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<br />7 <br /> <br />displayed with a choice of sequence and rate, and with geostationary <br /> <br />~ <br />-~ <br /> <br />satellite data permits motion and development of weather and other <br /> <br />changing features to be easily observed. <br /> <br />, <br />~ <br /> <br />Interaction with the digital data being displayed is by means of <br /> <br />a joystick-cursor combination. Cursor size and position are set by <br /> <br />positioning of two joysticks or can be defined exactly by keying in <br /> <br />the parameters from the ADVISAR console. Cursor type, color and thick- <br /> <br />ness are all variable. The cursor defines a precise point or area on <br /> <br />the screen for many purposes. Digital values within the cursor may be <br /> <br />output, zoomed or moved from memory to memory, be used in calculations, <br /> <br />set to specific values, etc. Exact cursor location and size with <br /> <br />respect to the memory array are accessible and are useful for locating <br /> <br />~ <br /> <br />features on an image. <br /> <br />Computer access to the memories is used for identification and <br /> <br />.. <br /> <br />removal of noise and missing or bad lines of data. Many examples of <br /> <br />graphics capabilities are seen in the imagery examples within this <br /> <br />report. Graphics are most useful for identification of displayed <br /> <br />images and to point out interesting image features. <br /> <br />Shifting of images, up and down or left and right, aligns images <br /> <br />precisely so that movement of features from one image to another can <br /> <br />be determined or eliminated. Image overlaying displays two or more <br /> <br />frames at the same time so that digital values in one frame need not <br /> <br />be altered by the desire for grids, graphics, etc. to be displayed on <br /> <br />an image. Overlaying also isolates moving or stationary features on <br /> <br />multiple images as does digital image subtraction or addition, another <br /> <br />. <br /> <br />capability. More complete descriptions of ADVISAR uses and capabili- <br /> <br />ties are given by Brown (1978), Reynolds and Morris (1978a), Andrews <br /> <br />and Fitch (1979). <br />