[mapguide-users] Converting SRS on the fly

[Jim O'Leary]

Yes, this works nicely. You must create the layer and save the markup both as
BC Albers, and then the markup shows up on the map.

And when I want to publish to Google Earth, I can use the code in
MarkupEditor::GetTransform() to transform the geometries in the map from BC
Albers into LL84.

Thanks.



Robert Bray-2 wrote:
> 
> Jim,
> 
> The sample was originally designed so that all markup is stored in LL84. 
> Have a look in markupeditor.php and you'll find all of the AddXXX 
> methods all have a line of code like:
> 
> $point = $point->Transform($this->GetTransform());
> 
> This is what is transforming the coordinates from BC Albers to LL. I did 
> not look to closely but I think you can safely remove those lines in 
> addition to the changes you describe below.
> 
> Bob
> 
> Jim O'Leary wrote:
>> I am using the GT markup sample but I am saving a new layer in LL84 on a
>> map
>> that is in BC Albers. There must be some conversion happening on the fly,
>> because the markup on the map shows up. 
>> 
>> However, when I extract the geometries to a pop up window, they are in
>> lat/lon. This window make links that zoom to the coordinates, but this
>> doesn't work as the coordinates for lat/lon are different than BC Albers.
>> 
>> I have tried changing the following line in the GT sample:
>> 
>> $sdfParams = new MgCreateSdfParams('LL84', MarkupManager::LL84WKT,
>> $markupSchema);
>> 
>> to these two lines
>> $WKT =  $map->GetMapSRS();
>> $sdfParams = new MgCreateSdfParams('BC_Albers', $WKT, $markupSchema);
>> 
>> However, it still saves in lat / lon.
>> 
>> Is there a way to do this conversion on the fly, that is,
>> programmatically?
>> The application does it somehow. Alternatively, how would I save the new
>> layer as BC Albers?
>> 
>> Thanks
>> 
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> 

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