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geohelp.txt
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1989-05-18
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The OUTPUT SELECTION── program lets you choose a portion of the
DATA ON the CDROM for extraction to your hard disk. If you have
previously viewed the selected data in the View Data- portion of
the software, the selection parameters will be passed to the
"Output Selection" programs by selecting the Pass View
Parameters─ option instead of the KeyBoard Entry option.
By entering a DIRECTORY NAME, the user specifies where on the
hard disk the data will be transferred. Standard DOS nomencla-
ture is used to specify the path. In the absence of a directory
name, the software will output data to the current directory.
Topography (5-min) data are available as either an ascii or bi-
nary file. These data represent average values of elevation and
bathymetry, with complete coverage for North America.
Topography Land (30-sec) is an ascii file of average elevations
covering primarily conterminous United States.
NOS Hydrography (30-sec) is an ascii file of average bathymetric
data, collected by the National Ocean Service, the coverage in-
cludes coastal and inland waters in the United States. The for-
mat is similar to the land 30-sec data, but quality codes are ap-
pended to each record.
Topography Land/Marine (30-sec) is a binary file that contains a
merged representation of the two 30-sec data sets previously
described.
DNAG Gravity is available as a 6-km grid (in ascii) or a 2.5-min
grid (in binary). The data include Bouguer anomalies on land and
free air anomalies in marine areas. Coverage is for all of North
America (excluding Mexico).
SEG Gravity is available as a 4-km grid for the United States.
The data are in ascii and include Bouguer (land) and free-
air(marine) anomalies.
Isostatic Gravity for the United States is in either a 4-km grid
(in ascii) or a 2.5⌐min grid (in binary). In addition to the 4-km
residual grid, companion 8-km regional isostatic gravity
anomalies and average elevations are extracted.
DNAG Magnetics is available as either a 2-km grid (in ascii) or
a 2.5-min grid (in binary). Coverage is for all of North
America (excluding Mexico).
MAGSAT magnetic anomalies were originally developed on a 2-degree
grid (in ascii) and extend from the equator to 50-degrees
latitude.
These data have been smoothed and are also available on a 2.5-min
grid (in binary).
Advanced Very High Resolution Radiometer (AVHRR) data from NOAA
Polar Orbiting Environmental Satellites were selected for a week
in June and November 1986. Individual channels may be selected
or the user may choose to extract a computed vegetation index.
Seismicity data may be extracted by specifying a range of dates
(1534 to 1985) and/or a range of magnitude (2.5 to 8.7). By
selecting both ranges, only data meeting both criteria will be
retrieved.
Crustal Stress can be selected by choosing a range of azimuth
(0 to 180) and/or a range of qualities A (best) to D
(worst), with E (unknown). Also, a stress type can be specified,
or all types can be selected. If more than one range or criteria
is specified, only data meeting all criteria will be retrieved.
Thermal Aspect data can be retrieved on ranges of heat flow or
thermal gradients or both. (Note: If ranges are specified for
both, ONLY data meeting both criteria will be found.)
Additionally, minimum and maximum quality constraints can be
given from 1 (+/- 5%) to 6 (no quality).
DESELECT A DISCIPLINE gives the user the option to change the
retrieval selections. You must use this command for each dis-
cipline you choose to delete from your output search.