Google Earth (Keyhole) Markup Language (kml)
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## Google Earth (Keyhole) Markup Language (kml)

This format can...

- read and write waypoints

- read and write tracks

- read and write routes

This format has the following options: deficon, lines, points, line_width, line_color, floating, extrude, trackdata, trackdirection, units, labels, max_position_points .

KML, the Keyhole Markup Language, is used by Keyhole and Google Earth.

There are concepts in KML that GPSBabel can't support very well on read becuase they don't map well into other programs. For example, KML has ideas of camera views and names and descriptions can have arbitrarily complicated HTML in them. KML files may have tiered "Styles" which can identify sizing info and URLs of associated icons. Reading such files with GPSBabel - even if your goal it to out to KML - can often have suprising results. Simple files with waypoints and paths (which GPSBabel represents internally as tracks) work fine.

Google Earth also uses GPSBabel internally for receiver communications and several file format imports and exports.

In general, GPSBabel's KML writer is relatively strong. GPSBabel handles simple KML on read fairly well, but if you're dealing with handcrafted KML that uses extensive features that have no analog in other formats like nested folders, ringgeometry, camera angles, and such, don't expect GPSBabel to do well with them on read.

Google Earth 4.0 and later have a feature that can suprise users of this format. Earth's "time slider" feature controls what timestamped data gets displayed. If you're using data that has timestampes (e.g. GPX points that contain time or almost any track data) this will be important to you. The time slider defaults to the far left position and fully closed. This means that only the first data point will be displayed. You can tweak Earth's settings to "view->show time->never" or you can widen the time slider to show the range of data of interest.

See Google Earth's documentation on timelines for more info.

### `deficon` option

Default icon name.

This option specifies the default name for waypoint icons

### `lines` option

Export linestrings for tracks and routes.

When this option is nonzero, GPSBabel draws lines between points in tracks and routes. The default value for this option is 1, which causes lines to be drawn by default. To disable line-drawing, specify `lines=0`.

### `points` option

Export placemarks for tracks and routes.

When this option is nonzero, GPSBabel draws placemarks for tracks and routes. The default value for this option is 1, which causes placemarks to be drawn. To disable drawing of placemarks, specify `points=0`.

### `line_width` option

Width of lines, in pixels.

This option specifies the width of the drawn lines in pixels. The default value is six pixels.

### `line_color` option

Line color, specified in hex AABBGGRR.

This option specifies the line color as a hexadecimal number in AABBGGRR format, where A is alpha, B is blue, G is green, and R is red.

### `floating` option

Altitudes are absolute and not clamped to ground.

When this option is nonzero, altitudes are allowed to float above or below the ground surface. By default, this option is zero so that altitudes are clamped to the ground. Specify `floating=1` to allow them to float.

This option is more useful to pilots than to hikers.

### `extrude` option

Draw extrusion line from trackpoint to ground.

This option is a boolean flag to specicy whether Google Earth should draw lines from trackpoints to the ground. It defaults to '0', which means no extrusion lines are drawn. The option of '1' is, of course, most useful for points that aren't actually on the ground such as those be captured from planes.

### `trackdata` option

Include extended data for trackpoints (default = 1).

This is a boolean flag that controls whether GPSBabel writes extensive data for each trackpoint generated. By default computed speed, timestamps, and so on are written with the default of '1' for this option. If you are writing large tracks and do not value this information, you can reduce the size of the generated file substantially by turning this flag off by setting it to '0'.

### `trackdirection` option

Indicate direction of travel in track icons (default = 0).

If set, this options creates directional icons for trackpoints. Arrows will show the direction of travel on drawn tracks and routes.

### `units` option

Units used when writing comments ('s'tatute or 'm'etric).

Units is a simple option. Specify 's' for "statute" (miles, feet, and other things that don't sensibly convert to each other, but are craved by Americans) or 'm' for "metric". Default is 's'.

### `labels` option

Display labels on track and routepoints (default = 1).

When this option is zero, no labels are added for track and route points. This option defaults to one, so labels are added by default.

### `max_position_points` option

Retain at most this number of position points (0 = unlimited).

This option allows you to specify the number of points kept in the 'snail trail' generated in the realtime tracking mode.

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