Perhaps raster calculator can also help you Expression:
(layer>0 and layer <= 1) Gives us 1 when sentence is true and 0 for false, for each cell in "layer". Good luck Carlos 2014-04-10 9:29 GMT-05:00 Micha Silver <[email protected]>: > Using GRASS there are two modules you can consider. First : > v.to.rast in=... out=... type=point use=val value=1 > 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. > > Next: > r.in.xyz in=... out=... method=sum > will create a raster (at the current region settings) where each cell will > have a value = the count of points in that cell. > > HTH, > Micha > > On 04/10/2014 04:20 PM, Colin D. MacLeod wrote: > > Hi All, > > 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. > > Does anyone have any suggestions of where I might be going wrong and/or > how to solve this issue? > > 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? > > Thanks for any help anyone can give on this. > > All the best, > > Colin > > > ================================================================================== > GIS IN ECOLOGY - Providing Training, Advice And Consultancy On The Use Of > GIS In Ecology > > Web: www.GISinEcology.com Email: [email protected] > > Need to ask a question about using GIS? Try the GIS In Ecology Forum: > www.GISinEcology.com/GIS_in_Ecology_forum.htm > > Books From GIS In Ecology Staff: > > An Introduction To Using GIS In Marine Biology; RRP: £44.99 > An Introduction To Using GIS In Marine Biology: Supplementary Workbook One > - Creating Maps Of Species Distribution; RRP: £19:99 > An Introduction To Using GIS In Marine Biology: Supplementary Workbook Two > - Working With Raster Data Layers; RRP: £19.99 > > If you wish to purchase these books, visit: > http://www.gisinecology.com/Book_Shop.htm > > To help the environment, please do not print out this email unless it is > unavoidable. > > ================================================================================== > > > This mail was received via Mail-SeCure System. > > > _______________________________________________ > Qgis-user mailing > [email protected]http://lists.osgeo.org/mailman/listinfo/qgis-user > This mail was received via Mail-SeCure System. > > > > > > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user >
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