These data contain Kriging estimates for Cockle and Razor clam densities, lengths, and fresh weights. zip-file contains: data_krige_autumn2011.txt: estimates for the autumn 2011 sampling data_krige_spring2012.txt: estimates for the spring 2012 sampling grid: grid identifier CockleNDensity.pred: cockle numeric density, in cockles/m^2 CockleNDensity.var: variance in cockle numeric density CockleLength.pred: cockle length in mm CockleLength.var: variance in cockle length CockleWeight.pred: cockle fresh weight CockleWeight.var: variance in cockle fresh weight CockleFreshWeightDensity.pred: cockle fresh weight density in g/m^2 CockleFreshWeightDensity.var: variance in cockle fresh weight density EnsisNDensity.pred: ensis numeric density, in individuals/m^2 EnsisNDensity.var: variance in ensis numeric density EnsisLength.pred: ensis length in mm EnsisLength.var: variance in ensis length EnsisFreshWeightDensity.pred: ensis fresh weight density in g/m^2 EnsisFreshWeightDensity.var: variance in ensis fresh weight density SeabedHeight: bathymetric height in cm NAP (Dutch mean sea level) RDX: x-coordinate of the Dutch national grid (Rijksdriehoek-coordinates) RDY: y-coordinate of the Dutch national grid (Rijksdriehoek-coordinates) GridIndex: grid-point identifier CockleAdult.ks: cockle numeric density, estimated using an alternative kernel smoothing method. Can be ignored. EnsisAdult.ks: ensis numeric density, estimated using an alternative kernel smoothing method. Can be ignored. Area: area of the grid point FET: fractional exposure time of this patch (between 0 and 1, 0=always submerged, 1=always exposed) Patch_ID_Quote: alternative grid-point identifier Patch_ID: alternative grid-point indentifier