SPCS83 for Google Earth (SPCGE)
This page describes a free application that runs in
Google Earth version 5.0 or later. Please install
Google Earth,
download
SPCGE,
and return to this page to learn more.
SPCGE is a graphical front end for the NGS online tool, SPCS83.
It eliminates the need to input geodetic coordinates and displays the converted
coordinates, convergence angle, and scale factor in a placemark balloon.
To convert geodetic to plane coordinates:
-
Position the point of interest (POI) in the center of the view. One way to
do this is to double-click an unmarked location. To precisely position the
POI in the center of the view, add a placemark at the desired location;
then edit the properties of that placemark and reset the view
(explain).
-
Check the radio button beside the Geodetic to Plane network link.
A form will be presented with read-only coordinates corresponding to
the view center and input fields for zone and units. Converted coordinates,
convergence angle, and scale factor are displayed when the Convert button is pressed.
-
On subsequent uses, reposition the POI and ensure that the network link
is checked and selected. Then choose Refresh from the Edit menu, or right-click
and select Refresh in the context menu.
© 2011 Google
To convert plane to geodetic coordinates:
-
Position the area of interest (AOI) in the viewer.
-
Check the radio button beside the Plane to Geodetic network link.
A form will be presented with input fields for plane coordinates, zone, and units.
Converted coordinates, convergence angle, and scale factor are displayed when the
Convert button is pressed.
-
On subsequent uses, reposition the AOI and ensure that the network link
is checked and selected. Then choose Refresh from the Edit menu, or right-click
and select Refresh in the context menu.
Coverage includes the conterminous United States, Alaska, Hawaii, Puerto Rico,
and the US Virgin Islands. Check the Extents folder to
display the coverage area bounding boxes.
Note: To save SPCGE results from one Google Earth session to another, right-click
on Saved Placemarks and select Save to My Places.
All data are retrieved from remote servers. Data errors,
accuracy, and availability are beyond the control of this application.
SPCGE is a component of
Earth Survey
© 2007-2011
Metzger + Willard, Inc.
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