Abstract: Cloud cover information over a selected portion of the earth, such as that obtained from a satellite (10) is converted into digital form and stored in a picture memory RAM (40). The memory can be interrogated and displayed on a television monitor (100) or transmitted by a television station (110). Geographical information, such as the location of water bodies and land masses, stored in a map memory ROM (50), and this memory is interrogated at the same time as the picture memory to generate a color subcarrier which is added to the video from the picture memory. The hue of the combined picture is varied according to the intensity of the video signal from the picture memory by means of a combinational logic circuit (60).

Abstract: A radial sweep generator circuit generates a series of radial sweep lines in succession to simulate a rotating sweep line which extends from the center of a video display to the periphery of the display. The display consists of a rectangular matrix of display positions arranged in lines and columns which are scanned in a raster scanning format. A vector number generator generates a vector number signal corresponding to one of the radial sweep lines which is to be displayed. A vector origin counter determines the display position on the periphery of the matrix from which the sweep line is to originate. A vector line generator is responsive to the vector number generator and to the vector origin counter for providing video display pulses.

Abstract: Facsimile weather radar information (800 lines/frame) is stored, every third line, in a solid state RAM 35, capacity 256 three bit words per line, 256 lines. Subdivision of digital information from A/D converter 30 into digital words is accomplished using division by seven of television horizontal sync. The RAM is read at TV line rate (15.75 KHz) and lines of digital information clocked out of RAM at 1.59 MHz under control of a 14.3 MHz master oscillator which can be locked to external TV sync. Digital RAM output is processed into an analog signal, then through colorizer and blanking circuits (42 and 45) which insert synchronizing and color burst information, producing a broadcast compatible composite television output, presentable on color TV receivers with blue background and clouds, precipitation, etc., varying intensities of yellow.