Abstract: A photogrammetric method is described for obtaining estimates of the horizontal diffusion parameter σy from oblique aerial photographs of smoke clouds. The method requires three reference markers on the ground to determine ...

Abstract: new ground-based wind profiling technology?a scanned bistatic sodar?is described. The motivation for this design is to obtain a ?mastlike? wind vector profile in a single atmospheric column extending from the ground to ...

Abstract: major risk to helicopters is the unexpected encounter of degraded visual environments in close-to-ground operations, where a loss of visibility often is caused by clouds of dust (brownout) or snow (whiteout) stirred up by ...