[mapguide-users] Geometry vs. Geography. Projections. Distortions

[Jason Birch]

I also noticed an interesting side effect; my image-based symbols
allowed mouse-over tooltips on the entire symbol when both map and
data were in UTM, but when data was in LL only the insertion point was
hover-able.

Jason

On 2009-11-19, Kenneth Skovhede, GEOGRAF A/S <ks at geograf.dk> wrote:
> MapGuide will perform data reprojection if needed, although it costs
> some speed.
> If your data reports the correct projection and your map has the desired
> view projection,
> all should look correct.
>
> You can change the map's projection to whatever you think is best.
>
> If your data reports the wrong projection, you can add a coordinate
> system override on the
> FeatureSource.
>
> For best practices (read: performance), I recommend that you keep data
> and map in the same projection
> whenever possible.
>
> Regards, Kenneth Skovhede, GEOGRAF A/S
>
>
>
> miansi skrev:
>> Hello,
>>
>> I have 2 shape files with geography and geometry data.
>> If I will present geography data on the map it will look distorted.
>> Geometry data looks OK.
>> In real application we would use SQL 2008 instead of shape files to store
>> spatial information.
>>
>> Is it possible to tell (MapGuide/Map?) to apply projection to geography
>> data, so it will not going to look distorted on the map?
>>
>> The reason is - that it is looks like Lat/Long is the "standard"
>> interopability format and we would like to store all our Geo data in
>> Geography format. But when it comes to presenting data we would like to
>> see
>> it in geometry format.
>>
>> Is it possible it all? What are the best practices?
>>
>> Please see image attached.
>> http://n2.nabble.com/file/n4033649/19-11-2009%2B11-42-09%2BAM.png
>>
>>
>> Thank you,
>>
>> Andrei
>>
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