IEnumLasPoint.NextAttrDbl Method

Populates arrays of WKSPointZs and attributes, and optional arrays of 0-based file indices and 1-based point IDs.

[Visual Basic .NET]
Public Sub NextAttrDbl ( _
    ByVal arraySize As Integer, _
    ByRef pPointCount As Integer, _
    ByRef pPoints As WKSPointZ, _
    ByRef pAttribute As Double, _
    ByVal pIntensity As ILongArray, _
    ByVal pFileIndices As ILongArray, _
    ByVal pPointIDs As IDoubleArray _
)

[C#]
public void NextAttrDbl (
    int arraySize,
    ref int pPointCount,
    ref WKSPointZ pPoints,
    ref double pAttribute,
    ref ILongArray pIntensity,
    ref ILongArray pFileIndices,
    ref IDoubleArray pPointIDs
);

[C++]
HRESULT NextAttrDbl(
  long arraySize,
  long* pPointCount,
  _WKSPointZ* pPoints,
  double* pAttribute,
  ILongArray* pIntensity,
  ILongArray* pFileIndices,
  IDoubleArray* pPointIDs
);

[C++]
Parameters
arraySize [in]
  arraySize is a parameter of type long
pPointCount [out]
  pPointCount is a parameter of type long
pPoints [out]
  pPoints is a parameter of type _WKSPointZ
pAttribute [out]
  pAttribute is a parameter of type double
pIntensity 
  pIntensity is a parameter of type ILongArray
pFileIndices 
  pFileIndices is a parameter of type ILongArray
pPointIDs 
  pPointIDs is a parameter of type IDoubleArray

Product Availability

Description

Retrieves points and desired attributes as double values from a LAS dataset. Intended to be called in a loop.

arraySize is the allocated size of the array into which points will be retrieved. This tells the enumerator how many points it can retrieve for each call to Next.

pPointCount is a result, set by the call to Next, and represents the number of points retrieved into the point array. The value will be <= arraySize. When it's 0 there are no more points to retrieve.

pPoints is an array of WKSPointZ. Points are retrieved into it. It must be pre-allocated. It's size must be at least as large as arraySize.

pAttribute is an array of the specified attributes as double values.

pIntensity is an array into which lidar intensity values are placed for the retrieved points. The LongArray object needs to be instantiated if you want to retrieve intensity. Pre-existing values in the array, if any, will be cleared before new values are loaded. Pass NULL for this parameter if you don't need intensity values.

pFileIndices is an array into which las file index (i.e., ILasDataset.File) values are placed for the retrieved points. This enables you top determine which LAS file each point comes from. The indices start at a base of 0. The passed LongArray object needs to be instantiated if you want to retrieve this information. Pre-existing values in the array, if any, will be cleared before new values are loaded. Pass NULL for this parameter if you don't need the file indices.

pPointIDs is an array into which record numbers for retrieved points are placed. These are LAS file point record numbers and they start at a base of 1. These, used in combination with the file indices, enable you to uniquely identify the source of each point; the LAS file and the record number in that file. The DoubleArray object needs to be instantiated if you want to retrieve this information. Pre-existing values in the array, if any, will be cleared before new values are loaded. Pass NULL for this parameter if you don't need point record numbers.

See Also