reproject satellite orbit values from irregular grid to regular grid

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I have a ncdf file containing measurements covering a satellite orbit.

The ncdf contains the corresponding latitude / longitude fields but they ar irregularly spaced. I tried rasterizing the values by extracting the lat,lon,z values but on northern and southern latitudes I then end up with great spaces between the points.

I do not have any information on the projection of the inital file.The output should be a global 0.25 degree raster.

f = open.ncdf("METOPA+ASCAT_C_EUMP_20100101100001_16618_eps_o_250_l1.nc") x=get.var.ncdf(f,"longitude") x = as.vector(x)y=get.var.ncdf(f,"latitude")y = as.vector(y)z=get.var.ncdf(f,"node_num")z = as.vector(z)xyz = cbind(x,y,z)# output should have global extent with 0.25 degrees resolutione
 
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