Geographic Information System and Tools of Spatial Analysis in a Pneumococcal Vaccine Trial

BMC Research Notes, Vol. 5, January 2012

Antti Tanskanen, Leilani T Nillos, Antti Lehtinen, Hanna Nohynek, Diozele Hazel M Sanvictores, Eric A F Simoes, Veronica L Tallo, Marilla G Lucero, and Arivac Consortium

“Background:  The goal of this Geographic Information System (GIS) study was to obtain accurate information on the locations of study subjects, road network and services for research purposes so that the clinical outcomes of interest (e.g., vaccine efficacy, burden of disease, nasopharyngeal colonization and its reduction) could be linked and analyzed at a distance from health centers, hospitals, doctors and other important services. The information on locations can be used to investigate more accurate crowdedness, herd immunity and/or transmission patterns.

Distribution of the landmarks and road network in the study area Background map:

Distribution of the landmarks and road network in the study area Background map:

“Method:  A randomized, placebo-controlled, double-blind trial of an 11-valent pneumococcal conjugate vaccine (11PCV) was conducted in Bohol Province in central Philippines, from July 2000 to December 2004. We collected the information on the geographic location of the households (N = 13,208) of study subjects. We also collected a total of 1982 locations of health and other services in the six municipalities and a comprehensive GIS data over the road network in the area.

“Results:  We calculated the numbers of other study subjects (vaccine and placebo recipients, respectively) within the neighborhood of each study subject. We calculated distances to different services and identified the subjects sharing the same services (calculated by distance). This article shows how to collect a complete GIS data set for human to human transmitted vaccine study in developing country settings in an efficient and economical way.

“Conclusions: The collection of geographic locations in intervention trials should become a routine task.  The results of public health research may highly depend on spatial relationships among the study subjects and between the study subjects and the environment, both natural and infrastructural.”

UAV-based Sensor Web Monitoring System

International Journal of Navigation and ObservationInternational Journal of Navigation and Observation, In Press, 2012

Masahiko Nagai, Apichon Witayangkurn, Kiyoshi Honda, and Ryosuke Shibasaki

“UAV (Unmanned Aerial Vehicle)-based monitoring system is developed as an intermediate system between aerial survey and ground survey. All the measurement tools are mounted on the UAV to acquire detailed information from low altitudes which is different from a satellite or a plane. The monitoring is carried out from the sky, but the spatial and temporal resolutions are freely selected near the ground. In this study, the data is easily acquired with safety and mobility by the utilization of a Sensor Web. A Sensor Web is a type of sensor network which is well suited for environmental monitoring. Sensor nodes are spatially distributed and wirelessly communicate with each other. In this study, the UAV-based system is considered as a mobile sensor node. This study proposes a combination of UAV-based monitoring with a ubiquitous sensor network.”

System Architecture

System Architecture