<div dir="ltr"><div><div>Perhaps raster calculator can also help you<br><br>Expression:<br><br> (layer>0 and layer <= 1)<br><br>Gives us 1 when sentence is true and 0 for false, for each cell in "layer".<br>
<br></div>Good luck<br><br></div>Carlos<br><div><div><br><br></div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">2014-04-10 9:29 GMT-05:00 Micha Silver <span dir="ltr"><<a href="mailto:micha@arava.co.il" target="_blank">micha@arava.co.il</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="direction:ltr" bgcolor="#FFFFFF" text="#000000">
<div>Using GRASS there are two modules you
can consider. First :<br>
v.to.rast in=... out=... type=point use=val value=1<br>
will convert points into raster cells (at the current region
settings), where any cell that contains at least one point will be
given value 1.<br>
<br>
Next:<br>
r.in.xyz in=... out=... method=sum <br>
will create a raster (at the current region settings) where each
cell will have a value = the count of points in that cell.<br>
<br>
HTH,<br>
Micha<div><div class="h5"><br>
On 04/10/2014 04:20 PM, Colin D. MacLeod wrote:<br>
</div></div></div>
<blockquote type="cite"><div><div class="h5">
<div dir="ltr">
<div style="font-size:12pt;font-family:'Calibri'">
<div>Hi All,</div>
<div> </div>
<div>I’m a fairly experienced GIS user, but I’m new to QGIS.
I’m using version 2.2, and I’m trying to convert a point
data layer into a raster data layer using the Rasterize
tool. The point data layer has an integer field with a value
of 1 for all records, and I want to make a raster data layer
which has a value of one for each cell which has at least
one point in it (some cells have more than one point in
them). When I use the Rasterize tool, it creates the raster
data layer fine, but all cells with have points in them
appear to have a value of 0.995968. I’ve tried editing the
gdal code (even making the resulting raster data layer an
integer layer), but I still cannot get it to produce a
raster with a value of 1 rather than just a number very
close to one. </div>
<div> </div>
<div>Does anyone have any suggestions of where I might be
going wrong and/or how to solve this issue?</div>
<div> </div>
<div>On a related note, is it possible to use the Rasterize
tool to work out the average or total values for all the
points which fall in each grid cell? If so, how (I can’t
find anything in the gdal instructions themselves which
would suggest this is possible, but I might be missing
something). If this isn’t possible to do with the Rasterize
tool, are there other tools in QGIS which can do this?</div>
<div> </div>
<div>Thanks for any help anyone can give on this.</div>
<div> </div>
<div>All the best,</div>
<div> </div>
<div>Colin</div>
<div> </div>
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