<div dir="ltr">Michel,<div>thank you - i'll try your r.mapcalc and vector suggestions.</div><div>Janet</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Mar 3, 2016 at 8:22 AM, Michel Wortmann <span dir="ltr"><<a href="mailto:wortmann@pik-potsdam.de" target="_blank">wortmann@pik-potsdam.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
  
    
  
  <div text="#000000" bgcolor="#FFFFFF">
    HI Janet,<br>
    can you specify what you mean by 'fully connected stream network'?
    'connected' doesnt mean much on a raster map or did you convert it a
    vector?<br>
    I would try to build your stream network from the accumulation
    raster map by thresholding it with a certain catchment size (in
    cells). Eg.<br>
    r.mapcalc exp='streams=if(accumulation>1000, 1, null())'<br>
    That way you see what is happening in the accumulation map as a
    result of the DEM.<br>
    Best,<br>
    Michel<div><div class="h5"><br>
    <br>
    <div>On 03/02/2016 08:42 PM, Janet Choate
      wrote:<br>
    </div>
    <blockquote type="cite">
      <div dir="ltr">Hi Will,
        <div>When running r.watershed on a small 35 hectare watershed,
          it produces a fully connected stream network. However, when
          running r.watershed on a 6400 hectare watershed, the stream
          network is not fully connected.</div>
        <div>No preprocessing with regards to merging different raster
          maps, however, I did try using r.fill.dir first to deal with
          any possible depressions that might be causing non-connected
          stream segments.</div>
        <div>thanks,</div>
        <div>Janet</div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Wed, Mar 2, 2016 at 11:22 AM, Will
          Fields <span dir="ltr"><<a href="mailto:will.openfields@gmail.com" target="_blank">will.openfields@gmail.com</a>></span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div dir="ltr">Hi Janet,
              <div><br>
              </div>
              <div>Can you give some more information about what you
                mean by larger watershed basins?  Did you do any
                preprocessing of the elevation raster before you tried
                to extract the stream networks?  Were you using an
                elevation raster that had been merged from different
                rasters?  I've ran into issues in the past where "seams"
                along the original edges of a raster resulted in odd
                stream networks.  </div>
              <div><br>
              </div>
              <div>Will</div>
            </div>
            <div class="gmail_extra"><br>
              <div class="gmail_quote">
                <div>
                  <div>On Wed, Mar 2, 2016 at 11:40 AM, Janet
                    Choate <span dir="ltr"><<a href="mailto:jsc.eco@gmail.com" target="_blank"></a><a href="mailto:jsc.eco@gmail.com" target="_blank">jsc.eco@gmail.com</a>></span>
                    wrote:<br>
                  </div>
                </div>
                <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
                  <div>
                    <div>
                      <div dir="ltr">Hi GRASS community,
                        <div>When creating a stream network with
                          r.watershed, I end up with some isolated
                          stream segments - particularly in larger
                          watershed basins. Does anyone know how to
                          generate a stream network that is fully
                          connected, or how to correct this issue?</div>
                        <div>thank you,</div>
                        <div>Janet<br clear="all">
                          <div><br>
                          </div>
                          <br>
                        </div>
                      </div>
                      <br>
                    </div>
                  </div>
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                </blockquote>
              </div>
              <br>
            </div>
          </blockquote>
        </div>
        <br>
        <br clear="all">
        <div><br>
        </div>
        -- <br>
        <div>
          <div dir="ltr">
            <div>
              <div dir="ltr">Tague Team Lab Manager</div>
              <div>1005 Bren Hall</div>
              <div>UCSB, Santa Barbara, CA.</div>
            </div>
          </div>
        </div>
      </div>
      <br>
      <fieldset></fieldset>
      <br>
      <pre>_______________________________________________
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    </blockquote>
    <br>
  </div></div></div>

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<a href="http://lists.osgeo.org/mailman/listinfo/grass-user" rel="noreferrer" target="_blank">http://lists.osgeo.org/mailman/listinfo/grass-user</a><br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr">Tague Team Lab Manager</div><div>1005 Bren Hall</div><div>UCSB, Santa Barbara, CA.</div></div></div></div>
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