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
--
Imagine Aerial
On July 3, 2017 at 8:32:52 AM, Lukas Winiwarter [via OSGeo.org]
([email protected](mailto:[email protected]))
wrote:
>
>
> Hi Mike,
>
>
>
> 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?
>
>
> 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.
>
>
> 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
>
>
>
> "ELEV" > 0 AND "ELEV" < 10
>
>
> 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.
>
>
>
> Cheers,
> Lukas
>
>
>
> 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:
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> >
> >
> >
> >
> >
> > View this message in context: Re: limiting contour lines to range of
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> --
> Lukas Winiwarter Stud. Ass. Tel: +43-(0)1-58801-12246 Fax:
> +43-(0)1-58801-912246 Email: [hidden
> email](/user/SendEmail.jtp?type=node&node=5326496&i=1)
> http://photo.geo.tuwien.ac.at/
> TU Wien, Department of Geodesy and Geoinformation (E120), Research Group
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>
>
>
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