Generic GPS point to Flight Trajectory Function

[dbetchkal]

It would be convenient to have a tool to convert generic aviation-related (x, y, z) GPS points to NMSIM trajectory (.trj) files. Right now tracks_within() has a specific solution when provided with a geopandas.GeoDataFrame.

Shapefiles are no problem to convert using geopandas.read_file(), but feature classes would have to be saved as shapefiles, first. An important part of this work would be assessing whether the incoming points have all/partial/none of these fields:

• Elevation (MSL)
• Datetime
• Heading [could easily be computed]
• Velocity (knots) [could be computed]
• N-Number

Other changes for a general function include:

• Ability to override site parameters with (x, y) point in WGS84?
• NVSPL matching requirement into a boolean parameter.
• Handling UTC offset automatically

[dbetchkal]

Most of these features were added with 0e2332f and I've converted the rest to checkboxes.