Take the 2-minute tour ×
Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. It's 100% free, no registration required.
  1. I have a digital elevation model (DEM) with a point location defined.

  2. I want to locate the lowest height values at a set distance from this point.

  3. I envisaged creating a buffer around the point and then locating the lowest height values; firstly is this the best way of achieving this, if not can you recommend another option ?

  4. If it is the best way, once the buffer is created around the point, how do I extract DEM cells with the lowest height values? I dont want to know what their values are, I want to be able to identify the cells and know where the cells are.

Thanks for any assistance you can provide.

share|improve this question
2  
What software do you plan on using for this? if you don't have any specific software in mind, edit your question to say so and you'll have folks also suggest software too (probably free/open source) in any answers. –  GIS-Jonathan Oct 31 '12 at 12:49
1  
Do you want "at a set distance" or "within a set distance"? –  BradHards Oct 31 '12 at 12:51
1  
Sorry Im using ArcMap 10 –  Malcolm Whitworth Oct 31 '12 at 13:19
1  
Within a max distance –  Malcolm Whitworth Oct 31 '12 at 13:20
add comment

1 Answer 1

I think you can create a buffer, then clip your DEM to this buffer (see this or this), and then this clipped DEM circle you can reclassify to show the lowest cells. Or just use Classified symbology in properties.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.