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I have a csv data. the X, and Y columns show bottom left corner of each grid. It is supposed to show as grid square, but it shows points. what is the problem? and is there any way I can make cell grids from these points? help me please! Thanks a lot.

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What software are you using? What have you tried? What do you mean by "grid cells"--a raster or a vector layer of polygons? In what sense are these data "supposed" to display as squares: what's your documentation for that? –  whuber Aug 21 '12 at 19:24

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from your question I am assuming that you want to create a raster grid. There are several ways to do this with a spreadsheet, I recommend using QGIS, convert the spreadsheet to a point shapefile: http://qgis.spatialthoughts.com/2012/01/importing-spreadsheets-or-csv-files-to.html To convert the points to raster use the QGIS "convert vector to raster" too mentioned here: How to convert a vector layer to raster? or if you you could consider interpolating the values using the "interpolate" tool

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