<tt><font size=2>I new to open layers and have looked at all of the examples
and documentation I'm having trouble figuring something out.</font></tt>
<br><tt><font size=2>We are loading some USGS base imagery as a tile map
service (I think this is the correct term) using this call</font></tt>
<br>
<br><tt><font size=2> new OpenLayers.Layer.XYZ("USGS Base Imagery
Map",</font></tt>
<br>
<br><tt><font size=2>but when the layers are no longer available because
the user has zoomed-in the layers don't display. I've talked to a</font></tt>
<br><tt><font size=2>ESRI ArcServer expert and he said "We need to
switch based upon the zoom level from a tile map service to a dynamic map
service."</font></tt>
<br>
<br><tt><font size=2>Can someone give me some hints about displaying layers
as a dynamic map service?</font></tt>
<br>
<br><font size=2 face="sans-serif">I'm doing this at the current time but
it isn't working:</font>
<br>
<br><font size=3> rastermap1 = new OpenLayers.Layer.WMS("USGS
Base Imagery Map", </font>
<br><font size=3> "</font><a href=http://raster1.nationalmap.gov/ArcGIS/rest/services/TNM_Small_Scale_Imagery/MapServer/export><font size=3>http://raster1.nationalmap.gov/ArcGIS/rest/services/TNM_Small_Scale_Imagery/MapServer/export</font></a><font size=3>",
{</font>
<br><font size=3>
projection: "EPSG:900913", sphericalMercator:
true, group: "basemap", meta:false</font>
<br><font size=3>
});</font>
<br><font size=3>
rastermap1.visibility = true;</font>
<br><font size=3>
map.addLayer(rastermap1);</font>
<br>
<br><font size=3>I noticed that this KML call seems to work.</font>
<br><a href="http://raster1.nationalmap.gov/ArcGIS/rest/services/TNM_Small_Scale_Imagery/MapServer/kml/regions/0-1-1.kmz?"><font size=3>http://raster1.nationalmap.gov/ArcGIS/rest/services/TNM_Small_Scale_Imagery/MapServer/kml/regions/0-1-1.kmz?</font></a>
<br><font size=3>where you have near unlimited zoom capability in Google
Earth.</font>
<br>
<br><font size=3>this is the meta data for the layer I'm trying to display
can be found at</font><a href=http:///><font size=3 color=blue> http://raster1.nationalmap.gov/ArcGIS/rest/services/TNM_Small_Scale_Imagery/MapServer</font></a>
<br>
<br><font size=3><br>
</font>
<br><font size=2 face="sans-serif">-- Doug<br>
</font>