Measuring photographs

Measuring Legume Content in Pastures Using Digital Photographs

Quantifying botanical composition is important for evaluating the effects of management on legume content and of legume content on pasture yield and quality. The standard for measuring botanical composition is hand separation of clipped samples. An alternative is taking point counts of botanical components on photographs of the pasture. The latter was tested on a rotationally stocked pasture, w...

Towards Measuring Fine-Grained Diversity Using Social Media Photographs

Diversity is an important socio-economic construct that influences multiple aspects of human lives from the prosperity of a city to corporate earnings and from criminal justice to health and social engagement. Large, heavily populated urban areas can be highly diverse at the city or even neighborhood level, but we know very little about how much people from diverse demographics (such as age and...

Photographs

StereoMeasure and StereoFeatures: Measuring Fish and Reconstructing Scenes Using Underwater Stereo Photographs

Photogrammetric techniques can and should be used for reconstruction of underwater scenes, in particular for estimation of fish sizes and species’ recognition. However, specifics of the medium render most of the algorithms developed for in-air conditions inapplicable without major alterations. The authors describe results of their experimentation with collected imagery and work in progress.

A new method of measuring aerosol optical properties from digital twilight photographs

An optimal-estimation algorithm for inferring aerosol optical properties from digital twilight photographs is proposed. The sensitivity of atmospheric components and surface characteristics to brightness and color of twilight sky is investigated, and the results suggest that tropospheric and stratospheric aerosol optical thickness (AOT) are sensitive to condition of the twilight sky. The coarse...