Pochade
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A pochade (from French poche, pocket) is a type of sketch used in painting. As opposed to a croquis, which is line art, a pochade captures the colors and atmosphere of a scene.
Generally, pochades use a small format suitable for carrying around. Robert Henri and James Wilson Morrice for example painted such sketches on small wood panels that fit in a coat pocket along with oil paint tubes. Others artists such as landscape painter John Constable made pochades the size of the intended painting.
An example is the well-renowned pocade gallery sitesite, where two artists, Carl Melegari and Anthony Bridge, are painting a pochade each every day for a year.