<div dir="ltr"><div class="gmail_quote"><p>Dear GRASS Team<br></p>
    <p>I am running a global analysis where I need to use "tiles" as
      computational units in which I use the following three commands:</p>r.watershed -b elevation=elv depression=dep accumulation=flow drainage=dir_rw flow=pixel_area  memory=100000 --o --verbose <br>r.stream.extract elevation=elv accumulation=flow depression=dep threshold=0.05 direction=dir_rs stream_raster=stream memory=100000 --o --verbose <br>r.stream.basins -l  stream_rast=stream direction=dir_rs   basins=lbasin  memory=100000 --o --verbose 
    <div><br></div><div>The basins that were not completely within a tile (resulting in
      broken-basins) have been removed (see below the three tiles in
      Figs. 1,2,3 including only entire basins), </div>
    <div>and now I'm in the phase of merging all the tiles having only
      complete basins.<br>
    </div>
    <div><br>
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    <div>When I merge the tiles (Fig 4), some basin borders do not match
      perfectly, and some areas have NoData (see Fig 5,6) or have the
      Basin ID of the below basin (Fig 7).  </div>
    <div>I noticed that these phenomena appear only when I merge tiles
      that have very large broken-basins that can not be included in the
      tile due to RAM limitations.</div>
    <div><br>
    </div>
    <div>My thought is that r.stream.basins needs the entire dimension
      of two adjacent basins to be able to detect the border without gap
      and without a potential random selection. </div>
    <div>Is there any part of the r.stream.basins code that I can potentially check and eventually hack to avoid this problem? </div>
    <div><br>
    </div>
    <div>For the rest, all the RAM limitation and other problem have been
      solved soon we will have a global stream network and basin
      delineation performed 100% in GRASS!!! </div><div><br></div>
    <div>Thank you </div>
    <div>Best Regards </div>
    <div>Giuseppe <br>
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        <div>
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          <div>Fig 1. Left Tile</div>
          <div><img src="cid:171e628adb9cb971f161" alt="image.png" width="542" height="343"><br>
          </div>
        </div>
        <div><br>
        </div>
        <div><br>
        </div>
        <div>Fig 2. Center tile </div>
        <div><img src="cid:171e628adb9cb971f162" alt="image.png" width="312" height="524"><br>
        </div>
        <div><br>
        </div>
        <div><br>
        </div>
        <div>Fig 3. Right Tile </div>
        <div><img src="cid:171e628adb9cb971f163" alt="image.png" width="542" height="247"><br>
        </div>
        <div><br>
        </div>
        <div><br>
        </div>
        <div>Fig 4. Merge all the tiles </div>
        <div><img src="cid:171e628adb9cb971f164" alt="image.png" width="542" height="286"><br>
        </div>
        <div><br>
        </div>
        <div><br>
        </div>
        <div>Fig 5. Gap -> small white area </div>
        <div>
          <div><img src="cid:171e628adbacb971f165" alt="image.png" width="542" height="366"><br>
          </div>
        </div>
        <div><br>
        </div>
        <div><br>
        </div>
        <div>Fig 6. Gap -> small white area <br>
        </div>
        <div><img src="cid:171e628adbacb971f166" alt="image.png" width="518" height="542"><br>
        </div>
        <div><br>
        </div>
        <div>Fig 7. boarder Basins inconsistency among tiles  <br>
        </div>
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        </div>
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          <div><img src="cid:171e628adbacb971f167" alt="image.png" width="563" height="177"><br>
          </div>
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        <div><br>
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        -- <br>
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                                                        <div>Giuseppe
                                                          Amatulli,
                                                          Ph.D.<br>
                                                          <br>
                                                          Research
                                                          scientist at<br>
                                                          <span>School
                                                          of Forestry
                                                          &
                                                          Environmental
                                                          Studies<br>
                                                          </span><span>Center
                                                          for Research
                                                          Computing</span><br>
                                                          Yale
                                                          University</div>
                                                        <div>New Haven,
                                                          CT, USA</div>
                                                        <div>06511<br>
                                                          <div>
                                                          Teaching: <a href="http://spatial-ecology.net" target="_blank">http://spatial-ecology.net</a></div>
                                                          Work:  <a href="https://environment.yale.edu/profile/giuseppe-amatulli/" target="_blank">https://environment.yale.edu/profile/giuseppe-amatulli/</a>
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