[Geomoose-users] GM 2.0- tiling performance in countyprojections / is it possible to add a custom coordinate to the statusbar while using UTM?

[Bob Basques]

All, 

The Projected X/Y option was oringially intended as a way of displaying the ground cooedinates of the dominant dataset in the GeoMoose install.  Your mention of providing a TownShip/Range output option is an interesting one, problem is, it's not really a real coordinate system, it's more closely related to a polygon ID query.  That being said, I can see the usefulness of adding in a fourth output option related to a polygon mouseover effect that is always on like the existing three projections.  This would allow for any sort of polygon mouseover overlay system. 

Now, I haven't thought this through completely, but I think there would be some performance cost to something like this, because of the readout not being related to a straight mathematical process, but more akin to a ImageMap reader.  Another thought along these lines, might be to allow a user to pick a layer to use as an optional readout, and use a particular attribute from the layer as the readout, even pretty names could be used.  Now if you add this output functionality into the side menu, you might even go so far as to run multiple readout (like at the bottom) but with more data available in the readout.  I can see this being useful for emergency services and such, even switching between GPS tracks (instead of using the mouse exclusively) to control the readout and such, all sorts of potential here, but again, I'm not sure about the potential performance costs related to it. 

Might be something I'm going to investigate further though.  Even if it's only to let everyone tell me it can't be done. 

:c) 

Neat idea though . . . . 

bobb 



>>> Brent Fraser <bfraser at geoanalytic.com> wrote:

Mark,

  I haven't looked at the tiling so I can't comment on the performance issue.

  As for the coordinate display, I see that stock GeoMoose v2.0 now allows for three simultaneous coordinate displays:
- projected X/Y
- geographic Lat/Lon
- USNG

  It would be nice if it was instead a flexible list of any number of reference systems that took lat/lon as input and returned a string to be displayed. 

  I'm interested in displaying Township/Range values for example, so I'd have to write the JavaScript to do the conversion, but it would be nice to be able to easily plug it in stock GeoMoose somewhere, similar to the way custom projections work in v1.6.1.

Brent Fraser

Mark Volz wrote:
> Hello,
>
> 
>
> Our users want to use county projections within our mapping
> application.  In GM 1.6.1 We decided that there was only a minimal
> performance hit for the LMIC WMS service(s) to reproject on the fly. 
> This is not true in GM 2.0.  GM 2.0 allows users the option of using a
> tile scheme on the WMS layers.  I was impressed with the speed of the
> WMS services on the demo.  Recently I ported the GM 2.0 demo over into
> county projections.  I noticed there is a *huge *performance hit if
> tiling is turned on.
>
> 
>
> This left me with a couple options:  1)  I can leave the tiling system
> off, and the WMS performance would be similar to that of a 1.6 app.  2)
> I can abandon the county projection in favor of utm so that I can use
> tile cache and hope that no one complains too much that the map is no
> longer in county coordinates.
>
> 
>
> Another thought I had is if I decided to use UTM (to take advantage of
> tiling) would it be possible for me to display the XY location in county
> coordinates?  If so, does anyone know what file(s) would need to be
> modified so that I can display county coordinates in the status bar?
>
> 
>
> Thanks
>
> 
>
> 
>
> Mark Volz
>
> GIS Specialist
>
> Lyon County, MN
>
> 
>
>
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