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I'm working in ArcGIS and I have an elevation model of seaside. What I should do is to model an uplift of land, so make a new raster dataset in which will be higher values (for example to make a new dataset where all the values for land, not for sea, will be 1 meter higher). Please, do anybody know how to do that?

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You can use the Con function in the raster calculator:

Con("elevation raster" > 0, "elevation raster" + 1, "elevation raster")

This means if a pixels value is greater than zero, the new value will be pixel + 1, else pixel value stays the same

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