| Re: Refine a vector layer in ENVI [message #49139 is a reply to message #49049] |
Fri, 16 June 2006 08:37  |
cpadwick
Messages: 4
Registered: June 2006
|
Junior Member |
|
|
I'm wondering if it's something specific to either the shapefile or the
Landsat image. Can you find out the projection info for both files you
are using?
Chris
Jenny wrote:
> Hi Chris,
>
> Thanks for your reply. I'm using ENVI 4.2 too. I just repeated what you
> tried and the vector is fine like you said, the nodes didn't move. I'm
> wondering if it has something to do with my old shapefiles. I'll try
> more and keep you posted.
>
> Regards,
> Jenny
>
> cpadwick@ittvis.com wrote:
>> 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
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
