Thank you for your replies! I was able to get it to work by doing
this:
First, I declared "var soils;" at the top of my document.
Then, in my initialize function, I gave soils a value before I put my
event listener:
soils = new google.maps.KmlLayer(null);
google.maps.event.addListener(map, 'idle', showSoils);
Finally, I used setMap(null) at the beginning of my function to remove
whatever the current soils overlay was. Now it works!
New form of my function:
function showSoils() {
//remove previous overlay
soils.setMap(null);
var zoomlevel = map.getZoom();
//if the zoom level is close enough
if(zoomlevel>13)
{
//obtain points in database-friendly format:
var bounds = map.getBounds();
var ne = String(bounds.getNorthEast());
var firstcomma = ne.search("[,]");
firstlat = ne.substring(1, firstcomma);
firstlong = ne.substring(firstcomma+2, ne.length-1);
var sw = String(bounds.getSouthWest());
var firstcomma = sw.search("[,]");
secondlat = sw.substring(1, firstcomma);
secondlong = sw.substring(firstcomma+2, sw.length-1);
bcoords = firstlat + " " + firstlong + ", " + secondlat +
" " + firstlong + ", " + secondlat + " " + secondlong + ", " +
firstlat + " " + secondlong + ", " + firstlat + " " + firstlong;
var soils = new google.maps.KmlLayer('http://myfarms.org/
test/soils_in_view.php?bcoords=' + escape(bcoords), { map: map,
preserveViewport: true });
}
}
Hopefully this will be helpful to someone else with the same question.
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