Processing KMZ in Mathematica

Question

I'm stuck on a conversion.

I have a KMZ file with some coordinates. I read the file like this:

m=Import["~/Desktop/locations.kmz","Data"]

I get something like this:

{{LayerName->Point Features,
  Geometry->{
    Point[{-120.934,49.3321,372}],
    Point[{-120.935,49.3275,375}],
    Point[{-120.935,49.323,371}]},
  Labels->{},LabeledData->{},ExtendedData->{},
  PlacemarkNames->{1,2,3},
  Overlays->{},NetworkLinks->{}
}}

I want to extract the {x,y,z} from each of the points and also the placemark names {1,2,3} associated with the points. Even if I can just get the points out of Geometry->{} that would be fine because I can extract them into a list with List@@@, but I'm lost at the fundamental part where I can't extract the Geometry "Rule".

Thanks for any help,

Ron

Answer 1

While Leonid's answer is correct, you will likely find that it does not work with your code. The reason is that the output of your Import command contains strings, such as "LayerNames", rather than symbols, such as LayerNames. I've uploaded a KML file to my webspace so we can try this using an actual Import command. Try something like the following:

in = Import["http://facstaff.unca.edu/mcmcclur/my.kml", "Data"];
pointList = "Geometry" /.  
    Cases[in, Verbatim[Rule]["Geometry", _], Infinity];
pointList /. Point[stuff_] -> stuff

Again, note that "Geometry" is a string. In fact, the contents of in look like so (in InputForm):

{{"LayerName" -> "Waypoints", 
  "Geometry" -> {Point[{-82.5, 32.5, 0}]}, 
  "Labels" -> {}, "LabeledData" -> {}, 
  "ExtendedData" -> {}, "PlacemarkNames" -> {"asheville"}, 
  "Overlays" -> {}, "NetworkLinks" -> {}}}

Context: KML refers to Keyhole Markup Language. Keyhole was a company that developed tools that ultimately became Google Earth, after they were acquired by Google. KMZ is a zipped version of KML.