Objectives: To provide evidence of underdiagnosis of coeliac disease and to describe the
main presenting symptoms of coeliac disease in primary care. Design: Case finding in a …

All digital data contain error and many are uncertain. Digital models of elevation surfaces
consist of files containing large numbers of measurements representing the height of the …

State of the art reviews of remote sensing change detection are becoming increasingly
complicated and disparate due to an ever growing list of techniques, algorithms and methods. To …

… binary viewshed because of error in the elevation database (Fisher 1991a) and uncertainty
in determination of visibility because of variation between different algorithms (Fisher 1993). …

Commercial vendors of human tracking systems tout benefits and diminish, dismiss, or deny
any potential for abuse. Indeed, the benefits of location based services (LBS) are myriad, …

In most documentation of geographical information systems (GIS) it is very rare to find details
of the algorithms used in the software, but alternative formulations of the same process may …

Digital elevation models (DEMS) are computer representations of a portion of the land
surface. The elevations recorded in the DEM are not, however, without error, and the United …

Calculation of the viewshed from a digital elevation model (OEM) is a common capability of
a GIS packages. Two mistaken assumptions are made, however: first, that the OEM is …

Technological advances in position aware devices increase the availability of tracking data
of everyday objects such as animals, vehicles, people or football players. We propose a …

There follows a summary of the proposed variants, and a re-~ h~ determination of the visible
area or viewshed from a view of their sensitivity to database error. Finally, a discusviewing …