GEOTRANS Main Window
The GEOTRANS main window consists of the
following elements, from top to bottom:
-
a
Datum pull-down list (which is simulated in
Motif using a text field, a button labeled with a down arrow, and a pop-up
menu), which displays the code and name of the currently selected datum, and
which you can use to select a different datum,
-
an
Ellipsoid field, which displays the code and
name of the reference ellipsoid associated with the currently selected datum,
-
the
name of the currently selected coordinate reference frame type,
-
a
set of zero or more parameter fields and/or controls for the currently selected
coordinate reference frame type, and
-
a
set of coordinate fields and/or controls for the currently selected coordinate
reference frame type, which you can use to specify coordinate values that are
to be converted, and
– the standard error fields, in which input coordinate accuracy values can be entered, and which display output coordinate accuracy values for the most recent conversion. There are three fields. The 90% circular error (CE), in meters, estimates the horizontal accuracy of the output coordinates. The 90% linear error (LE), in meters, estimates the vertical accuracy of geodetic heights. The 90% spherical error (SE), in meters, estimates the three-dimensional accuracy of geocentric and local Cartesian coordinates.
– the Source pull-down menu, which displays the names of possible sources for input sources. These include GPS coordinates, various types of hardcopy maps, and various types of digital geospatial data. Selecting one of these entries causes all three of the standard error fields to be set to values appropriate for the selected source.