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I have employment data which are huge - about 500 data for each category, like agriculture field, fishing field etc. Now I want to categorise this data in to 7 ranges. Suppose <50=1, >50-100=2, etc. for producing an agriculture map of a country by showing these categories as a legend. I don't want to change my main GIS data. I only want to show this data into small categories in Map. How can I do it?

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Are you interested in creating categorical data in a new field based on another field? Perhaps with the field calculator? – Aaron Jan 31 '13 at 1:57

I suppose you want to do this in ArcMap.

Right click -> Properties -> Symbology You will need to select the Classified and finally classify in the way you want.

For more info check the ESRI help file

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If I got you right, you might use grouping techniques in Layer Properties dialog box > Symbology tab > Categories. Here you would specify the classifications (0>50, 50>100 etc) and labels (1,2,3 etc). The legend in the layout view will use the labels you've specified, so you don't have to change anything in the underlying data.

Organizing categories into groups

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