GeoJSONToROI Task

This task converts GeoJSON features to one or more regions of interest (ROIs).

GeoJSON is a geospatial format based on JSON code that is used for encoding geographic data structures. For more information, see the GeoJSON Format Specification. Also see the GeoJSONLint web page for example code and for tools that validate GeoJSON code.

Example

This example creates multiple ROIs from multiple GeoJSON features:

; Start the application

e = ENVI()

; Open a GeoJSON file

File = Filepath('boulder_multiple_features.json', $

Subdir=['data', 'geojson'], $

Root_Dir=e.Root_Dir)

GeoJSON = ENVIGeoJSON(JSON_Parse(File))

; Open an associated raster file

File = Filepath('qb_boulder_msi', Subdir=['data'], $

Root_Dir=e.Root_Dir)

Raster = e.OpenRaster(File)

; Get the task from the catalog of ENVITasks

task = ENVITask('GeoJSONToROI')

; Define task inputs

task.Input_GeoJSON = GeoJSON

; Run the task

task.Execute

; Display the result

view = e.GetView()

layer = view.CreateLayer(Raster)

rois = task.OUTPUT_ROI

roiLayers = OBJARR(N_ELEMENTS(rois))

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

Syntax

Result = ENVITask('GeoJSONToROI')

Input parameters (Set, Get): INPUT_GEOJSON, OUTPUT_ROI_URI

Output parameters (Get only): OUTPUT_ROI

Parameters marked as "Set" are those that you can set to specific values. You can also retrieve their current values any time. Parameters marked as "Get" are those whose values you can retrieve but not set.