GEODAS stores data on CD/DVD or DVD-ROM in compacted binary files to save space. You can download data from CD/DVD to an ASCII file(s) or Binary file(s). Data are downloaded for all surveys found by a Search, so before you can download data from the CD/DVD, you must first Run a Search.
1. Use the mouse to click on Task -> Download Data in the Menu bar of the main GEODAS window.
2. Save Data As (choose one):
a) Single File of All Surveys (default) - creates one
file named [Search KEY].??? (file extension depends on output format)
b) Multiple Survey Files, Complete Surveys - creates a separate file for each survey
named [NGDC Number].??? (file extension depends on output format)
under subdirectory named Search KEY. The complete survey will be downloaded.
c) Multiple Survey Files, data in Search Area - creates a separate file for each survey
named [NGDC Number].??? (file extension depends on output format)
under subdirectory named Search KEY. Only the data in the Search Area will be downloaded.
3. Select Downloading Options (to change from defaults):
a) Format (default
= MGD77 for Trackline Geophysics or HYD93 for Hydrographic Surveys)
b) Horizontal Datum (default
= North American Datum 1983)
c) Parameters (default
= all records regarless of parameter)
d) Convert uncorrected depths
to corrected meters using Carter's Tables (default = do not apply
Carter's corrections).
4. Download or Cancel (choose one):
a) Use dialog to choose location and name of downloaded file, or in the case of
multiple survey files, choose location.
b) Download will start downloading process, prompting
you for the location of each CD/DVD volume as needed.
c) Cancel will cancel all options and exit the Download
Task.
NOTE: Direct Downloading of Aeromagnetic Data is not availablewith this GEODAS Software. For more information on obtaining this data from NGDC, please contact: Ron Buhmann (303) 497-6128 Ron.W.Buhmann@noaa.gov