Glossary for Geospatial Science

video frame:� A complete video image, which consists of two interlaced fields Odd lines of the frame are contained in the primary field which is alternated with the secondary field which contains the even lines.� The primary field lasts 1/60 of a second in standard broadcast video.� The secondary field follows in the next 1/60 of a second.� The entire frame takes 1/30 of a second to display.� There is a difference of 1/60 of a second between alternate lines in the image.