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Meanwhile yet another question on a different topic:
Im trying to figure out what the NPOESS data files are doing with "Reference
Types".
Case 1 is a Reference with type = 0 (Object Reference)
long VIIRS-AF-EDR_Aggr(5);
:AggregateBeginningDate = "2003125";
:AggregateBeginningGranuleID = "NPP001212126088";
:AggregateBeginningOrbitNumber = 9; // int
:AggregateBeginningTime = "10109.840960z";
:AggregateCreationDate = "2003125";
:AggregateEndingDate = "2003125";
:AggregateEndingGranuleID = "NPP001212126088";
:AggregateEndingOrbitNumber = 9; // int
:AggregateEndingTime = "101038.325248z";
:_LastModified = "2005-08-29T15:54:58Z";
data:
{2928, 3528, 3800, 4072, 4344}
The 5 values are indeed object references to 5 other datasets in the file. Any
clues on how this is used, or is it an internal structure that should be left
alone?
h5dump is:
DATASET "VIIRS-AF-EDR_Aggr" {
DATATYPE H5T_REFERENCE
DATASPACE SIMPLE { ( 5 ) / ( 5 ) }
ATTRIBUTE "AggregateBeginningDate" {
DATATYPE H5T_STRING {
STRSIZE 7;
STRPAD H5T_STR_NULLTERM;
CSET H5T_CSET_ASCII;
CTYPE H5T_C_S1;
}
DATASPACE SIMPLE { ( 1, 1 ) / ( 1, 1 ) }
}
ATTRIBUTE "AggregateBeginningGranuleID" {
DATATYPE H5T_STRING {
STRSIZE 15;
STRPAD H5T_STR_NULLTERM;
CSET H5T_CSET_ASCII;
CTYPE H5T_C_S1;
}
DATASPACE SIMPLE { ( 1, 1 ) / ( 1, 1 ) }
}
....
Case 2 is a Reference, with type = 1 (Dataset Region Reference).
long VIIRS-AF-EDR_Gran_0(5);
data:
{3299824, 14172636162555905, 8589934592, 3299824, 14172636162555907}
h5dump is
DATASET "VIIRS-AF-EDR_Gran_0" {
DATATYPE H5T_REFERENCE
DATASPACE SIMPLE { ( 5 ) / ( 5 ) }
The docs on this are pretty sketchy, i wonder if i could get an expanded
description of what the Dataset Region Reference structure looks like? Heres
whats there (last page of 1.6.5 doc):
"Dataset region references are stored as a heap-ID which points to the following
information within the file-heap: an offset of the object pointed to, number-type
information (same format as header message), dimensionality information (same format as
header message), sub-set start and end information (i.e. a coordinate location for each),
and field start and end names (i.e. a [pointer to the] string indicating the first field
included and a [pointer to the] string name for the last field)."
specifically:
"an offset of the object pointed to" = object id ?
"number-type information (same format as header message)" datatype message?
"dimensionality information (same format as header message)" = dataspace
message?
and then im even more lost as to what the fields are....
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