CreatePointCloudSubProject Task

This task divides an existing ENVI LiDAR project into a number of subprojects for simultaneous processing by a number of ENVI Services Engine (ESE) workers. The creation of multiple projects for processing by multiple ESE workers is necessary to prevent project corruption due to concurrent access. The spatial division of the input ENVIPointCloud object into new subprojects is controlled by the SUB_RECT property, but the data extents of the subprojects will always be rounded up to the next 32 x 32 meter tile boundary.

Example

The following example code creates four sub-projects that could be used by ESE workers.

; Start the application

e = ENVI(/HEADLESS)

; Open a file

file = FILEPATH('DataSample.las', ROOT_DIR=e.ROOT_DIR, $

  SUBDIRECTORY = ['data','lidar'])

pointcloud = e.OpenPointCloud(file, $

  PROJECT_URI=Filepath('DataSample', /TMP))

dataRange = pointcloud.DATA_RANGE

dataRangeX = dataRange[3] - dataRange[0]

dataRangeY = dataRange[4] - dataRange[1]

dataCenterX = dataRange[0] + (dataRangeX * 0.5)

dataCenterY = dataRange[1] + (dataRangeY * 0.5)

; Create 4 subprojects, each spanning approximately a quarter of the data extents

; Note the actual subproject data extents will be rounded up to the next 32 x 32 meter tile boundary

subProjectDataRange1 = [dataRange[0], dataRange[1], dataCenterX, dataCenterY]

subProjectDataRange2 = [dataCenterX, dataRange[1], dataRange[3], dataCenterY]

subProjectDataRange3 = [dataRange[0], dataCenterY, dataCenterX, dataRange[4]]

subProjectDataRange4 = [dataCenterX, dataCenterY, dataRange[3], dataRange[4]]

subProjectUri1 = 'C:\DataSampleSubset1\DataSampleSubset1.ini'

subProjectUri2 = 'C:\DataSampleSubset2\DataSampleSubset2.ini'

subProjectUri3 = 'C:\DataSampleSubset3\DataSampleSubset3.ini'

subProjectUri4 = 'C:\DataSampleSubset4\DataSampleSubset4.ini'

task = ENVITask('CreatePointCloudSubProject')

task.INPUT_POINT_CLOUD = pointcloud

task.Execute, URI=subProjectUri1, SUB_RECT=subProjectDataRange1, ERROR=error

task.Execute, URI=subProjectUri2, SUB_RECT=subProjectDataRange2, ERROR=error

task.Execute, URI=subProjectUri3, SUB_RECT=subProjectDataRange3, ERROR=error

task.Execute, URI=subProjectUri4, SUB_RECT=subProjectDataRange4, ERROR=error

; only one dataset open at a time

pointcloud.Close

; open each subproject and print the data extents

subProject1 = e.OpenPointCloud(subProjectUri1)

subDataRange1 = subProject1.DATA_RANGE

subProject1.Close

subProject2 = e.OpenPointCloud(subProjectUri2)

subDataRange2 = subProject2.DATA_RANGE

subProject2.Close

subProject3 = e.OpenPointCloud(subProjectUri3)

subDataRange3 = subProject3.DATA_RANGE

subProject3.Close

subProject4 = e.OpenPointCloud(subProjectUri4)

subDataRange4 = subProject4.DATA_RANGE

subProject4.Close

; print data ranges for the subprojects

print, subDataRange1

print, subDataRange2

print, subDataRange3

print, subDataRange4

Syntax

Result = ENVITask('CreatePointCloudSubProject')

Input properties (Set, Get): INPUT_POINT_CLOUD, SUB_RECT, URI

Output properties (Get only): None

Properties marked as "Set" are those that you can set to specific values. You can also retrieve their current values any time.

Methods

This task inherits the following methods from ENVITask:

Properties

This task inherits the following properties from ENVITask:

COMMUTE_ON_DOWNSAMPLE

INPUT_POINT_CLOUD

An ENVIPointCloud object that references the project that the subprojects will be created from.

SUB_RECT

A four-element double-precision array expressing the spatial range of the required subproject. Specify the values in the coordinate system used by the ENVIPointCloud SPATIALREF property. The array is of the form [x1, y1, x2, y2], where:

x1 = the minimum X value to include in the subproject
y1 = the minimum Y value to include in the subproject
x2 = the maximum X value to include in the subproject
y2 = the maximum Y value to include in the subproject

The actual data extents of the created subproject will be rounded up to the next 32 x 32 meter tile boundary.

If the SUB_RECT property is not specified, then the entire data extents of the original point cloud object are used.

URI

A scalar string that is a fully-qualified path and name of the new subproject .ini file.

Version History

ENVI 5.3

Introduced

API Version

4.2