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Table 2. Land cover variables derived from the 19981and cover/use BOR GIS layer. <br />Variable Code Variable Description <br />agdist Distance to agriculture (meters) <br />dedist Distance to development (meters) <br />grdist Distance to grass (meters) <br />owdist Distance to open water (meters) <br />sfdist Distance to shrub/forest (meters) <br />trdist Distance to transportation (meters) <br />wcdist Distance to wetted channel (meters) <br />wgdist Distance to wet grass (meters) <br />wvdist Distance to wet vegetation (meters) <br />agdist_2 Squared distance to agriculture <br />dedist 2 Squared distance to development <br />grdist_2 Squared distance to grass <br />owdist 2 Squared distance to open water <br />sfdist_2 Squared distance to shrub/forest <br />trdist_2 Squared distance to transportation <br />wcdist_2 Squared distance to wetted channel <br />wgdist_2 Squared distance to wet grass <br />wvdist 2 Squared distance to wet vegetation <br />P_AG_25 Proportion of agriculture within 0.25-mile (400-m ) radius circle <br />P_DE_25 Proportion of development within 0.25-mile (400-m ) radius circle <br />P_GR 25 Proportion of grass within 0.25-mile (400-m ) radius circle <br />P_OW_25 Proportion of open water within 0.25-mile (400-m ) radius circle <br />P_SF_25 Proportion of shrub/forest within 0.25-mile (400-m )radius circle <br />P_TR 25 Proportion of transportation within 0.25-mile (400-m ) radius circle <br />P_WC_25 Proportion of wetted channel within 0.25-mile (400-m ) radius circle <br />P_WG_25 Proportion of wet grass within 0.25-mile (400-m ) radius circle <br />P WV 25 Proportion of wet vegetation within 0.25-mile (400-m ) radius circle <br />21