Hi, when i tried to give the field calculator expression in Quantum GIS it is throwing error like "An error occured while evaluating the calculation string"..Please provide me solution. Thanks in advance, Vamshi Hi Wade, one way you could go is with field calculator: 1. create fields for centroidX/centroidY of the grids, calculate geometry for them. 2. create fields for UpperY, LowerY, LeftX, RightX in field calculator you can then calculate each field: UpperY = centroidY + (gridheight*0.5) LowerY = centroidY - (gridheight*0.5) LeftX = centroidX - (gridwidth*0.5) RightX = centroidX + (gridwidth*0.5)
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