| Re: Refine a vector layer in ENVI [message #49043] |
Thu, 15 June 2006 13:00  |
cpadwick
Messages: 4
Registered: June 2006
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Junior Member |
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Hi Jenny,
I just tried a test with ENVI 4.2 and was not able to repeat the
behavior you described. Here's what I tried:
-open bhtmref.img in the default data directory
-display it
-click Overlay->Vectors. Vector parameters comes up
-click File->Create New Layer. Choose layer name and output file,
click ok.
-Available Vectors List comes up. Load the new layer into the display.
-in the Vector Parameters Dialog, click Mode->Add New Vectors
-draw some polygons on the screen and save them
-Click Mode->Edit Existing Vectors
-select a vector and move its nodes around. When finished right
click->Accept Changes
The nodes stay where I placed them, and I don't notice any movement
like you described. What version of ENVI are you working with?
Chris
Jenny wrote:
> I've come across the following problems several times, and I'm
> wondering if somebody know a way to fix it. I have shapefiles of lakes
> in a region, which was produced about 40 years ago. When I overlay the
> lake shapefiles to a recent Landsat image, the shapefiles do not
> outline the lakes exactly for the area of the lakes have changed over
> the years. So I want to edit the vector layer to make it fit the
> outline of the lakes in my Landsat image. This doesn't seem to be
> difficult using the Vector Parameters dialog in ENVI (Mode/Edit
> existing vectors). However, when I drag the nodes to move them in the
> desired location in the right side of the vector layer, the whole
> vector (or the left side of it) moves too! When I fixed all the
> problems in the right side and saved it to the layer, and start
> editting the left side, the right side of the vector layer moves again
> with each editting. Thus I can never make it fix a whole lake.
>
> Does anybody have similar experience? Or is this a bug?
>
> Thanks,
> Jenny
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