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Earth Imaging Glossary
A,
B,
C,
D,
E,
F,
G,
H,
I,
J,
K,
L,
M,
N,
O,
P,
Q,
R,
S,
T,
U,
V,
W,
X,
Y,
Z
" I "
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.
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.
IMDISP
The IMDISP is an interactive IMage DISPlay utility for personal computers. It can be used to
display and manipulate raster images on a PC's monitor screen, as well as being used to
perform 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 can be provided in an ASCII label file. This label file can be
located at the beginning of an IMDISP formatted image file or can be a separate file that
points to the image file.
The 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.
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.
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 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.
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Glossary Home
Initial content for this Glossary of terms has been graciously supplied by RADARSAT International - www.rsi.ca
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