spidru/jgribx

Java GRIB-1/GRIB-2 decoder

jgribx's Issues

How to use this library in my Android App

Hi
I tried to add this library in my android app to read the Grib file.
0.5.0 have to jar files so i download the 0.4 version jar file and add it to my libs folder.
GribFile gribFile = new GribFile("filename.grb"); // typically .grb or .grb2 extension
gives error and there is nothing to import.

How to use this library on my app, Thanks
Binu

Support NOMADS, NOAA, NWS Grid Template Lambert Conformal (Can be Secant, Tangent, Conical, or Bipolar)

Lambert Conformal (Can be Secant, Tangent, Conical, or Bipolar) is the now the U.S. National standard. It would be quite helpful to be able to decode that grid template.

https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_temp3-30.shtml

Are there any plans to support this format?

Support other data representation templates

Currently this library supports only "Grid Point Data - Complex Packing and Spatial Differencing". It would be useful to support more than this one to enable reading GRIB2 files from e.g. NOMAD which use "Grid Point Data - Simple Packing".

Documentation can be found: https://www.yumpu.com/en/document/view/11723135/guide-to-wmo-table-driven-code-forms

The "Grid Point Data - Simple Packing" is rather simple. "Grid Point Data - Complex Packing" is more complex but as it is a base for the already implemented "Grid Point Data - Complex Packing and Spatial Differencing" this should also be feasable.

NoValidGribException: No valid GRIB records found.

Hello.
I currently pull my grib2 data from https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/MT.gfs_CY.00/RD.20220705/PT.grid_DF.gr2/. When I put this data into a GribFile, I get the NoValidGribException. I am using the current version of the JGribX.jar. After downloading one of these records from this url, I also checked using java -jar JGribX.jar -i grib2.grb and I get the same NoValidGribException. Can you please tell me what is wrong with this data?

Thank you.

NPE on getValue when record is constant

Exception in thread "main" java.lang.NullPointerException
at mt.edu.um.cf2.jgribx.grib1.Grib1RecordBDS.getValue(Grib1RecordBDS.java:276)
at mt.edu.um.cf2.jgribx.grib1.Grib1Record.getValue(Grib1Record.java:296)

Build's tests failed and code does not work, both due to NoValidGribException on valid GRIB2 files

Hi.

I downloaded the actual source code (commit 0e5b8c3 and try to build it with gradle on Intellij. When doing it, all two thirdof the tests failed due to NoValidGribException. Here is the compilation output on Intellij console :

15:52:50: Executing task 'build'...

:compileJava UP-TO-DATE
:processResources UP-TO-DATE
:classes UP-TO-DATE
:jar UP-TO-DATE
:assemble UP-TO-DATE
:compileTestJava UP-TO-DATE
:processTestResources UP-TO-DATE
:testClasses UP-TO-DATE
:test

mt.edu.um.cf2.jgribx.GribTest > testVersion STARTED

mt.edu.um.cf2.jgribx.GribTest > testVersion PASSED

mt.edu.um.cf2.jgribx.GribTest > testGrib1Gfs3 STARTED

mt.edu.um.cf2.jgribx.GribTest > testGrib1Gfs3 FAILED
    mt.edu.um.cf2.jgribx.NoValidGribException at GribTest.java:58

mt.edu.um.cf2.jgribx.GribTest > testGrib2Gfs3 STARTED

mt.edu.um.cf2.jgribx.GribTest > testGrib2Gfs3 FAILED
    mt.edu.um.cf2.jgribx.NoValidGribException at GribTest.java:163

3 tests completed, 2 failed
:test FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':test'.
> There were failing tests. See the report at: file:///C:/Users/amerat/Downloads/JGribX-master/JGribX-master/build/reports/tests/test/index.html

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

* Get more help at https://help.gradle.org

BUILD FAILED in 2s
6 actionable tasks: 1 executed, 5 up-to-date
15:52:54: Task execution finished 'build'.

I thought it was due to corrupted GRIB files in your repository, but when I try with my own and with the JAR I built from the actual code (not your release), it fails too giving me this error :

mt.edu.um.cf2.jgribx.NoValidGribException: No valid GRIB records found.
	at mt.edu.um.cf2.jgribx.GribFile.<init>(GribFile.java:138)
	at mt.edu.um.cf2.jgribx.GribFile.<init>(GribFile.java:80)
	at mt.edu.um.cf2.jgribx.GribFile.<init>(GribFile.java:63)

The GRIB2 file I use is not corrupted, I can open it in Nasa's Panoply GUI Software without any error. Reading your GribFile.java:138, it looks like the code is seeing an empty record whereas it is not.

In my GRIB2 file, there's only one data Temperature_height_above_ground at only one timestamp 2021-10-12 14:00+0000 and height 2.00000 m, thus I wrote the code below.

Please note that the GRIB2 data is first acquired by a client API so that's why it's first held by a variable bytes which type is Array[Byte]. Before using your library I write the GRIB2 data to a file and then pass it's path to the GribFile constructor. This part of the code works fine, I can open the created file in Nasa's Panoply.

      import mt.edu.um.cf2.jgribx._
      import java.util.Calendar
      import java.util.GregorianCalendar
      
      val path: String = "mf-data.grb2"
      val file: File = new File(path)
      FileUtils.writeByteArrayToFile(file, bytes)
      
      val gribFile: GribFile = new GribFile(path)
      
      val date: Calendar = new GregorianCalendar(2021, Calendar.OCTOBER, 12, 14, 0, 0)
      val parameter: String = "TMP"
      val ltvid: String = "TGL:2"     // TGL = "specified height level above ground" & 2 = 2 meters
      val lat: Double = 50.7
      val lon: Double = 362.29
      
      val record: GribRecord = gribFile.getRecord(date, parameter, ltvid)
      val value: Double = record.getValue(lat, lon)
      println("Value at (" + lat + ", " + lon + ") : " + value + "\n")

Thanks.

Does not read all records

When I try to read a grab file, I get "Records successfully read: 1 of 195". What does "RecordsSkipped" mean?

getRecord does not work with level without level value

I have GRB1 file with SFC level, but without level value.

• If I search for records with "SFC", it does not find any record, because
  src/main/mt/edu/um/cf2/jgribx/GribFile.java:359 if (matcher.find()) is false
• if I put "SFC:0" it does not find any record because record.getLevelValues()[0] is NaN
• if I put "SFC:", it fails with
  Exception in thread "main" java.lang.NumberFormatException: null at java.lang.Integer.parseInt(Integer.java:542) at java.lang.Integer.parseInt(Integer.java:615) at mt.edu.um.cf2.jgribx.GribFile.getRecord(GribFile.java:364)

NoValidGribException: No valid GRIB records found for RAP and NAM wind data

Hello.
You have recently updated the jgribx.jar to handle the following data: https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/MT.gfs_CY.00/RD.20220705/PT.grid_DF.gr2/.
Now I am having issues with NAM and RAP data:

https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/MT.rap_CY.06/RD.20220725/PT.grid_DF.gr2/ - for RAP and https://tgftp.nws.noaa.gov/SL.us008001/ST.opnl/MT.nam_AR.ak_CY.06/RD.20220725/PT.grid_DF.gr2/ for NAM

For the RD.20220725 above- please update to the current date to see data for that day.

When I put this data into a GribFile, I get the NoValidGribException. I am using the current version of the JGribX.jar. After downloading one of these records from this url, I also checked using java -jar JGribX.jar -i grib2.grb and I get the same NoValidGribException. Can you please tell me what is wrong with this data?

Thank you so much for helping with decoding GFS - hopefully it will not be a big issue for RAP and NAM.
Christine

Submit the jar to mavenrepository or jcenter

Otherwise every use should compile it by himself.

See https://docs.gradle.org/current/userguide/publishing_maven.html
https://maven.apache.org/repository/guide-central-repository-upload.html

Move directory structure to the gradle standard

It means create "java" folder under "main"
Otherwise gradle build creates empty jar

Getting NullPointer while loading GFS grib2 file

I am trying to load an GFS grib2 file with this library. Unfortunately I get a NullPointerException while calling

GribFile gribFile = new GribFile(gribPath);

as following:

java.lang.NullPointerException at mt.edu.um.cf2.jgribx.grib2.Grib2RecordPDS.getLevelCode(Grib2RecordPDS.java:313) at mt.edu.um.cf2.jgribx.grib2.Grib2Record.getLevelCode(Grib2Record.java:121) at mt.edu.um.cf2.jgribx.GribFile.<init>(GribFile.java:127) at mt.edu.um.cf2.jgribx.GribFile.<init>(GribFile.java:80) at mt.edu.um.cf2.jgribx.GribFile.<init>(GribFile.java:63)

I've downloaded various files from NOAA GFS to test the import, but still the same exception.

I would appreciate any help, thanks in advance.

Cant Read this type grib1 files

Hi i cant read this grib file. Can you please check it
https://github.com/spidru/JGribX/files/8329778/global-wind-wave.zip

Here is the grib record output.

GRIB record:
    IS section:
        Grib Edition 1
        length: 209505 bytes
    PDS header:
        center: 0
        subcenter: 0
        table: 255
        grid_id: 255
        time: 22.3.2022  0:0 (dd.mm.yyyy hh:mm) 
        Type: missing
        Description: missing parameter
        Unit: 
        table version: 255
        Level description:
        	parameter id: 1
        	name: ground or water surface
        	description: ground or water surface
        	units: 
        	short descr: SFC
        	increasing up?: true
        	single layer?: true
        	value1: NaN
        	value2: NaN
        dec.scale: 0
        GDS exists
        BMS exists
    GDS section:
        LatLon Grid  (366x367)
        lon: 61.2 to 97.7  (dx 0.1)
        lat: -7.7 to 28.9  (dy 0.1)
    BMS section:
        bitmap length: 134322
    BDS section:
        min/max value: -1.6407833 1.4991093
        ref. value: -1.6407833
        is a constant: false
        bin. scale: -14
        num bits: 16

Update the JAR

Can you please make a new release JAR with new commits since 2019. I need the new improvements made since then.

Thanks

Use getForecastTime() instead of getReferenceTime() in getRecord()