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

[Lukas Winiwarter]

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
>
>
> photo 
> <http://link.wisestamp.com/wf/click?upn=vpKJERi1tY7PB5Tngc96A1yhcA3YssgqhW2CXQtXY0zLixRK-2BOixNcgngO7BawJe_lBa7v2o5b2dBFosQcE4zGwBkWF-2BUh5yCJbpX-2FrM-2Br27CIySWBsHuCBDZeoJH-2FtYy-2FLOUqrTkcZ360-2BJRttDM7TeMLJ-2FaYNRWOQR7HynrYXO6B7r6U5JPaC-2FS1LXzjPdn-2BBGBo9lR8PpiezKhyjYT6RwuU6O91w5XLDXq6RyVGPh2Yn8a9YQxTVLno7mIQZjZLRIgfizlancQAuWxSDIoQOqCWzm-2BsrIy3l7gPXrDcT1pXZkkOYpFVI-2BH638xoN1zIoVKo4rk5H-2BA0SmZOmiwfw-3D-3D> 
> <http://link.wisestamp.com/wf/click?upn=yERdA-2F0p-2F761pa-2Fiulqrifyu0UogTJi6N9uTP-2B4omY-2FY0VRAaVCQNcnBk3GfLqjh_lBa7v2o5b2dBFosQcE4zGwBkWF-2BUh5yCJbpX-2FrM-2Br27CIySWBsHuCBDZeoJH-2FtYy-2FLOUqrTkcZ360-2BJRttDM7c6lwCv-2BG2X6MUVJv6EK7n-2BMdvLfPKjcODY7WdQSosclfEMAfIqw4Le-2BimH3OOXkZd3CJ1iM1ph5IEIRwbiRLIoTFauuGymlOaRnqS9hvEQRGMRmkFAHFUS-2F5hi-2FOM8rh27WitUsACfVr7z-2Bz4eDKDz5wJHI0Zz3xH0blC2gXybVEw3NKHNkA1sgs1OFa0FdSQ-3D-3D> 
> <http://link.wisestamp.com/wf/click?upn=frqkw0-2BXQfUAqxIenKLOlO66scExZFTbzREOmSOOXIGyzB7oiatH4RfFCs3a1ltK_lBa7v2o5b2dBFosQcE4zGwBkWF-2BUh5yCJbpX-2FrM-2Br27CIySWBsHuCBDZeoJH-2FtYy-2FLOUqrTkcZ360-2BJRttDM7R3e8dhsEc9x4RVxaZlfTzwaVdv-2FCM-2Fx2Bgi-2BFqwqRFg2e-2F2h30GxBcubdot9dvLsMpxa8GZm8TIcDMVEbVMbbwVbQ-2FExjoHi9xQrESNETSVzwLKvU8q-2FZMMV14sBMV3rcODTgHSWItlAl24HM-2BmaUnMTph-2FcBKW4uNg8hSrkkWcj2en-2Fb83-2FOnF1Tkcrxy74Q-3D-3D> 
> <http://link.wisestamp.com/wf/click?upn=LgCARJHnjtd3UE8bx6jzprVeOLOXU0Sv5i3Om6jK28PNj3S2EuN21vx2CL8vCQYy_lBa7v2o5b2dBFosQcE4zGwBkWF-2BUh5yCJbpX-2FrM-2Br27CIySWBsHuCBDZeoJH-2FtYy-2FLOUqrTkcZ360-2BJRttDM7dv974ecgoHCP9wndqT4Wh5dZ7kycnfpcDDOSbDDaNQdEzjM3GR8nRs-2BfIdotN55ycxEEaGgpamdUg1argxGpDVHIrB-2F8vdWbhpc9s8IZ5-2BGZcw9RZz0W-2BuyTL63UiJQcGNDdplAMwAqYzy2klnVST-2Faim-2FIgv5-2FuskVJsaB-2F-2BV4KQHQozdJU9wjn6prtJW6ng-3D-3D> 
> 	
> 	Michael J Finn III
> Owner, FAA Certified Remote Pilot, Imagine Aerial, LLC
> <a href="tel:c. 443-942-0345" style="display: inline-block; 
> box-sizing: content-box; color: rgb(136, 136, 136); text-decoration: 
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> www.imagine-aerial.com 
> <http://link.wisestamp.com/wf/click?upn=JpWBgyEnwHH-2BZ-2F6q0khuJD5JN0xpRQ1k8-2BVCLNUxNzhjjH-2F7GQjAU4h1FvfPHV0l_lBa7v2o5b2dBFosQcE4zGwBkWF-2BUh5yCJbpX-2FrM-2Br27CIySWBsHuCBDZeoJH-2FtYy-2FLOUqrTkcZ360-2BJRttDM7VzqMkJB5i7dLD1ZL6dLZjvPP-2F3hR1Hv4wjprwzrj2wQ8Yqy4ZmIoJVePWWIRG8JPL5pF7jvNZDWRRfqbX0aZOOO7tyiGedvftxQe5JDQakPblnteelRnv56t5zeoVfbSzXFHDPbUevA72cozFp4EotfAq5wSIKrDR3vQgJYr-2FOJv6IRY2-2B4wPcXeN0jS5Rudg-3D-3D>[hidden 
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-- 

Lukas Winiwarter
Stud. Ass.
Tel: +43-(0)1-58801-12246
Fax: +43-(0)1-58801-912246
Email: lukas.winiwarter at tuwien.ac.at
http://photo.geo.tuwien.ac.at/

	

TU Wien,
Department of Geodesy and
Geoinformation (E120),
Research Group Photogrammetry
Gußhausstraße 27-29
1040 Vienna, Austria

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