[Qgis-user] limiting contour lines to range of elevations

[imagineaerial]

Hi Lucas, it is a raster file and thanks for the detailed instructions, I will give it a go one I get back to the office.  
Thanks again,
- Mike

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Imagine Aerial  

On July 3, 2017 at 8:32:52 AM, Lukas Winiwarter [via OSGeo.org] (ml+s1560n5326496h16 at n6.nabble.com(mailto:ml+s1560n5326496h16 at n6.nabble.com)) wrote:

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> Hi Mike,
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> to start with, it'd be good to know what kind of data you are working with. Is your "DSM" a raster file (i.e. pixels) or a vector file containing the contours?
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> If it's a raster, you can create the contours by selecting "Raster" -> "Extraction" -> "Contour" from the menu, then select your input (raster) file and an appropriate interval, as well as an output file (your contours will be saved here). Also, check the "Attribute name" box and enter something ("ELEV" is a good idea) into the field next to it. This will allow you to filter the contours later.
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> Load the contour file into QGIS, if not done automatically, and right-click on it in the Layers Panel (like Matt suggested). If your height attribute is called "ELEV" and you want to display the lines between 0 and 10 (unit is the same that your raster file was in), you can enter
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> "ELEV" > 0 AND "ELEV" < 10
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> in the "Provider specific filter expression" section. Press OK and you should have what you want. This filter does not change the dataset, and if you load the same file again, you will have the original lines again.
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> Cheers,
> Lukas
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> On 03.07.2017 13:53, imagineaerial wrote:
> > Matt,  
> >  
> > Thanks for the response. I am afraid that I am still pretty new to all of this, would you mind going into a little more detail  
> > for me? For instance, I am not familiar with syntax and SQL. Also, what does field X and Y signify? I am working off of  
> > a simple DSM that was created using a UAV.
> >  
> > Thanks for any additional help!  
> >  
> > - Mike  
> >  
> >  
> >  
> >  
> > Michael J Finn III
> > Owner, FAA Certified Remote Pilot, Imagine Aerial, LLC
> > <a href=<a class="moz-txt-link-rfc2396E" href="tel:c.443-942-0345">"tel:c. 443-942-0345" style="display: inline-block; box-sizing: content-box; color: rgb(136, 136, 136); text-decoration: none;" class="">c. 443-942-0345  
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