AutoCAD Map 3D General Discussion

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jens.kuegl
Posts: 20
Registered: ‎07-25-2011
Message 1 of 8 (538 Views)
Accepted Solution

legend and attributes of a WMS service

538 Views, 7 Replies
06-14-2012 07:50 AM

I use a WMS service as a FDO datasource in AutoCAD Map. This works well.

- How can I view the legend (GetLegendGraphic)?
- How can I access the attributes (GetFeatureInfo)?

Any help would be greatly appreciated.
 
Regards
Jens

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phil_borycens
Posts: 185
Registered: ‎10-25-2011
Message 2 of 8 (519 Views)

Re: legend and attributes of a WMS service

06-15-2012 04:11 PM in reply to: jens.kuegl

Hi Jens,

 

Good question - this all depends on the WMS service and how they setup their sites. You might be able to change the connection string after the "?" to GetLegendGraphic or GetFeatureInfo from whatever you had originally, but those are only going to work if they actually have those parameters defined.

 

This site has a good explanation of how their WMS services work:

http://www.nationalatlas.gov/infodocs/ogcwms.html

 

I hope this makes sense.

 

Thanks!

Phil



Phil Borycens
Contributor
jens.kuegl
Posts: 20
Registered: ‎07-25-2011
Message 3 of 8 (503 Views)

Re: legend and attributes of a WMS service

06-18-2012 02:08 AM in reply to: phil_borycens

Phil,

thanks for the answer.

1. Legend
If I understood you correctly, I have to make the GetLegendGraphic request outside AutoCAD Map. This works, but it would also be nice to have a button in AutoCAD Map to show the legend. If there is no button inside AutoCAD Map, then I make the request via a browser - that's ok.

2. Attributes
I know that I can use a GetFeatureInfo in a browser to get the attributes of an object. But this is not quite useful because I have to know the x/y coordinates: “….REQUEST=GetFeatureInfo&X=98765&Y=12345….”
Is there no button inside AutoCAD Map to make a GetFeatureInfo request?

Regards

Jens

Product Support
phil_borycens
Posts: 185
Registered: ‎10-25-2011
Message 4 of 8 (493 Views)

Re: legend and attributes of a WMS service

06-18-2012 04:44 PM in reply to: jens.kuegl

There are no buttons in AutoCAD Map 3D to make these requests. WMS is an image service. If you are looking for attribute data that is associated with map features, maybe you really need a WFS (vector) service?



Phil Borycens
Contributor
jens.kuegl
Posts: 20
Registered: ‎07-25-2011
Message 5 of 8 (486 Views)

Re: legend and attributes of a WMS service

06-19-2012 02:30 AM in reply to: phil_borycens

Phil,

 

thank you for confirming that AutoCAD Map has no button for a GetFeatureInfo-request and a GetLegendGraphic-request.

 

For the GetLegendGraphic-request you can easily use the browser.

 

But for the GetFeatureInfo-request, it would be useful to have a button in a future AutoCAD Map release. Other GIS have such a button to retrieve the attributes of an objekt in a WMS service.

 

Thanks for the help

 

Jens

*Expert Elite*
antoniovinci
Posts: 1,594
Registered: ‎06-03-2011
Message 6 of 8 (482 Views)

Re: legend and attributes of a WMS service

06-19-2012 04:55 AM in reply to: phil_borycens

borycep wrote:

WMS is an image service


It doesn't matter, sir: the info you can get from it, depend on what a given WMS server can offer.

 

For instance, here's a WMS layer from the Italy's Environment Department:

http://wms.pcn.minambiente.it/ogc?map=/ms_ogc/WMS_v1.3/Vettoriali/LimitiAmministrativi_2011.map

 

If you query it with an opensource Qgis, you receive full info about the region where you clicked into: check this out.

Contributor
jens.kuegl
Posts: 20
Registered: ‎07-25-2011
Message 7 of 8 (476 Views)

Re: legend and attributes of a WMS service

06-19-2012 05:07 AM in reply to: antoniovinci

Thanks for the example, antoniovinci.

The example clearly shows that a GetFeatureInfo-request is very important. All areas in the map look the same. Only by using a GetFeatureInfo-request I can access the attributes and use the information about the areas.

Jens

Contributor
jens.kuegl
Posts: 20
Registered: ‎07-25-2011
Message 8 of 8 (459 Views)

Re: legend and attributes of a WMS service

06-21-2012 05:31 AM in reply to: jens.kuegl

The German Autodesk support has given the solution: AutoCAD Map 2013 has a function to query the attributes of an object in a WMS service!


-    In Display Manager, right-click a WMS layer.
-    Click Get WMS Feature Information.
-    Click Raster Layer tab - View panel - WMS Feature Information.
-     Click a point on the image
-    The WMS Feature Information dialog box is displayed.

This seams to be a new feature in the 2013 release of AutoCAD Map. I can not test is because I only have 2012.

Jens

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