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Editorial Team
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Asked: 2026-05-22T14:40:34+00:00

I am trying to pull some KMZ files over the net and overlay them

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I am trying to pull some KMZ files over the net and overlay them on Google Maps. I have looked at Apple’s kmlParser example, which is very close to what I want to do, however in its current form it can only parse KML files. Most of the RSS feeds and google data on the net however seems to be in KMZ format (which I believe is a zipped version of KML files). Is it possible to unzip the KMZ files programmatically in Xcode?

- (void)viewDidLoad

{
[super viewDidLoad];

// Locate the path to the route.kml file in the application's bundle
// 
//NSURL *path = @"http://earthquake.usgs.gov/earthquakes/catalogs/eqs7day-age.kmz";
//NSURL *url = [[NSURL alloc] initWithString:@"http://earthquake.usgs.gov/earthquakes/catalogs/eqs7day-age.kmz"];
//kml = [[KMLParser parseKMLAtURL:url] retain];    // and parse it with the KMLParser.
NSString *path = [[NSBundle mainBundle] pathForResource:@"doc" ofType:@"kml"];
kml = [[KMLParser parseKMLAtPath:path] retain];    // and parse it with the KMLParser.


// Add all of the MKOverlay objects parsed from the KML file to the map.
NSArray *overlays = [kml overlays];
[map addOverlays:overlays];

In the above code snipped, I have also tried using the NSURL method (commented out lines), but it doesn’t work. I have to manually download the KMZ file, unzip it and then feed it to the KML parser and ideally I would like to do that within the program itself.

I will appreciate any help or guidance on how to solve this problem.

Soofi

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1 Answer

  1. Editorial Team

    You are right that KMZ files are simply zipped up KML files. The appropriate part of the documentation is here.

    The Apple KML example is very simplistic. If you want a fuller featured parser, I would recommend libKML. It has full support for the KML standard, and handles KML and KMZ files. The only catch is that it is written in C++, and uses intrusive pointers which can be a bit painful in Obj-C.

    If you really want to write your own parser, and just need a way to unzip files, ZipKit should work for you.

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