SSEC forums

Posted: **Wed Feb 22, 2012 4:04 pm**

Hi all,

Is the orbit # available anywhere in the standard ADL data structures for a VIIRS input RDR? I am not seeing it in the Verified RDR.

Posted: **Wed Feb 22, 2012 4:40 pm**

I believe the BeginningOrbitNumber metadata in the .asc file is what you're looking for. I see it on a VIIRS-SCIENCE-RDR. From there it's copied to different output items as they're created.

Posted: **Thu Feb 23, 2012 6:22 am**

Where in the internal data structures is that metadata item stored? We're looking at updates to the F LUT and calibration code and might need that information in the code updates.

Posted: **Thu Feb 23, 2012 2:42 pm**

At a high level, the steps are this:
1. Get a pointer to a particular input data item that you know has the metadata
2. Get the input item's metadata collection
3. Get the metadata collection's metadata item for BeginningOrbitNumber
4. Get the value of that metadata item.

I added the below code to the top of ProSdrViirsCal::doProcessing() and it printed the BeginningOrbitNumber value.

Code: Select all

     1    // Get a data item pointer
     2    ProCmnDataItem* itemPtr = getInputItem(VIIRS_RDR_VERIFIED);
     3
     4    if(itemPtr != 0)
     5    {
     6       UInt32 beginningOrbitvalue = 0;
     7
     8       DmCoreItemAbs* mdItemPtr = 0;
     9       DmCoreMetadataCollection* mdCollectionPtr = 0;
    10
    11       // Get the data item's metadata pointer
    12       mdCollectionPtr = itemPtr->getMetadata();
    13
    14       if(mdCollectionPtr != 0)
    15       {
    16          // Get the beginning orbit number metadata item from the collection
    17          mdItemPtr = mdCollectionPtr->findMetadata(
    18                DmCoreItemAbs::UINTEGER,
    19                BEGINNINGORBITNUMBER.c_str());
    20
    21          if(mdItemPtr != 0)
    22          {
    23             // Get the value from the metadata item
    24             beginningOrbitvalue =
    25                static_cast<DmCoreItemUInteger*>(mdItemPtr)->getValue();
    26
    27             std::cout << "beginningOrbitvalue is "
    28                << beginningOrbitvalue
    29                << std::endl;
    30          }
    31       }
    32    }
    33    else
    34    {
    35          std::cout << "Unable to get input item" << std::endl;
    36    }

Line 2 gets a pointer to an input data item that is already an input to this algorithm. VIIRS_RDR_VERIFIED is a string constant for the group name (not CollectionShortName) of the item. So in this example from ProSdrViirsVerifiedRdr_CFG.xml

Code: Select all

         <group name="VIIRS-SCIENCE-RDR-Verified">
               <config>
                   <name>DataEndianType</name>
                   <configValue>Both</configValue>
               </config>
               <config>
                  <name>OfficialShortName</name>
                  <configValue>VIIRS-SCIENCE-RDR-Verified</configValue>
               </config>
               <config>
                  <name>OutputType</name>
                  <!--                                          -->
                  <!-- Note changing this from heap will output -->
                  <!-- it with a dataset type tag which is not  -->
                  <!-- supported in the DPIS                    -->
                  <!--                                          -->
                  <configValue>HEAP</configValue>
               </config>
         </group>

It's the value from <group name="VIIRS-SCIENCE-RDR-Verified"> that should be used. (Though in this case it's the same as the collection short name). That string constant is from $ADL_HOME/CMN/PROStrings/src/ProCmnShortNames.cpp. ProCmnShortNames.cpp is a poorly named file because it actually contains group name values, not short name values.

Each ProCmDataItem contains a metadata collection of type DmCoreMetadataCollection*. So on line 12 we get that collection.

Each DmCoreMetadataCollection contains one or more items with a base class of DmCoreItemAbs ("Abs" is for Abstract). On line 17-19, we try to find a metadata item of type DmCoreItemAbs::UINTEGER (defined $ADL_HOME/CMN/Utilities/DMS/include/DmCoreItemAbs.h) and a name of BEGINNINGORBITNUMBER (defined in $ADL_HOME/CMN/PROStrings/src/ProCmnMetadata.cpp). The easiest way to determine the type and name is to look at a .asc file:

Code: Select all

("BeginningOrbitNumber" UINTEGER EQ 14)

Once we have the individual metadata item, (from line 17), we need to cast it from its base type of DmCoreItemAbs* to a DmCoreItemUInteger* so that getValue() can return the proper type.

SSEC forums

Orbit number

Orbit number

Re: Orbit number

Re: Orbit number

Re: Orbit number