<div>Basically I need to do the following:</div>
<div> </div>
<div>1. Check if the image already exists in the cache.</div>
<div>2. If not then check for the image with the provider by utilizing a url that returns a value.</div>
<div>3. Check the value and If still no image then try another WMS service provider.</div>
<div>4. If still no image then return a noimage tile.</div>
<div> </div>
<div>Can you direct me to the best python resource for these things?</div>
<div> </div>
<div>Thanks so much!</div>
<div>Linda Rawson<br> </div><br><br>
<div><span class="gmail_quote">On 10/15/07, <b class="gmail_sendername">Christopher Schmidt</b> <<a href="mailto:crschmidt@metacarta.com">crschmidt@metacarta.com</a>> wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">On Sun, Oct 14, 2007 at 09:31:02PM -0700, Linda_Rawson wrote:<br>><br>> Digital Globe has this inherent problem that when they don't have an image it
<br>> will return the same image at a lower resolution. It really should return a<br>> noimage tile. What I would like to do is customize the python scripts so<br>> that if we did not have a tile cached it would first query the service to
<br>> find out if there is an image and if there is no image then it would return<br>> a notile image. Which python script would I change to do this?<br><br>You're going to want to create a Layer subclass specifically for Digital
<br>Globe, in the Layer.py file.<br><br>Regards,<br>--<br>Christopher Schmidt<br>MetaCarta<br></blockquote></div><br>