N. D. Weston

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developed a web-based service called OPUS (On-line Positioning User Service) to provide GPS users easier access to the country's National Spatial Reference System (NSRS). OPUS allows professionals in the fields of geodesy, surveying, mapping, and GIS to submit their GPS data files to NGS headquarters, via the web, where they are processed to determine(More)
The National Geodetic Survey (NGS) officially began public operation of the web-based On-line Positioning User Service (OPUS) in March 2001 as a means to provide GPS users easier access to the National Spatial Reference System (NSRS). Through OPUS, our goal is to provide the means to accurately, reliably, and quickly obtain consistent geodetic positions.(More)
We read with interest the article by McBride et al, which reported that only 4% of 127 patients and relatives in an outpatient clinic post hip replacement following a hip fracture correctly acknowledged one-year mortality for hip fractures to be approximately 30%. Poor knowledge retention of doc-tor–patient consultations (20–60%) 1 does not explain this(More)
A single exposure to menthol can, depending on concentration, enhance both cool sensations and encourage body heat storage. This study tested whether there is an habituation in either response after repeated-daily exposures. Twenty-two participants were assigned to one of three spray groups: Control (CON; n=6), 0.05% L-menthol (M(0.05%); n=8), and 0.2%(More)
SUMMARY This research is aimed at determining how and to what extent rover station coordinate accuracies, from the Online Positioning User Service (OPUS), at the National Geodetic Survey (NGS), are influenced by reference station spacing and rover station occupation times. The first phase of the experiment was to treat a large number of stations in the CORS(More)
Recently, a new set of 14 transformation parameters was jointly adopted by National Resources Canada (NRCan) and the U. Although a unique set of similarity transformation equations could be applied everywhere to transform positional coordinates between these two terrestrial frames, a more consistent set of NAD 83 coordinates can be obtained if, locally,(More)
OPUS Projects – A Web-based application to administer and process multi-day GPS campaign data. SUMMARY The National Geodetic Survey (NGS) has operated the Online Positioning User Service (OPUS) since March 2001, to provide end-users easy access to the National Spatial Reference System (NSRS) using GPS data. Due to the program's popularity and the continuing(More)
2 Highlights  A single skin surface exposure to menthol enhances cool sensations and heat storage  Heat storage by menthol is mediated by a vasoconstrictor response  Repeated menthol exposure causes an habituation of cool sensation but not heat storage  0.2 % menthol activation of thermoreceptors equals a 0.5°C fall in skin temperature Abstract (250(More)
SUMMARY During the last year, a number of significant milestones related to terrestrial reference frames were achieved. One of the most notable changes took place on April 17, 2011, when the International GNSS Service (IGS) adopted the IGS08 reference frame, a frame defined by a subset of 232 geocentric stations from the International Terrestrial Reference(More)