units for spatial range in stvariogram gstat

Dear All,
I have question concerning the unit of measurement for the range
parameter in the fit.stvariogram in gstat, i have fitted the following
spatio temporal variogram for data on monthly averages pf pm10 and the
longitude and latitude are in decimel format
 

pm10_sp

SpatialPoints:
     longitude latitude
1     30.92500 29.95300
61    31.36000 30.26000
121   31.33300 29.84720
 and this is the commands for fitting the variogram

varpm10 <- variogramST(lnpm10only~1,data=lnpm10_stfdf,cutoff=0.8,assumeRegular=T,na.omit=T)
plot(varpm10,map=F)
sumMetric <- vgmST("sumMetric", space = vgm(psill=5,"Mat", range=50, nugget=0),time = vgm(psill=500,"Mat", range=50, nugget=0,kappa=0.3), joint = vgm(psill=10,"Mat", range=100, nugget=1), stAni=200)
sumMetric_Vgm <- fit.StVariogram(varpm10, sumMetric, method="L-BFGS-B",lower=pars.l,upper=pars.u)
plot(varpm10,sumMetric_Vgm,map=F)

extractPar(sumMetric_Vgm)

      sill.s      range.s     nugget.s       sill.t      range.t    
nugget.t
  1.73598444  50.63845035   0.03212857   0.01570379  49.99811448  
0.00000000
     sill.st <http://sill.st>     range.st <http://range.st>   
nugget.st <http://nugget.st>         anis
  0.00000000 100.00004052   0.09151787 200.00000000
 
-- 
now i want to know the units for these parameters in order to be able to
interpret it for example is it in km or m.
 
I really appreciate any help that I deeply need
 
Best Regards
Sara

	Faculty of Economics & Political Science
Cairo University


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