This tool
converts GPS routes from different input formats
(NMEA-0183 sentences .nmea, GPX XML .gpx) into
different output formats (NMEA-0183 sentences .nmea, ) for
Overlay in Google Earth, Google Maps and Map24 maps ( .kml).
Intevation.Net
A survey of conversion software for Linux you may find at Intevation.
GDAL
The
Geospatial Data Abstraction Library (GDAL)
is a unifying C/C++
API for accessing raster geospatial data, and currently includes formats
like GeoTIFF, Erdas Imagine, Arc/Info Binary, CEOS, DTED, GXF, and SDTS. It
is intended to provide efficient access, suitable for use in viewer
applications, and also attempts to preserve coordinate systems and
metadata. Python, C, and C++ interfaces are available.
