>From: Jason Allard <address@hidden> >Organization: PSU >Keywords: 200010240345.e9O3jC425238 McIDAS-X IMGREMAP MAG RES Jason, >While I thought I had a handle on the IMGREMAP and the IMGCOPY commands >before, I'm having a little difficulty. > >As discussed before, I wanted to change the SIZ, RES, and PLA of the >image (originally I was going to also change the projection). Since I >decided not to change the projection, I was going to go with the >IMGCOPY command. It works fine to change the size of the image the the >place that I put the center lat and long... but it didn't appear to >change the resolution. I looked at the IMGCOPY command, and I didn't >see a RES keyword. So you can see what I did, here's the command I >used: > >IMGCOPY BWF/071197VIS.9 TEST/71197VIS.2 LAT=54 108 PLA=ULEFT SIZ=360 370 MAG=1 > RES=8 Right, there is no RES= keyword, so the RES=8 keyword sequence on your command line is ignored. >Everything worked fine, except the resolution (I think it didn't >work)... the new image 'looked' like it had the same resolution of the >original. To test this, I changed the RES=8 in the command to 16, 32, >128, and even 512... and the copied image looks exactly like the >original. Right. >This isn't quite making sense to me, unless you can't change >the resolution with the IMGCOPY command. Right again. >I then tried using the IMGREMAP command, but since I'm not changing the >projection, it would't let me use the RES or SIZ keywords. I got the >message: > >IMGREMAP: Invalid keyword combination... >IMGREMAP: The keywords RES and SIZE are not valid for DEST projection Right. If you are not changing the projection, you have to be remapping into an existing image. >The DEST projection is the default if you don't want to change the >image... since changing the projection might change the values (as >discussed before), I want to use the original projection. OK. >I guess I didn't pick up on this before because I was working with 8 km >resolution GOES 7 imagery... but now that I'm working with the 4km GOES >8 imagery, I want to change it's resolution to 8. Basically, you want to change the magnification. For this, you can use the IMGCOPY command specifying MAG= keyword values. >Short or remapping the GOES 8 into a GOES 7 image, how do I change the >resolution... or is it changed and I'm not realizing it? Use IMGCOPY. To see the resolution of the resultant image, specify the FORM=EXP keyword sequence on the IMGLIST command. >Thanks for the help, >Jason Tom
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