B. S. Daya Sagar

Behara Seshadri Daya Sagar FRGS, also known as B. S. Daya Sagar (born in 1967 in India) is an Indian mathematical geoscientist specializing in mathematical morphology. He is a professor of computer science at the Indian Statistical Institute, Bangalore.[1] He is known as a specialist in mathematical morphology, fractal geometry. chaos theory, and their applications in geophysics, geographical information science, and computational geography. The Indian Geophysical Union awarded him the Krishnan Medal in 2002. He is the first Asian to receive the Georges Matheron Lectureship in 2011. In 2018, he received the IAMG Certificate of Appreciation by the International Association for Mathematical Geosciences for his work on the Handbook of Mathematical Geosciences.[2][3]He is an IEEE Geoscience and Remote Sensing Society Distinguished Lecturer (DL).[4][5]

B. S. Daya Sagar
Sagar in 2014.
Born1967
India
Citizenship India
Alma materAndhra University College of Engineering
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. Prakasa Rao and SVLN Rao
Websitehttp://www.isibang.ac.in/~bsdsagar

Education

Sagar was educated at St. Anthony's School,[6] Visakhapatnam, Government High School-Samalkota, and 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 MSc 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

After receiving his doctorate, Sagar worked in Andhra University College of Engineering as a research associate (1994–95 and 1998-98) of CSIR, and as a research scientist/principal investigator (1997-7) in the Scheme for Extramural Research for Young Scientists funded by Ministry of Science and Technology. From 1998–2001, he worked as a research scientist at the Centre for Remote Imaging Sensing and Processing (CRISP) of the National University of Singapore. He was appointed Associate Professor of Faculty of Engineering and Technology, Multimedia University (MMU), Malaysia in 2001 and was also a Deputy Chairman of the Centre for Applied Electromagnetics (2003–07) there. During 2007–13, he was an Associate Professor at the Indian Statistical Institute-Bangalore centre, and since 2009, he has been acting as founding head of SSIU, a unit established in 2009 as a constituent unit of its Computer and Communication Sciences Division. Since 2013, he has been a professor at the Indian Statistical Institute.

Research

Sagar's research contributions span both basic and applied fields, and involves the fusion of computer simulations and modeling techniques in order to develop cogent models in discrete space to gain an understanding of dynamical behavior of complex terrestrial systems, such as water bodies, river networks, mountain objects, folds, dunes, landscapes, and rock porous media. He developed specific technologies and spatial algorithms for using data acquired at multiple spatial and temporal scales for developing cogent domain-specific models. His work employs concepts stemmed out of recent theories—such as mathematical morphology, fractals, chaos, and morphometrics—to develop spatial algorithms for (i) pattern retrieval, (ii) pattern analysis, (iii) simulation and modeling, and (iv) reasoning and visualization of the spatial and temporal phenomena of terrestrial and GISci relevance. His studies 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.[7]

Professional

Sagar has been honored with the 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 80+ papers in peer reviewed international journals, 3 books, and 7 edited Special-Theme issues for well known journals.[8] He has been on Editorial Boards of Computers & Geosciences, Mathematical Geosciences, and Discrete Dynamics in Nature & Society.

Sagar receiving the Georges Matheron Lectureship Award-2011 of International Association for Mathematical Geosciences from Qiuming Cheng in Salzburg, Austria on 7 September 2011

Professional activities
  • Editor of Discrete Dynamics in Nature and Society: Multidisciplinary Research and Review Journal[9]
  • Editorial Board Member, Computers & Geosciences[10]
  • Editorial Board Member, Mathematical Geosciences[11]
  • Review Editor of Environmental Informatics-Frontiers (Frontiers Media)[12]
  • Associate Editor of Image Analysis & Stereology[13]
  • Founding Chairman, Bangalore Section IEEE GRSS Chapter[14][15]

Honors and awards

Books
  • B. S. Daya Sagar, Qiuming Cheng, and Frits Agterberg, Handbook of Mathematical Geosciences: Fifty Years of IAMG, Springer Publishers: Cham, p. 942, 2018.[24]
  • B. S. Daya Sagar, Mathematical Morphology in Geomorphology and GISci, CRC Press: Boca Raton, p. 546, 2013.[25][26][27][28][29][30][31]
  • B. S. Daya Sagar, Qualitative Models of Certain Discrete Natural Features of Drainage Environment, Allied Publishers: New Delhi, p. 231, 2005.[32]

Edited Journal Special Issues
  • B. S. Daya Sagar (with Avik Bhattacharya, Lorenzo Bruzzone and Paul A. Rosen) (Eds.), Special Issue on "Applied Earth Observation and Remote Sensing in India", IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, v. 10, no. 12, 2017.[33]
  • B. S. Daya Sagar (with Laurent Najman, Junior Barrera, Petros Maragos, and Dan Schonfeld) (Eds.), Special Issue on 'Filtering and Segmentation with Mathematical Morphology' IEEE Journal of Selected Topics in Signal Processing, v. 6, no. 7, p. 737-886, 2012.[34]
  • B. S. Daya Sagar (with Jean Serra) (Eds.), Special Issue on 'Spatial Information Retrieval, Analysis, Reasoning and Modelling', International Journal of Remote Sensing, v. 31, no. 22, p. 5747-6032, 2010.[35]
  • B. S. Daya Sagar (with Lori Mann Bruce) (Eds.), Special Section on 'Surficial Mapping', IEEE Geoscience and Remote Sensing Letters (ISSN 1545-598X). v. 2, no. 4, p. 375-408, 2005.[36]
  • B. S. Daya Sagar (with Govindan Rangarajan and Daniele Veneziano) (Eds.) Special Issue on 'Fractals in Geophysics' Chaos Solitons & Fractals (Elsevier Publishers), v. 19, no. 2, p. 237-462, 2004.[37]
  • B. S. Daya Sagar (with C. Babu Rao) (Eds.), Special Issue on 'Quantitative Image Morphology' International Journal Pattern Recognition and Artificial Intelligence (World scientific Publishers), v. 17, no. 2, p. 163-330, 2003.[38]
  • B. S. Daya Sagar (Ed.): Special Issue 'In memory of the Late Professor SVLN Rao' Journal of Mathematical Geosciences (then Kluwer Academic Publishers), v. 33, no. 3, p. 245-396, 2001.[39]

Selected Recent Journal Publications
  • B. S. Daya Sagar, 2019, Variable-Specific classification of zones, pairs of zones, and clusters of a spatial system via modified gravity model, IEEE Transactions on Emerging Topics in Computing. v. 7, no. 2, p. 230-241.[40]
  • Aditya Challa, Sravan Danda, B. S. Daya Sagar, and Laurent Najman, 2018, Some Properties of Interpolations Using Mathematical Morphology, IEEE Transactions on Image Processing, v. 27, no. 4, p. 2038-2048.[41]
  • B. S. Daya Sagar and Lim Sin Liang, 2015, Morphing of Grayscale DEMs via Morphological Interpolations, IEEE Journal on Selected Topics on Applied Earth Observation and Remote Sensing, v. 8, no. 11, p. 5190-5198.[42]
  • B. S. Daya Sagar and Lim Sin Liang, 2015, Ranks for pairs of spatial fields via metric based on grayscale morphological distances, IEEE Transactions on Image Processing, v. 24, no. 3, p. 908-918.[43]
  • B. S. Daya Sagar, 2014, Cartograms via mathematical morphology, Information Visualization, v. 13, no. 1, p. 42-58.[44]
  • B. S. Daya Sagar, 2010, Visualization of spatiotemporal behavior of discrete maps via generation of recursive median elements, IEEE Transactions on Pattern Analysis and Machine Intelligence, v. 32, no. 2, p. 378-384.[45]
  • Lim Sin Liang, and B. S. Daya Sagar, 2008, Cloud field segmentation via multiscale convexity analysis, Journal of Geophysical Research-Atmospheres, v. 113, D13208.[46]
  • Alan W. C. Tan, M. V. C. Rao, and B. S. Daya Sagar, 2007, Robust signal subspace speech classifier, IEEE Signal Processing Letters, v. 14, no. 11, p. 844-847.[47]
  • B. S. Daya Sagar, 2007, Universal scaling laws in surface water bodies and their zones of influence, Water Resources Research, v. 43, no. 2, W02416.[48]
  • Alan W. C. Tan, M. V. C. Rao, and B. S. Daya Sagar, 2007, A discriminative signal subspace speech classifier, IEEE Signal Processing Letters, v. 14, no. 2, p. 133-136.[49]
  • Lea Tien Tay, B. S. Daya Sagar, and Chuah Hein Teik, 2006, Allometric relationships between travel-time channel networks, convex hulls, and convexity measures, Water Resources Research, v. 42, no. 6,W06502.[50]
  • Lea Tien Tay, B. S. Daya Sagar, and Chuah Hein Teik, 2005, Analysis of geophysical networks derived from multiscale digital elevation models: a morphological approach, I.E.E.E Geoscience and Remote Sensing Letters. v. 2, no. 4, p. 399-403.[51]
  • L. Chockalingam and B. S. Daya Sagar, 2005, Morphometry of network and non-network space of basins, Journal of Geophysical Research-Solid Earth, v. 110, B08203.[52]
  • B. S. Daya Sagar, 2005, Discrete simulations of spatio-temporal dynamics of small water bodies under varied streamflow discharges, Nonlinear Processes in Geophysics, v. 12, p. 31-40.[53]
  • B. S. Daya Sagar and L. Chockalingam, 2004, Fractal dimension of non-network space of a catchment basin, Geophysical Research Letters, v. 31, no.12, L12502.[54]
  • B. S. Daya Sagar and Tay Lea Tien, (2004) Allometric power-law relationships in a Hortinian fractal digital elevation model, Geophysical Research Letters, v. 31, no. 6, L06501.[55]

See also

References
  1. "B. S. Daya Sagar". Indian Statistical Institute, Bangalore. Retrieved 1 November 2014.
  2. IAMG Certificate of Appreciation at IAMG 2018 (https://www.iamg.org/images/File/documents/Newsletters/Newsletters_KS/NL97-low.pdf).
  3. "IAMG Newsletter No 97 December, Page 4;" (PDF). 15 December 2018. Retrieved 12 January 2019.
  6. http://stanthonyvizag.com/school/school-history
  7. "What do Mathematical Geoscientists Do?: Letter to the Editor by John Harbaugh of Stanford University, IAMG Newsletter, NL89, p. 5" (PDF). Retrieved 10 July 2015.
  8. "Sagar: ResearcherID of Thomson Reuters". Retrieved 19 September 2014.
  9. "Discrete Dynamics in Nature and Society-Editorial Board". Retrieved 7 September 2014.
  10. Computers & Geosciences-Editorial Board. Retrieved 7 September 2014.
  11. Mathematical Geosciences-Editorial Board. Retrieved 12 January 2019.
  12. "Environmental Informatics-Frontiers-Editorial Board". Retrieved 15 January 2015.
  13. "Image Analysis & Stereology-Editorial Board". Retrieved 15 January 2015.
  14. "Bangalore Section IEEE GRSS Chapter-Homepage". Retrieved 7 September 2014.
  15. Sagar, B.S. Daya; Meher, Saroj Kumar (2013). "Bangalore Section IEEE GRSS Chapter-News". IEEE Geoscience and Remote Sensing Magazine. 1 (2): 72–73. doi:10.1109/MGRS.2013.2260918.
  18. "IAMG Newsletter No 97 December, Page 4;" (PDF). 15 December 2018. Retrieved 12 January 2019.
  19. "Georges Matheron Award Photos" (PDF). Retrieved 30 August 2014.
  20. "IAMG Newsletter No 82 May, Page 4;" (PDF). 1 May 2011. Retrieved 25 August 2014.
  21. "CURZONCO-SESHACHALAM LECTURES-5(2009)-Announcement". Retrieved 8 September 2014.
  22. "CURZONCO-SESHACHALAM LECTURES-5(2009)". Retrieved 8 September 2014.
  23. "IGU fellows" (PDF). Indian Geophysical Union. 2016.
  24. B.S. Daya Sagar, Qiuming Cheng, and Frits Agterberg (2018). Daya Sagar, B.S; Cheng, Qiuming; Agterberg, Frits (eds.). Handbook of Mathematical Geosciences: Fifty Years of IAMG, 2018, p.942. Springer Publishers, Cham. doi:10.1007/978-3-319-78999-6. ISBN 978-3-319-78998-9.CS1 maint: uses authors parameter (link)
  25. B.S. Daya Sagar (29 May 2013). Mathematical Morphology in Geomorphology and GISci, 2013, p.546. CRC Press, Boca Raton. ISBN 9781439872000. Retrieved 6 September 2014.
  26. B.S. Daya Sagar. "Mathematical Morphology in Geomorphology and GISci, 2013, p.546". CRC Press, Boca Raton.
  27. "Editorial Reviews on Mathematical Morphology in Geomorphology and GISci". Retrieved 7 September 2014.
  28. "Book Review on Mathematical Morphology in Geomorphology and GISci, ACM Computing Reviews, Reviewer: Jose Manuel Palomares Munoz". Retrieved 18 September 2014.
  29. McGrath, Gerald (2013). "Book Review on "Mathematical Morphology in Geomorphology and GISci"". Geomatica. 67 (4): 280–284. doi:10.5623/cig2013-056.
  30. Beucher, Serge (2015). "B.S. Daya Sagar: Mathematical Morphology in Geomorphology and GISci". Mathematical Geosciences. 47 (2): 247–248. doi:10.1007/s11004-014-9569-3.
  31. "Short Reviews by Renowned Experts on Mathematical Morphology in Geomorphology and GISci" (PDF). Retrieved 5 November 2014.
  32. B.S. Daya Sagar (2005). Qualitative Models of Certain Discrete Natural Features of Drainage Environment, 2005, Pages 231. Allied Publishers, New Delhi. ISBN 9788177644463.
  33. Bhattacharya, Avik; Bruzzone, Lorenzo; Sagar, B. S. Daya; Rosen, Paul A. (2017). "Foreword to the Special Issue on Applied Earth Observation and Remote Sensing in India". IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing. 10 (12): 5151–5154. Bibcode:2017IJSTA..10.5151B. doi:10.1109/JSTARS.2017.2773847. hdl:11572/193686.
  34. http://ieeexplore.ieee.org/xpl/tocresult.jsp?isnumber=6329953&punumber=4200690
  35. http://www.tandfonline.com/toc/tres20/31/22?nav=tocList
  36. http://ieeexplore.ieee.org/xpl/tocresult.jsp?isnumber=32554&punumber=8859
  37. https://www.sciencedirect.com/science/journal/09600779/19/2
  38. "International Journal of Pattern Recognition and Artificial Intelligence | Vol 17, No 02".
  39. https://link.springer.com/journal/11004/33/3/page/1
  40. Daya Sagar, B. S. (2019). "Variable-Specific Classification of Zones, Pairs of Zones, and Clusters of a Spatial System via Modified Gravity Model". IEEE Transactions on Emerging Topics in Computing. 7 (2): 230–241. doi:10.1109/TETC.2016.2633436.
  41. Challa, Aditya; Danda, Sravan; Daya Sagar, B. S.; Najman, Laurent (2018). "Some Properties of Interpolations Using Mathematical Morphology" (PDF). IEEE Transactions on Image Processing. 27 (4): 2038–2048. Bibcode:2018ITIP...27.2038C. doi:10.1109/TIP.2018.2791566. PMID 29994169.
  42. Daya Sagar, B. S.; Sin Liang Lim (2015). "Morphing of Grayscale DEMs via Morphological Interpolations". IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing. 8 (11): 5190–5198. Bibcode:2015IJSTA...8.5190D. doi:10.1109/JSTARS.2015.2490098.
  43. Daya Sagar, B. S.; Sin Liang Lim (2015). "Ranks for Pairs of Spatial Fields via Metric Based on Grayscale Morphological Distances". IEEE Transactions on Image Processing. 24 (3): 908–918. Bibcode:2015ITIP...24..908S. doi:10.1109/TIP.2015.2390135. PMID 25585422.
  44. Sagar, B S Daya (2013). "Cartograms via mathematical morphology". Information Visualization. 13: 42–58. doi:10.1177/1473871613480061.
  45. Daya Sagar, B.S (2010). "Visualization of Spatiotemporal Behavior of Discrete Maps via Generation of Recursive Median Elements". IEEE Transactions on Pattern Analysis and Machine Intelligence. 32 (2): 378–384. doi:10.1109/TPAMI.2009.163. PMID 20075466.
  46. https://pdfs.semanticscholar.org/f2e7/eb590deee066bc26f96dda04abad89fa7c6b.pdf?_ga=2.78728660.1925104324.1512444698-2051427982.1512444698
  47. Tan, Alan W. C.; Rao, M. V. C.; Sagar, B. S. Daya (2007). "Robust Signal Subspace Speech Classifier". IEEE Signal Processing Letters. 14 (11): 844–847. Bibcode:2007ISPL...14..844T. doi:10.1109/LSP.2007.900036.
  48. Sagar, B. S. Daya (2007). "Universal scaling laws in surface water bodies and their zones of influence". Water Resources Research. 43 (2): W02416. Bibcode:2007WRR....43.2416S. doi:10.1029/2006WR005075.
  49. Tan, Alan W. C.; Rao, M. V. C.; Sagar, B. S. Daya (2007). "A Discriminative Signal Subspace Speech Classifier". IEEE Signal Processing Letters. 14 (2): 133–136. Bibcode:2007ISPL...14..133T. CiteSeerX 10.1.1.1027.8821. doi:10.1109/LSP.2006.882091.
  50. Tay, Lea Tien; Sagar, B. S. Daya; Chuah, Hean Teik (2006). "Allometric relationships between traveltime channel networks, convex hulls, and convexity measures". Water Resources Research. 42 (6): W06502. Bibcode:2006WRR....42.6502T. CiteSeerX 10.1.1.331.2779. doi:10.1029/2005WR004092.
  51. Tay, L.T.; Sagar, B.S.D.; Chuah, H.K. (2005). "Analysis of Geophysical Networks Derived from Multiscale Digital Elevation Models: A Morphological Approach". IEEE Geoscience and Remote Sensing Letters. 2 (4): 399–403. Bibcode:2005IGRSL...2..399T. doi:10.1109/LGRS.2005.856008.
  52. Chockalingam, L; Daya Sagar, B. S (2005). "Morphometry of network and nonnetwork space of basins". Journal of Geophysical Research. 110 (B8): B08203. Bibcode:2005JGRB..110.8203C. doi:10.1029/2005JB003641.
  53. https://www.nonlin-processes-geophys.net/12/31/2005/npg-12-31-2005.pdf
  54. Sagar, B. S. Daya; Chockalingam, L (2004). "Fractal dimension of non-network space of a catchment basin". Geophysical Research Letters. 31 (12): n/a. Bibcode:2004GeoRL..3112502S. CiteSeerX 10.1.1.329.6449. doi:10.1029/2004GL019749.
  55. Sagar, B. S. Daya; Tien, Tay Lea (2004). "Allometric power-law relationships in a Hortonian fractal digital elevation model". Geophysical Research Letters. 31 (6): n/a. Bibcode:2004GeoRL..31.6501S. doi:10.1029/2003GL019093.
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