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

[Brent Fraser]

> 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.

In Western Canada the mathematical approximation of the township/range
system can be good enough for some applications (I'd have to translate our
C code into JavaScript).  But for any kind of accuracy, a polygon approach
is best.  My thought was to send the xy coords back to a server and have
it send a label.  Performance could be poor...

>
> 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.

Perhaps making use of Mapserver's imagemap output?  Or WFS?  That would be
fun!

>
> 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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