GISLonConvert

Synopsis

GISLonConvert converts a mesh of longitude (in 0 o to 360 o format), latitude, altitude coordinates to a mesh of longitude (in the East-West,180 o to -180 o , format), latitude, altitude coordinates.

Input Ports

Output Ports

Description

The GISLonConvert module serves a few purposes. It allows you to translate longitude, latitude, altitude (LLA) meshes from 0 o to 360 o format to 180 o to -180 o format. It also reduces potential increased memory requirements because you aren't required to have the standard GIS modules output two meshes with longitudes in both formats.

Although the GIS components in AVS/Express can process longitudes in either 0 o to 360 o format or East-West (180 o to -180 o ) format, the algorithms in the GIS modules work in 0 o to 360 o format.

Input Ports

in

A mesh of longitude, latitude, altitude (LLA) coordinates containing longitudes in 0 o to 360 o format.

Output Ports

out

A mesh of LLA coordinates containing longitudes in East-West (180 o to -180 o ) format

Latitude Conversions

None.

Longitude Conversions

Degree, minute, second (DMS) longitude inputs are constrained from 0 o (0 o E) to 360 o (0 o W). Values outside of these bounds are clipped to fall within the 0 o to 360 o constraints. The following longitude restrictions apply:

• 0 o longitude runs through Greenwich, England.
• Longitudes run positive in an eastward direction.
• 0 o E to 180 o E (+180 o ) is mapped from 0 o to 180 o
• 180 o W (-180 o ) to 0 o W is mapped from 180 o to 360 o .

Altitude Conversions

None

File

v/gis1.v

 




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