This routine is obsolete and has been replaced with the ROIToClassification task.
Use this procedure to create a classification image from ROIs. Each input ROI represents a class in the output image.
Syntax
ENVI_DOIT, 'ENVI_ROI_TO_IMAGE_DOIT', CLASS_VALUES=array, FID=file ID, [, /IN_MEMORY], OUT_NAME=string [, R_FID=variable], ROI_IDS=value
Keywords
CLASS_VALUES
Set this keyword to specify the values for the output classes. CLASS_VALUES is an array of long integers specifying the class value for the corresponding ROI_IDS. A value of 0 is reserved for the “Unclassified” class.
FID
Use this keyword to specify the file ID associated with the ROIs. FID is used to get the number of samples and number of lines for the output file. This value is returned from the keyword R_FID in the ENVI_OPEN_FILE procedure. FID is a long integer with a value greater than 0. An invalid file ID has a value of -1.
IN_MEMORY (optional)
Set this keyword to specify that output should be stored in memory. If you do not set IN_MEMORY, output will be stored on disk and you must specify OUT_NAME (see below).
OUT_NAME
Use this keyword to specify a string with the output filename for the resulting data. If you set the keyword IN_MEMORY, you do not need to specify OUT_NAME.
R_FID (optional)
ENVI Classic library routines that result in new images also have an R_FID, or “returned FID.” This is simply a named variable containing the file ID to access the processed data. Specifying this keyword saves you the step of opening the new file from disk.
ROI_IDS
Use this keyword to specify the ROI ID to turn into classes. Each ROI takes the class values specified by CLASS_VALUES. A value of 0 is reserved for the “Unclassified” class. ROI_ID is an array of ROI IDS returned from the function ENVI_GET_ROI_IDS.