Learn More
BACKGROUND Water plays an important role in the transmission of many infectious diseases, which pose a great burden on global public health. However, the global distribution of these water-associated infectious diseases and underlying factors remain largely unexplored. METHODS AND FINDINGS Based on the Global Infectious Disease and Epidemiology Network(More)
J. L. Chen, C. R.Wilson, B. F. Chao, C. K. Shum and B. D. Tapley 1 Center for Space Research, University of Texas at Austin, 3925 West Braker Lane, Suite 200, Austin, TX 78759-5321, USA. E-mail: chen@csr.utexas.edu 2 Department of Geological Sciences, University of Texas at Austin, Austin, TX 78712, USA. E-mail: clarkw@maestro.geo.utexas.edu 3 NASA(More)
BACKGROUND Harmful cyanobacterial blooms present a global threat to human health. There is evidence suggesting that cyanobacterial toxins can cause liver damage and cancer. However, because there is little epidemiologic research on the effects of these toxins in humans, the excess risk of liver disease remains uncertain. The purpose of this study is to(More)
We report the detection of an earthquake by a space-based measurement. The Gravity Recovery and Climate Experiment (GRACE) satellites observed a +/-15-microgalileo gravity change induced by the great December 2004 Sumatra-Andaman earthquake. Coseismic deformation produces sudden changes in the gravity field by vertical displacement of Earth's layered(More)
We study minimal energy interpolation and discrete and penalized least squares approximation problems on the unit sphere using nonhomogeneous spherical splines. Several numerical experiments are conducted to compare approximating properties of homogeneous and nonhomogeneous splines. Our numerical experiments show that nonhomogeneous splines have certain(More)
a Division of Geodetic Science, School of Earth Sciences, The Ohio State University, Columbus OH, USA b U.S. Geological Survey, Vancouver WA, USA c U.S. Geological Survey, Louisiana Water Science Center, Baton Rouge LA, USA d U.S. Geological Survey, National Wetlands Research Center, Lafayette LA, USA e Department of Civil Engineering and Environmental(More)
Characterization of surface water storage changes in Arctic lakes using simulated SWOT measurements Hyongki Leeab; Michael Durandb; Hahn Chul Jungab; Doug Alsdorfab; C. K. Shumab; Yongwei Shengc a Division of Geodetic Science, School of Earth Sciences, The Ohio State University, Columbus, OH, USA b Byrd Polar Research Center, The Ohio State University,(More)
[1] We determine a regional spatiotemporal gravity field over northern South America including the Amazon region using GRACE inter-satellite range-rate measurements by application of a wavelet-based multiresolution technique. A major advantage of this method is that we are able to represent the Amazon hydrological signals in form of time series of detail(More)
Previous studies using satellite radar altimetry to observe inland river and wetland water level changes usually spatially average high-rate (10-Hz for TOPEX, 18-Hz for Envisat) measurements. Here we develop a technique to apply retracking of TOPEX waveforms by optimizing the estimated retracked gate positions using the Offset Center of Gravity retracker.(More)
This paper summarizes the results and outcomes of our NSF Digital Government project. During four years, this project concentrated on investigating, integrating and developing geospatial technologies to enhance the operational capabilities of federal, state, and local agencies responsible for coastal management and decision making. Successful collaborations(More)