ENVIDeepLearningGeoJSONToROI

This function converts GeoJSON code containing bounding box information to polygon regions of interest (ROIs). Bounding boxes are used in deep learning object detection.

This routine is part of ENVI Deep Learning, which requires a separate license and installation.

Note: The ENVI API provides a task called GeoJSONToROI. That task supports ROIs of all types with spatial references. The ENVIDeepLearningGeoJSONToROI object supports polygon ROIs only with both spatial references and pixel-based coordinates.

Example

Sample data files are available on our ENVI Tutorials web page. Click the "Deep Learning" link in the ENVI Tutorial Data section to download a .zip file containing the data. Extract the contents of the .zip file to a local directory. Files are located in the object_detection folder.

; Start the application

e = ENVI()

; Select an input GeoJSON file. Update the following line

; with the correct path to the tutorial data files.

GeoJSONFile = 'C:\MyTutorialFiles\Handicap_Parking_Spots_BoundingBoxes.json'

inputGeoJSON = JSON_PARSE(GeoJSONFile)

; Convert GeoJSON to ROIs

rois = ENVIDeepLearningGeoJSONToROI(inputGeoJSON)

; Open training raster

File = 'C:\MyTutorialFiles\DRCOG_AerialImage1.dat'

Raster = e.OpenRaster(File)

; Display training raster and ROIs

View = e.GetView()

Layer = View.CreateLayer(Raster)

roiLayers = OBJARR(N_ELEMENTS(rois))

FOR i=0, N_ELEMENTS(rois)-1 DO roiLayers[i] = Layer.AddROI(rois[i])

Syntax

Result = ENVIDeepLearningGeoJSONToROI(InputGeoJSON [, ERROR=value])

Return Value

This function returns a list of one or more ENVIROI objects.

Arguments

InputGeoJSON

Specify an input GeoJSON FeatureCollection of Geometry types that contain bounding box information. See the Bounding Boxes Background topic for details on the specific GeoJSON format that is required.

Methods

None

Properties

None

Keywords

ERROR (optional)

Set this keyword to a named variable that will contain any error message issued during execution of this routine. If no error occurs, the ERROR variable will be set to a null string (''). If an error occurs and the routine is a function, then the function result will be undefined.

When this keyword is not set and an error occurs, ENVI returns to the caller and execution halts. In this case, the error message is contained within !ERROR_STATE and can be caught using IDL's CATCH routine. See IDL Help for more information on !ERROR_STATE and CATCH.

See the Manage Errors topic in ENVI Help for more information on error handling.

Version History

1.2	Introduced