Hi Marco,<br><br><div class="gmail_quote">On Tue, Jun 5, 2012 at 4:54 PM, Marco Jorge <span dir="ltr"><<a href="mailto:marco_gjv@ymail.com" target="_blank">marco_gjv@ymail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div><div style="font-size:10pt;font-family:tahoma,new york,times,serif"><div>Hi,</div><div><br></div><div>I have 10k small polygons stored in a shapefile and in raster format (nr classes = nr of basins). </div><div>I am interested in getting some planar geometry information for each polygon.</div>
</div></div></blockquote><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="font-size:10pt;font-family:tahoma,new york,times,serif"><div>I have 3 problems, not considering the lack of knowledge: </div>
<div><br></div><div>- no DTM; </div><div>- no channels; </div><div>- try to foul r.basin with the shapefile</div><div><br></div><div><span style="font-size:10pt">Can you think of a way to pick the module and its code to calculate the indices in the end of the post? </span></div>
<div><span style="font-size:10pt">Can anyone point me a way to pick up the major axis instead of the lenght of the main channel ? </span></div><div><span style="font-size:10pt">Any hint on major (or minor) axis
extraction?</span></div><div><br></div><div>Should I try other approach? </div></div></div></blockquote><div><br></div><div>To me, it's not clear what you are trying to get. If your aim is to perform a hydrological analysis, you do need a DEM, and you can easily download i.e. an ASTER GDEM for your area and then use r.basin. If your analysis it's not related to hydrology, and you just need some "shape indexes", what you should do is probably related to what you are trying to achieve.. Can you explain a little more?</div>
<div><br></div><div>Regards,</div><div>madi</div><div><br></div><div><br></div></div>-- <br>Dr. Margherita Di Leo<br>