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Fields for table: INV_LAYER

Field NameCodesData TypeUnitsTest ProtocolDescription
SHRP_ID

VARCHAR2(4)


Test section identification number assigned by LTPP program. Must be combined with STATE_CODE to be unique.
STD_DEV_THICKNESS

NUMBER(5,2)
in

Standard deviation of the thickness measurements.
LAYER_TYPE
LAYER_TYPE_INVVARCHAR2(1)


General layer type designation used to identify inventory data requirements.
RECORD_STATUS

VARCHAR2(1)


A code indicating the general quality of the data.
STATE_CODE
STATE_PROVINCENUMBER(2)


Numerical code for state or province. U.S. codes are consistent with Federal Information Processing Standards.
CONSTRUCTION_NO

NUMBER(2)


Event number used to relate changes in pavement structure with other time dependent data elements. This field is set to 1 when a test section is initially accepted into LTPP and is incremented with each change to the layer structure.
LAYER_NO

NUMBER(2)


Unique sequential number assigned to pavement layers, starting with layer 1 as the deepest layer (subgrade).
DESCRIPTION
DESCRIPTIONNUMBER(2)


Code indicating general type of layer.
MATERIAL_TYPE
MAT_TYPENUMBER(2)


Code indicating the type of material in each layer.
MEAN_THICKNESS

NUMBER(4,1)
in

Mean thickness of each layer. QC applies to GPS, see QC Manual for SPS.
MIN_THICKNESS

NUMBER(4,1)
in

Minimum thickness of each material layer.
MAX_THICKNESS

NUMBER(4,1)
in

Maximum thickness of each material layer.