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I*2 INTEGER	A format of data whose values are represented by 16-bit words. Data distributed as I*2 format can have values ranging between -32,768 to +32,767. This format is commonly used for digital elevation and other data which requires values higher than the 0 to 255 range available for 8-bit (byte) data used for many remote sensing satellite image data.
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IEEE	Institute of Electrical and Electronic Engineers
IFOV	Instantaneous Field-of-View IFOV is the solid angle through which a detector is sensitive to radiation. In a scanning system this refers to the solid angle subtended by the detector when the scanning motion is stopped. The IFOV is commonly expressed in milliradians.
IGES	Initial Graphic Exchange Specification
IHO	the International Hydrographic Organization
IMDISP	IMDISP is an interactive IMage DISPlay utility for personal computers. It can be used to display and manipulate raster images on the images on the PC's monitor screen, as well as to perform some basic digital image processing tasks such as histograms and contrast enhancement. When accessing raster images using IMDISP, the program requires the user to supply information about the size, type and location the image file to be displayed. This information can be entered manually, or provided in an ASCII label file. This label file can be located at the beginning of an IMDISP formatted image file, or as a separate file that points to the image file. IMDISP is public domain software developed by Mike Martin at NASA's Jet Propulsion Laboratory in Pasadena, California, and supported by the NASA Goddard Space Flight Center in Greenbelt, Maryland.
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INTERCEPT	Intercept is the distance from the origin to the point at which a curve or line crosses an axis.
INTERPOLATE	To insert a value between known values by using a procedure or algorithm specifically related to the known values.
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ISO	International Organization for Standardization The ISO is a specialized international agency established to maintain standardization. Over 85 countries are participating members. Only one organization from each participating country may be a member. As an example ANSI is the United States member body. Members contribute to technical committees and vote for or against the approval of developed standards.
ISO 10303	product data representation and exchange, STEP
ISO 8211	specification for a data descriptive file for information interchange
ISO 9660	The ISO 9660 standard is the currently accepted industry standard for Compact Disc-Read Only Memory (CD-ROM). This standard assures the generation of CD-ROMs whose format is compatible with a multitude of computer platforms supporting IBM compatible DOS, Apple Macintosh, and Unix operating systems.
ISOMETRIC PROJECTION	A method of drawing figures and maps so that three dimensions are shown not in perspective but in their actual measurements.
ISOPLETH	A line on a map connecting points at which a given variable has a specified constant value.
ISOTOPE-DILUTION MASS SPECTROMETRY	This destructive analytical technique is used to determine concentrations of specific chemical elements based on their rates of molecular diffusion in a gaseous or vaporous mixture. A known quantity of the chemical element in question is added to the mixture. This quantity, referred to as a tracer, is monitored to measure its diffusion rate.
ISOTOPIC AGE	Isotopic age, also referred to as radiometric age, is an age of rocks expressed in years and calculated from the quantitative determination of radioactive elements and their decay products.
ITS	Intelligence Transportation System