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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | RE: GISList: Controlling Zoom in ArcIMS |
| Date: |
01/17/2002 12:55:16 PM |
| From: |
Todd Helt |
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Chris,
Here's what we do with our customized version of ESRI's Default HTML Viewer:
We use custom code to do a couple of things so users don't get lost in the
zoom level. First, we use a "real" scale indicator (1:100,000) as opposed
to the scale ratio decimal used in ESRI's Default HTML Viewer (.00001). We
also do the coordinate transformations so the user gets both scrolling
lat/lon and scrolling map coordinates. We also have added a custom button
for "Zoom to Point" so the user can easily zoom to the appropriate location
based on DD, DMS, or map coordinates. Then we added a custom "Zoom to
Scale" function so the user can easily get to the set of predefined zoom
levels (scale) or a user specified scale.
You can see MaplicityHTML here, including a fairly complete set of data for
San Francisco Bay:
http://www.telemorphic.com/loadpage.php?width=1004&page=bard
Our MaplicityHTML viewer and the code is included with the purchase of a low
cost Maplicity web server license. If you are looking for a more
interactive desktop GIS-like interface, with much improved functionality
(including image visualization tools), Maplicity is our 100% Java applet
client for ArcIMS image services. Maplicity includes three scalable
deployment options (one HTML plus two Java applets). Maplicity is available
for both ArcIMS 3.0 and 3.1.
If you want to compare functionality, you can see all three of the Maplicity
ArcIMS viewers deployed with the same data (Afghanistan):
http://www.telemorphic.com/afghan.htm
Please contact us directly if we can be of assistance with your Internet GIS
needs.
Best regards,
Todd
----------------------------------------------
Todd F. Helt
President
Telemorphic, Incorporated
748 Gilman Street
Berkeley, CA 94710-1327
Ph: (510) 527-8343
Fax: (510) 527-8364
toddh@telemorphic.com
www.telemorphic.com
> -----Original Message-----
> From: Weaver, Chris [mailto:CWeaver@icfconsulting.com\
> Sent: Wednesday, January 16, 2002 1:19 PM
> To: GIS List
> Subject: GISList: Controlling Zoom in ArcIMS
>
>
> After trolling the user discussions and searching the net, I have
> come to no conclusion, so I pose this to the group.
>
> You have a an ArcIMS 3.0 application. You allow people to zoom
> in/out. Layers turn on and off based upon scales (zoom levels).
> At some point they've zoomed in farther than you have data for
> and then your client becomes lost. How do you prevent a user
> from zooming in past a certain level? Maybe repeating the last
> level that you allow, or "graying" the zoom button? Is there a
> function I'm missing O.T.S (off-the-shelf) or is it all custom
> code that might handle this.
>
> If someone could point me in the right direction, it would be appreciated.
>
> Thanks
>
> Chris
>
>
> Sorry for cross-posting....
>
>
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