| Re: EVF in Lat/Lon projection shifted when overlaying to other images [message #59957] |
Mon, 21 April 2008 10:40  |
Jean H.
Messages: 472
Registered: July 2006
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Senior Member |
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Jenny wrote:
> Hi, I created a polyline vector in Lat/Lon coordinates with
> create_new_evf_file as shown in the example in ENVI. However, when I
> apply this evf to images in other projections (not lat/lon), the
> location shifted.
what is the shift? a few meters? kilometers? thousands km?
Have you used the proper datum in your long/lat? Are you sure the
coordinates are around -52 to -130 (Canada) and not +52 to +130..
Jean
PS: is there a big team at EC working with IDL and Envi??? ... I would
definitely be interested!!!
I'm wondering is it possible to create a vector file
> and apply it to different projected images? I thought it must be
> possible, but don't know why it doesn't work. Can you give me a hint?
> what projection should I use to create the EVF file? or what could be
> the problem?
>
> Thank you in advance,
> Jenny
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| Re: EVF in Lat/Lon projection shifted when overlaying to other images [message #59958 is a reply to message #59957] |
Mon, 21 April 2008 10:54  |
envi35@yahoo.ca
Messages: 48
Registered: March 2005
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Member |
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On Apr 21, 1:22 pm, Jenny <env...@yahoo.ca> wrote:
> Hi, I created a polyline vector in Lat/Lon coordinates with
> create_new_evf_file as shown in the example in ENVI. However, when I
> apply this evf to images in other projections (not lat/lon), the
> location shifted. I'm wondering is it possible to create a vector file
> and apply it to different projected images? I thought it must be
> possible, but don't know why it doesn't work. Can you give me a hint?
> what projection should I use to create the EVF file? or what could be
> the problem?
>
> Thank you in advance,
> Jenny
I just found there is a mistake in the projection of the image I used
for reference! Thanks if you're looking ....
Jenny
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