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Monitor Users
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Python API
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Python API
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Ingest an Unsupported Grid
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Determine Grid Projection
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Create Grid Projection File
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Create Model Definition
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Troubleshooting Grib Ingest
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2018-01-23 11:45:59 -07:00
< a href = "https://github.com/Unidata/awips2/edit/unidata_17.1.1/docs/edex/new-grid.md" title = "Edit this page" class = "md-icon md-content__icon" > edit< / a >
2017-07-07 17:54:00 -07:00
< h1 > Ingest a New Grid< / h1 >
< p > Unrecognized grids can be decoded by EDEX simply by dropping < code > *.grib< / code > or < code > *.grib2< / code > files into < code > /awips2/data_store/ingest/< / code > < / p >
< p > To add support for a new grid, two edits must be made:< / p >
< ul >
< li > < strong > Geospatial projection< / strong > must be defined in a < em > grid navigation file< / em > < / li >
< li > < strong > Grid name< / strong > , < strong > center< / strong > , < strong > subcenter< / strong > , and < strong > process ID< / strong > must be defined in a < em > model definition file< / em > .< / li >
< / ul >
< h2 id = "ingest-an-unsupported-grid" > Ingest an Unsupported Grid< a class = "headerlink" href = "#ingest-an-unsupported-grid" title = "Permanent link" > < / a > < / h2 >
< ol >
< li >
< p > Download an example grib1 file and rename to a < code > *.grib< / code > extension, then copy to the manual ingest point < code > /awips2/data_store/ingest/< / code > < / p >
< pre > < code > wget http://www.unidata.ucar.edu/staff/mjames/14102318_nmm_d01.GrbF00600 -O wrf.grib
cp wrf.grib /awips2/data_store/ingest/
< / code > < / pre >
< p > Remember that the data distribution file (< code > /awips2/edex/data/utility/edex_static/base/distribution/grib.xml< / code > ) will match filename which have the < code > *.grib< / code > extension.< / p >
< / li >
< li >
< p > Confirm that the grib file decodes in the grib log file:< / p >
< pre > < code > edex log grib
INFO [Ingest.GribDecode] /awips2/data_store/ingest/grib/20141026/14/wrf.grib processed in: 0.1200 (sec) Latency: 21.8080 (sec)
INFO [Ingest.GribDecode] /awips2/data_store/ingest/grib/20141026/14/wrf.grib processed in: 0.1180 (sec) Latency: 21.8140 (sec)
INFO [Ingest.GribDecode] /awips2/data_store/ingest/grib/20141026/14/wrf.grib processed in: 0.4230 (sec) Latency: 21.8360 (sec)
INFO [Ingest.GribDecode] /awips2/data_store/ingest/grib/20141026/14/wrf.grib processed in: 0.2240 (sec) Latency: 21.9140 (sec)
...
< / code > < / pre >
< / li >
< li >
< p > Check that the hdf5 data directory exists for our unnamed grid< / p >
< pre > < code > ls -latr /awips2/edex/data/hdf5/grid/GribModel:7:0:89
< / code > < / pre >
< p > Though the grib file has been decoded, it has been given a generic name with its center, subcenter, and process IDs (7, 0, 89, respectively). < / p >
< / li >
< / ol >
< h2 id = "determine-grid-projection" > Determine Grid Projection< a class = "headerlink" href = "#determine-grid-projection" title = "Permanent link" > < / a > < / h2 >
< p > When the grid was ingested a record was added to the < code > grid_coverage< / code > table with its navigation information:< / p >
< pre > < code > psql metadata
metadata=# select nx,ny,dx,dy,majoraxis,minoraxis,la1,lo1,lov,latin1,latin2 from gridcoverage where id=(select distinct(location_id) from grid_info where datasetid='GribModel:7:0:89');
nx | ny | dx | dy | majoraxis | minoraxis | la1 | lo1 | lov | latin1 | latin2
-----+-----+------------------+------------------+-----------+-----------+------------------+-------------------+-------------------+------------------+------------------
201 | 155 | 4.29699993133545 | 4.29699993133545 | 6378160 | 6356775 | 42.2830009460449 | -72.3610000610352 | -67.0770034790039 | 45.3680000305176 | 45.3680000305176
(1 row)
< / code > < / pre >
< p > Compare with the projection info returned by wgrib on the original file:< / p >
< pre > < code > wgrib -V wrf.grib
rec 799:27785754:date 2014102318 ALBDO kpds5=84 kpds6=1 kpds7=0 levels=(0,0) grid=255 sfc 6hr fcst: bitmap: 736 undef
ALBDO=Albedo [%]
timerange 0 P1 6 P2 0 TimeU 1 nx 201 ny 155 GDS grid 3 num_in_ave 0 missing 0
center 7 subcenter 0 process 89 Table 2 scan: WE:SN winds(grid)
Lambert Conf: Lat1 42.283000 Lon1 -72.361000 Lov -67.077000
Latin1 45.368000 Latin2 45.368000 LatSP 0.000000 LonSP 0.000000
North Pole (201 x 155) Dx 4.297000 Dy 4.297000 scan 64 mode 8
min/max data 5 21.9 num bits 8 BDS_Ref 50 DecScale 1 BinScale 0
< / code > < / pre >
< p > Notice that our grib1 file is a < strong > Lambert Conformal< / strong > projection. We will need these values for the next step. Note that < strong > there is a tolerance of +/- 0.1 degrees< / strong > to keep in mind when defining your coverage area.< / p >
< h2 id = "create-grid-projection-file" > Create Grid Projection File< a class = "headerlink" href = "#create-grid-projection-file" title = "Permanent link" > < / a > < / h2 >
< p > Grid projection files are stored in < code > /awips2/edex/data/utility/edex_static/base/grib/grids/< / code > and there are four grid coverage types available:< / p >
< ol >
< li >
< p > < strong > lambertConformalGridCoverage< / strong > example< / p >
< pre > < code > < lambertConformalGridCoverage>
< name> 305< /name>
< description> Regional - CONUS (Lambert Conformal)< /description>
< la1> 16.322< /la1>
< lo1> -125.955< /lo1>
< firstGridPointCorner> LowerLeft< /firstGridPointCorner>
< nx> 151< /nx>
< ny> 113< /ny>
< dx> 40.63525< /dx>
< dy> 40.63525< /dy>
< spacingUnit> km< /spacingUnit>
< minorAxis> 6356775.0< /minorAxis>
< majorAxis> 6378160.0< /majorAxis>
< lov> -95.0< /lov>
< latin1> 25.0< /latin1>
< latin2> 25.0< /latin2>
< /lambertConformalGridCoverage>
< / code > < / pre >
< / li >
< li >
< p > < strong > polarStereoGridCoverage< / strong > example< / p >
< pre > < code > < polarStereoGridCoverage>
< name> 405< /name>
< description> Sea Ice south 690X710 13km grid< /description>
< la1> -36.866< /la1>
< lo1> 139.806< /lo1>
< firstGridPointCorner> LowerLeft< /firstGridPointCorner>
< nx> 690< /nx>
< ny> 710< /ny>
< dx> 12.7< /dx>
< dy> 12.7< /dy>
< spacingUnit> km< /spacingUnit>
< minorAxis> 6371229.0< /minorAxis>
< majorAxis> 6371229.0< /majorAxis>
< lov> 100.0< /lov>
< /polarStereoGridCoverage>
< / code > < / pre >
< / li >
< li >
< p > < strong > latLonGridCoverage< / strong > example< / p >
< pre > < code > < latLonGridCoverage>
< name> 864162002< /name>
< description> UKMet HiRes combined - Southern Hemisphere
Longitude range 71.25E - 70.416E < /description>
< la1> -89.721< /la1>
< lo1> 71.25< /lo1>
< firstGridPointCorner> LowerLeft< /firstGridPointCorner>
< nx> 864< /nx>
< ny> 162< /ny>
< dx> 0.833< /dx>
< dy> 0.556< /dy>
< spacingUnit> degree< /spacingUnit>
< la2> -0.278< /la2>
< lo2> 70.416< /lo2>
< /latLonGridCoverage>
< / code > < / pre >
< / li >
< li >
< p > < strong > mercatorGridCoverage< / strong > example< / p >
< pre > < code > < mercatorGridCoverage>
< name> NBM_PR< /name>
< description> National Blend Grid over Puerto Rico - (1.25 km)< /description>
< la1> 16.9775< /la1>
< lo1> -68.0278< /lo1>
< firstGridPointCorner> LowerLeft< /firstGridPointCorner>
< nx> 339< /nx>
< ny> 225< /ny>
< dx> 1.25< /dx>
< dy> 1.25< /dy>
< la2> 19.3750032477232< /la2>
< lo2> -63.984399999999994< /lo2>
< latin> 20< /latin>
< spacingUnit> km< /spacingUnit>
< minorAxis> 6371200< /minorAxis>
< majorAxis> 6371200< /majorAxis>
< /mercatorGridCoverage>
< / code > < / pre >
< / li >
< / ol >
< p > Copy an existing file file with the same grid projection type (in this case < strong > lambertConformalGridCoverage< / strong > ) to a new file < code > wrf.xml< / code > < / p >
< pre > < code > cd /awips2/edex/data/utility/edex_static/base/grib/grids/
cp RUCIcing.xml wrf.xml
< / code > < / pre >
< p > And edit the new < code > wrf.xml< / code > to define the projection values (example provided):< / p >
< pre > < code > vi wrf.xml
< lambertConformalGridCoverage>
< name> 201155< /name>
< description> Regional - CONUS (Lambert Conformal)< /description>
< la1> 42.2830009460449< /la1>
< lo1> -72.3610000610352< /lo1>
< firstGridPointCorner> LowerLeft< /firstGridPointCorner>
< nx> 201< /nx>
< ny> 155< /ny>
< dx> 4.29699993133545< /dx>
< dy> 4.29699993133545< /dy>
< spacingUnit> km< /spacingUnit>
< minorAxis> 6356775.0< /minorAxis>
< majorAxis> 6378160.0< /majorAxis>
< lov> -67.0770034790039< /lov>
< latin1> 45.3680000305176< /latin1>
< latin2> 45.3680000305176< /latin2>
< /lambertConformalGridCoverage>
< / code > < / pre >
< blockquote >
< p > Notice < code > < name> 201155< /name> < / code > defined from the number of grid points (201 x 155). This value will be matched against an entry in our models file (below) to set the name of the model (e.g. WRF).< / p >
< / blockquote >
< h2 id = "create-model-definition" > Create Model Definition< a class = "headerlink" href = "#create-model-definition" title = "Permanent link" > < / a > < / h2 >
< p > Model definition XML files are found in < strong > /awips2/edex/data/utility/edex_static/base/grid/models/< / strong > . Since our grib1 file has a center ID of 7 (NCEP) we will edit the < strong > gribModels_NCEP-7.xml< / strong > file.< / p >
< pre > < code > cd /awips2/edex/data/utility/edex_static/base/grib/models/
vi gribModels_NCEP-7.xml
< / code > < / pre >
< p > in < code > < gribModelSet> < / code > add an entry< / p >
< pre > < code > < model>
< name> WRF< /name>
< center> 7< /center>
< subcenter> 0< /subcenter>
< grid> 201155< /grid>
< process>
< id> 89< /id>
< /process>
< /model>
< / code > < / pre >
< p > save the file and restart EDEX for the changes to take effect.< / p >
< pre > < code > sudo service edex_camel restart
< / code > < / pre >
< p > Now copy the < code > wrf.grib< / code > file < em > again< / em > to < strong > /awips2/data_store/ingest/< / strong > . If everything is correct we will not see any persistence errors since the grid is now named < strong > WRF< / strong > and not < strong > GribModel:7:0:89< / strong > .< / p >
< pre > < code > cp wrd.grib /awips2/data_store/ingest/
edex log grib
< / code > < / pre >
< p > After you have confirmed that the grid was ingested with the given name, you can < a href = "../../cave/d2d-edit-menus.html" > edit the D2D product menus to display the new grid< / a > .< / p >
< h2 id = "troubleshooting-grib-ingest" > Troubleshooting Grib Ingest< a class = "headerlink" href = "#troubleshooting-grib-ingest" title = "Permanent link" > < / a > < / h2 >
< p > If you ingest a piece of data and the parameter appears as unknown in the metadata database, ensure that the correct parameter tables are in place for the center/subcenter.< / p >
< p > Make sure the latitude and longitude entries in your coverage specification file match those of your ingested raw grib file. There is a tolerance of +/- 0.1 degree to keep in mind when defining your coverage area.< / p >
< p > If some of the information is unknown, using a grib utility application such as < em > wgrib< / em > and < em > wgrib2< / em > (not delivered) can be useful in determining the information that must be added to correctly process a new grib file.< / p >
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