Under Revision and Maintenance
The aim of this page is to provide a brief and somewhat informal description of our current research in environmental informatics. All research topics below are linked to pages with more details and references.
Remote sensing of geophysical variables almost always involves indirect measurements of energies in relevant bands of the electro-magnetic spectrum, taken by an instrument on board a satellite or some other flight vehicle. For any one measurement at a given location and time, inference on states of the atmosphere is carried out in the presence of uncertainty. Learn more...
The European Union has stringent methane emission targets in place that are challenging for several of its member countries to comply with, especially the United Kingdom. In order to know whether or not targets are being met, methane flux estimates first need to be obtained. However, assessing a country's emission portfolio is no simple task. Click here for details on our research on atmospheric gas inversion that focuses on regional flux estimation from ground data.
Multivariate geostatistics is based on modelling all covariances between all possible combinations of two or more variables at any locations in a continuously indexed domain. Multivariate spatial covariance models need to be built with care, since any covariance matrix that is derived from such a model has to be nonnegative-definite. In our research, we are exploring techniques for model construction that require only univariate covariance functions yet yield valid multivariate models. The approach, based on conditioning, has a vast array of applications since it features conditional dependencies on a potential causative process. The project on regional methane flux mapping given above is one such application. Click here for details on our research efforts in this area.
A compelling reason for environmental monitoring, and the purpose of many environmental studies, is to predict the location and the extent of extreme events, such as floods and drought, and to quantify the probability of such an event. Whilst statistical models are routinely used for spatial prediction, exceedance probabilities for spatial extremes are not as straightforward: Dependent spatial predictions at many locations must be assessed simultaneously, and it is often the extremes of spatially aggregated regions that is of interest. Important applications of this work include predicting the locations of carbon dioxide sources and sinks, and predicting the regions that may be affected by global climate change. Click here for details on our research efforts in this area.
In the digital age, when data and algorithms are implemented in a computer, reproducibility has never been easier. However, many researchers still consider reproducibility as an `afterthought'. At CEI we spend a considerable amount of time exploring ways in which to make our results reproducible through versioning and packaging. In this page we outline the protocols that we have found most useful in ensuring permanence of the results. After ensuring reproducibility, we then explore ways the results can be disseminated, visually, to scientists and members of the general public.