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Hello LISF community! I have just started using LIS, I wanted to run LIS for snow water equivalent and snow cover simulations over Greenland using the Noah MP 3.6 model. After I run LDT for the lis_input generation, i find that the landmask is correctly generated but the landcover has all values of 0/1 over Greenland. I have tried with both USGS and NCEP modified IGBP (20 classes) option. I get the same issue. I have added the ldt.config and ldtlog at the bottom along with some screenshots of landmask, USGS landcover and IGBP NCEP landcover. I would really appreciate if anyone could help provide some info/support on this issue. #%% config entries for USGS: LIS number of nests: 1 # 1 nest supported for now Number of met forcing sources: 1 # Enter number of forcing types LDT diagnostic file: ldtlog # Log-based diagnostic output file LIS domain:Map projection of the LIS domain: latlon Output methodology: "2d gridspace" Noah-MP PBL Height Value: 900. #Land Parameters Create or readin landmask: create #Soil texture map: Soils map projection: latlon #elevation Albedo mapsAlbedo data source: NCEP_Native Snow albedo mapsMax snow albedo data source: NCEP_Native Greenness fraction mapsGreenness data source: NCEP_Native Slope type mapSlope type data source: NCEP_Native Bottom temperature mapBottom temperature data source: ISLSCP1 #------------------------------------------------------ GDAS T126 elevation map: /projects/nrsc04/models/lis_input/lis_param/elevation/25KM/global_orography.t126.grb #%% LDT LOGStart of LDT parameter processinglocal domain:( 1321 541 )
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Hi @jayaisro Thanks for your interest in LIS. I will take a closer look at your ldt.config and ldtlog files later today, but I think I know why you are seeing this behavior. The "LANDCOVER" field in the lis_input field is a layered field, where each layer is the fraction of that grid point that is If you use "ncdump" on the lis_input file, you can see that this field is also dimensioned by the number of landcover types:
where:
You are only looking at the first layer of the "LANDCOVER" field in the plots that you have attached. If you use "ncview" on the lis_input file, you can change the "sfctypes" value from 1 to 20 to see the fractions of Please let us know if you would like further explanation. |
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Hi @jayaisro
Thanks for your interest in LIS.
I will take a closer look at your ldt.config and ldtlog files later today, but I think I know why you are seeing this behavior.
The "LANDCOVER" field in the lis_input field is a layered field, where each layer is the fraction of that grid point that is
that particular landcover classification. The values are not either 0 or 1, but can be any fraction from (and including) 0.0 to 1.0.
If you use "ncdump" on the lis_input file, you can see that this field is also dimensioned by the number of landcover types: