Polarimetric images of the earth have been obtained for the first time by means of the Space Shuttle. These depict the environs of Hawaii in three visible bands of polarized light. A transect drawn on each image, crossing only cloud-free ocean areas, has both positive and negative polarization values along its path. These results are compared with those of several models, and with aircraft measurements of a haze-free, hydrosol-free ocean area, regarded as `air truth.' Based on the models and the air truth, the negative percent polarization values are attributed to haze, even though haze is not visible in a photograph taken from space. This haze obscures the effects of wind-generated surface roughness, and suspended hydrosols, so that they cannot be separately distinguished. The Hansen-Travis radiative transfer model predicts that the haze must have a large optical depth. The air truth shows that in the absence of haze, the wind velocity can be characterized by polarimetric measurements. The effect of hydrosols on polarization is not yet clear.