spatial Information Retrieval, Analysis, Reasoning and Modelling” (with Jean Serra) for International Journal of Remote Sensing (v. 31, no. 22, p. 5747-6032, 2010), Surficial Mapping for IEEE Geoscience and Remote Sensing Letters (v. 2, no. 4, p. 375-408, 2005, Fractals in Geophysics (with G. Rangarajan and Daniele Veneziano) for Chaos Solitons & Fractals (v. 19, no. 2, p. 237-462, 2004), Quantitative Image Morphology (with C. Babu Rao) for International Journal Pattern Recognition and Artificial Intelligence (v. 17, no. 2 p. 163-330, 2003), and In Memory of the Late Professor SVLN Rao for Mathematical Geology (v. 33, no.3, p. 245-396, 2001). He has been on Editorial Boards of Computers and Geosciences and Discrete Dynamics in Nature & Society.

Selected Publications

Terrestrial Pattern Retrieval

  • "Morphological operators to extract channel networks from Digital Elevation Models," B. S. D. Sagar, M. Venu and D. Srinivas, International Journal of Remote Sensing, 2000, Vol. 21, No. 1, pp. 21–30, 2000.
  • "Automatic generation of sub-watershed map from Digital Elevation Model: a morphological approach," L. Chockalingam and B. S. D. Sagar, International Journal of Pattern Recognition and Artificial Intelligence, Vol. 17, No. 2. p. 269-274, 2003.
  • "Morphological approach to extract ridge-valley connectivity networks from Digital Elevation Models (DEMs)," B. S. D. Sagar, M. B. R. Murthy, C. Babu Rao and Baldev Raj, International Journal of Remote Sensing, Vol. 24, No. 3, pp. 573–581, 2003.
  • "Reconstruction of pore space from pore connectivity network via morphological transformations," Teo Lay Lian and B. S. D. Sagar, Journal of Microscopy (Oxford), Vol. 219, Pt 2, pp. 76–85, 2005.
  • "Cloud field segmentation via multiscale convexity analysis," Lim Sin Liang and B. S. Daya Sagar, Journal of Geophysical Research-Atmospheres, 113, D13208, 2008.

Terrestrial Pattern Analysis

  • "Fractal relations of a morphological skeleton," B. S. D. Sagar, Chaos, Solitons & Fractals, Vol. 7, No. 11, pp. 1871–1879, 1996.
  • "Universal scaling laws in surface water bodies and their zones of influence," B. S. D. Sagar, Water Resources Research, Vol. 43, No. 2, W02416, 2007.
  • "Allometric relationships between travel-time channel networks, convex hulls, and convexity measures," L. T. Tay, B. S. D. Sagar and H. T. Chuah, Water Resources Research, Vol. 46, No.2, W06502.
  • "Modeling, Characterization of Pore-channel, throat and body," L. L. Teo and B. S. D. Sagar, Discrete Dynamics in Nature and Society, Vol. 2006, Article ID 89280, pp. 1–24.
  • "Fractal dimension of non-network space of a catchment basin," B. S. D. Sagar and L. Chockalingam, Geophysical Research Letters, Vol.31, No.12, L12502, 2004.
  • "Allometric power-law relationships in a Hortonian Fractal DEM," B. S. D. Sagar, and Tay Lea Tien, Geophysical Research Letters, Vol. 31, No. 6, L06501, 2004.
  • "Morphometry of networks and non-network spaces," L. Chockalingam and B. S. D. Sagar, Journal of Geophysical Research-Solid Earth, Vol. 110, B08203, 2005.
  • "Granulometric analysis of basin-wise DEMs: a comparative study," L. T. Tay, B. S. D. Sagar and H. T. Chuah, International Journal of Remote Sensing, Vol. 28, No. 15, pp. 3363–3378, 2007.
  • "Derivation of geodesic flow fields and spectrum in digital topographic basins," S. L. Lim and B. S. D. Sagar, Discrete Dynamics in Nature and Society. Vol. 2008 (2008), Article ID 312870, 26 pages, 2008.

Modeling and Simulation

  • "Fractal skeletal based channel networks in a triangular initiator basin," B. S. D. Sagar, D. Srinivas, B. S. P. Rao, Fractals, Vol. 9, No. 4. pp. 429–437, 2001.
  • "Morphological description and interrelationship between force and structure: a scope to geomorphic evolution process modelling," B. S. D. Sagar, M. Venu, G. Gandhi, and D. Srinivas, International Journal of Remote Sensing, Vol. 19, No. 7, pp. 1341–1358, 1998.
  • "Ranking of Lakes: Logistic maps," B. S. D. Sagar and B. S. P. Rao, International Journal of Remote Sensing, Vol. 16, No. 2, pp. 368–371, 1995.
  • "Discrete simulations of spatio-temporal dynamics of small water bodies under varied streamflow discharges," B. S. D. Sagar, Nonlinear Processes in Geophysics, Vol. 12, pp. 31–40, 2005.
  • "Numerical simulations through first order nonlinear difference equation to study highly ductile symmetric fold (HDSF) dynamics: a conceptual study," B. S. D. Sagar, Discrete Dynamics in Nature and Society, Vol. 2, No. 4, pp. 281–298, 1998.
  • "Morphological evolution of a pyramidal sandpile through bifurcation theory: a qualitative model," B. S. D. Sagar, Chaos, Solitons & Fractals, Vol.10, No 9. pp. 1559–1566, 1999.
  • "Avalanches in numerically simulated sand dune dynamics," B. S. D. Sagar, M. B. R. Murthy, and P. Radhakrishnan, Fractals, Vol. 11, No. 2, p. 183-193, 2003.

Spatial Reasoning

  • "Metric based on morphological dilation for the detection of spatially significant zones," B. S. D. Sagar, N. Rajesh, S. A. Vardhan, and P. Vardhan, IEEE Geoscience and Remote Sensing Letters, Vol. 10, No. 3, pp. 500–504, 2013.
  • "Automatic detection of orientation of mapped units via directional granulometric analysis," S. A. Vardhan, B. S. D. Sagar, N. Rajesh, and H. M. Rajashekara, IEEE Geoscience and Remote Sensing Letters, Vol. 10, No. 6, pp. 1449–1453, 2013.

Visualization

  • "Generation of fractal landscape using nonlinear mathematical morphological transformations," B. S. D. Sagar and K S R Murthy, Fractals, Vol. 8, No. 3, pp. 267–272, 2000.
  • "Visualization of spatiotemporal behavior of discrete maps via generation of recursive median elements," B. S. D. Sagar, IEEE Transactions on Pattern Analysis and Machine Intelligence, Vol. 32, No. 2, pp. 378–384, 2010.
  • "Generation of zonal map from point data via weighted skeletonization by influence zone," H. M. Rajashekhara, P. Vardhan, and B. S. D. Sagar, IEEE Geoscience and Remote Sensing Letters, Vol. 9, No. 3, pp. 403–407, 2012.
  • "Cartograms via mathematical morphology," B. S. D. Sagar, Information Visualization, Vol. 13, No. 1, pp. 42–58, 2014.

Books

  • B. S. Daya Sagar, Mathematical Morphology in Geomorphology and GISci, CRC Press: Boca Raton, p. 546, 2013.[8][9][10][11][12][13]
  • B. S. Daya Sagar, Qualitative Models of Certain Discrete Natural Features of Drainage Environment, Allied Publishers: New Delhi, p. 231, 2005.[18]
  • (Guest Editor: B. S. Daya Sagar), Special issue In Memory of the Late Professor SVLN Rao, Mathematical Geology, v. 33, no.3, p. 245-396, 2001.[22][23]

Honors and Awards

  • CURZONCO-SESHACHALAM LECTURES-5(2009)[26][27]
  • Dr. Balakrishna Memorial Award 1995 from Regional Centre of Andhra Pradesh Akademi of Sciences
  • Editor of Discrete Dynamics in Nature and Society: Multidisciplinary Research and Review Journal[28]
  • Editorial Board Member, Computers & Geosciences[29]
  • Founding Chairman, Bangalore Section IEEE Geoscience and Remote Sensing Chapter[30][31]

Professional Activities

  • Workshop on "Mathematical Morphology and Pattern Recognition: Theory and Applications" 26–28 March 2013 Bangalore, India.[32]
  • Five-Day course on "Spatial Statistical Tools in Data Processing and Analysis", 26-30 Nov 2012, Bangalore, India.[33]
  • Workshop on 'Advanced Methods in Spatial Data Processing and Analysis', 6–7 March 2012, Bangalore, India.[34]
  • Workshop 'Honoring Jean Serra' 25–26 October 2010, Bangalore, India.[35]
  • Four-Day course on "Mathematical Morphology in Image Analysis, Geomorphology, and GISci', 19-23 Oct 2010, Bangalore, India.[36]
  • International Seminar of Spatial Information Retrieval Analysis, Reasoning and Modelling (SIRARM), 18–20 March 2009, Bangalore, India.[37]

References

  1. ^ http://ee.eng.usm.my/v4/index.php/our-people/academic-staff/124-dr-tay-lea-tian
  2. ^ http://fet.mmu.edu.my/v4/staff/wctan.htm
  3. ^ http://fet.mmu.edu.my/v4/staff/llteo.htm
  4. ^ http://www.radhakrishnan.4t.com/
  5. ^ http://foe.mmu.edu.my/v3/main/staff/staff_profile.php?params=ajyDv7vYdwxUGZspiVbBIERTPf8uGoK0w4QzcwgyvKU
  6. ^ B.S. Daya Sagar. Mathematical Morphology in Geomorphology and GISci, 2013, p.546. CRC Press, Boca Raton. Retrieved 2014-09-06.
  7. ^ "Sagar: ResearcherID of Thomson Reuters". Retrieved 2014-09-19.
  8. ^ B.S. Daya Sagar. Mathematical Morphology in Geomorphology and GISci, 2013, p.546. CRC Press, Boca Raton. Retrieved 2014-09-06.
  9. ^ B.S. Daya Sagar. "Mathematical Morphology in Geomorphology and GISci, 2013, p.546". CRC Press, Boca Raton.
  10. ^ "Editorial Reviews on Mathematical Morphology in Geomorphology and GISci". Retrieved 2014-09-07.
  11. ^ "Book Review on Mathematical Morphology in Geomorphology and GISci, ACM Computing Reviews, Reviewer: Jose Manuel Palomares Munoz". Retrieved 2014-09-18.
  12. ^ "Book Review on "Mathematical Morphology in Geomorphology and GISci", Reviewer: Nigel Waters, Geomatica, v. 67, no. 4, p. 283-284, 2013".
  13. ^ "Book Review on "Mathematical Morphology in Geomorphology and GISci", Reviewer: Serge Beucher, Mathematical Geosciences, DOI: 10.1007/s11004-014-9569-3, Published Online 25 October 2014".
  14. ^ "Special Issue: Filtering and Segmentation with Mathematical Morphology, IEEE Journal of Selected Topics in Signal Processing, v. 6, no. 7, p. 736-886, 2012". {{cite web}}: Unknown parameter |editors= ignored (|editor= suggested) (help)
  15. ^ Special Issue: Spatial Information Retrieval, Analysis, Reasoning and Modelling, Volume 31, Issue 22 of International Journal of Remote Sensing. {{cite book}}: Unknown parameter |editors= ignored (|editor= suggested) (help)
  16. ^ "Special Issue on Spatial Information Retrieval, Analysis, Reasoning and Modelling, International Journal of Remote Sensing, v. 31, no. 22, p. 5747-6032, 2010". Taylor & Francis. {{cite web}}: Unknown parameter |editors= ignored (|editor= suggested) (help)
  17. ^ B.S. Daya Sagar (ed.). "Special Section: Surficial Mapping, IEEE Geoscience and Remote Sensing Letters, v. 2, no. 4, p. 375-408, 2005".
  18. ^ B.S. Daya Sagar. Qualitative Models of Certain Discrete Natural Features of Drainage Environment, 2005, Pages 231. Allied Publishers, New Delhi.
  19. ^ "Special Issue: Fractals in Geophysics, Chaos Solitons & Fractals, v. 19, no. 2, p. 237-462, 2004". {{cite web}}: Unknown parameter |editors= ignored (|editor= suggested) (help)
  20. ^ Special Issue: Quantitative Image Morphology. {{cite book}}: Unknown parameter |editors= ignored (|editor= suggested) (help)
  21. ^ "Special Issue on Quantitative Image Morphology, International Journal Pattern Recognition and Artificial Intelligence, v. 17, no. 2 p. 163-330, 2003". {{cite web}}: Unknown parameter |editors= ignored (|editor= suggested) (help)
  22. ^ BS Daya Sagar (ed.). Special Issue: In Honor of Professor Sonti Venkata Lakshmi Narasimha Rao, Volume 33, Issue 3 of Mathematical Geology, 2001.
  23. ^ B.S. Daya Sagar (ed.). "Special Issue: In Memory of the Late Professor SVLN Rao, Mathematical Geosciences v. 33, no.3, p.245-396, 2001".
  24. ^ "Georges Matheron Award Photos" (PDF). Retrieved 2014-08-30.
  25. ^ "IAMG Newsletter No 82 May, Page 4;" (PDF). 2011-05-01. Retrieved 2014-08-25.
  26. ^ "CURZONCO-SESHACHALAM LECTURES-5(2009)-Announcement". Retrieved 2014-09-08.
  27. ^ "CURZONCO-SESHACHALAM LECTURES-5(2009)". Retrieved 2014-09-08.
  28. ^ "Discrete Dynamics in Nature and Society-Editorial Board". Retrieved 2014-09-07.
  29. ^ "Computers & Geosciences-Editorial Board". Retrieved 2014-09-07.
  30. ^ "Bangalore Section IEEE GRSS Chapter-Homepage". Retrieved 2014-09-07.
  31. ^ "Bangalore Section IEEE GRSS Chapter-News". Retrieved 2014-09-07.
  32. ^ "Workshop on "Mathematical Morphology and Pattern Recognition: Theory and Applications" 26-28 March, 2013 Bangalore, India". Retrieved 2014-09-07.
  33. ^ "5-Day course on "Spatial Statistical Tools in Data Processing and Analysis", 26-30 Nov 2012, Bangalore, India". Retrieved 2014-09-07.
  34. ^ "Workshop on 'Advanced Methods in Spatial Data Processing and Analysis', 6-7 March 2012, Bangalore, India". Retrieved 2014-09-07.
  35. ^ "Workshop 'Honoring Jean Serra' 25-26 October 2010, Bangalore, India". Retrieved 2014-09-07.
  36. ^ "4-Day course on "Mathematical Morphology in Image Analysis, Geomorphology, and GISci', 19-23 Oct 2010, Bangalore, India". Retrieved 2014-09-07.
  37. ^ "International Seminar of Spatial Information Retrieval Analysis, Reasoning and Modelling (SIRARM), 18-20 March 2009, Bangalore, India". Retrieved 2014-09-07.

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