| point datasets in ENVI: some potentially useful routines and an ROI problem [message #46196] |
Thu, 03 November 2005 19:59 |
MarioIncandenza
Messages: 231
Registered: February 2005
|
Senior Member |
|
|
Hello IDL comrades,
I've been working up a set of routines to more easily visualize and
analyze sample points in map imagery using ENVI. The routine library,
such as it is, can be found at
ftp://ftp.nrlmry.navy.mil/pub/receive/hyer/envi_point_pro.pr o
The routines in this library perform the following functions:
GIVEN:
- an georeferenced image display in ENVI
- a list of XY data in lat/long
YOU CAN:
- get boundaries of file area or image window area in lat/lon
coords;
- get indices of points overlapping the file area or Image window
area;
- Use direct graphics to display the points on the Image or
Scroll windows;
- Query the file for the values corresponding to the point
locations, and return the output directly into IDL;
***: This is where the problem is-- see below.***
- generate an ROI of the points to manipulate using the ROI tools
in ENVI.
All these functions are fully scriptable, once the display is created
in ENVI, which I guess can also be done with ENVI_DISPLAY_BANDS.
The above FTP address expires quickly (3 days, I think), so if someone
else can host this, it can remain available after this thread has died
down. I look forward to making some major improvements to it, above and
beyond the immediate problem.
Now, on to the problem:
When you create an ROI using ENVI_CREATE_ROI and ENVI_DEFINE_ROI, for
some reason ENVI treats it like a stepchild. It will appear in the ROI
list in ROI Tools, but it will not display, and will return bad numbers
when you use ENVI_GET_ROI_DATA. The workaround I have found is to save
and then restore the ROI, at which point it behaves correctly. But that
workaround, well, it's undesirable, and shouldn't be necessary. Any
ideas about how I can get ENVI to treat my home-made ROIs better?
Looking for help in just the right place,
Edward Hyer.
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
