Question

In my program the memory is leaking while adding the place1 in the mapArray1
I have released the mapArray1 in dealloc method. then also leaking where I have to release the mapArray1?

place1 = [[NSMutableDictionary alloc] init];
for(i=0;i<[array count];i++)
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    [place1 setObject:@"1" forKey:@"ID"];
    lati=[array1 objectAtIndex:i];
    [place1 setObject:lati forKey:@"latitude"]; 
    long i = [array2 objectAtIndex:i];
    [place1 setObject:longi forKey:@"longitude"];
    [mapArray1 addObject:[place1 copy]];
    [pool release];
}

Answer 1

The leak is coming from [place1 copy]. Either replace it with [[place1 copy] autorelease] or use a temporary variable and release it after you add it to mapArray1.

From the docs:

You take ownership of an object if you create it using a method whose name begins with “alloc”, “new”, “copy”, or “mutableCopy” (for example, alloc, newObject, or mutableCopy), or if you send it a retain message.

Also, I doubt you need to recreate those autorelease polls in each cycle…