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Re: Remote Sensing C

Posted: May 12th, 2011, 11:46 am
by winneratlife
If a satellite-based pushbroom sensor has a row of 9,000 CCD cells aligned perpendicular to the satellite's motion, and the swath width is 270 kilometers, what is the ground sampling distance (spatial resolution) in meters?
And I just realized how to do this question *facepalm* so I'll explain it if anyone needs me too.
If you imagine the pushbroom, you have 9000 cells lined up. Width is 270000 meters.
Each cell encompasses 30 meters.

Re: Remote Sensing C

Posted: May 12th, 2011, 2:00 pm
by The Eviscerator
The answer to the first question is 30m. It is that simple.

Now as for the second question, you are not even close haverstall. I'll give you some more time to think about it and try it again until I post the answer on the answer key.

We got 6th at our state competition, but we only lost to first by 6 points, and we made a bunch of stupid mistakes, so we could've easily gotten first. Hence the repetitive facedesk.

Re: Remote Sensing C

Posted: May 12th, 2011, 9:05 pm
by haverstall
Ok, so was looking at this question again, and realized that maybe instead of times, it's talking about minutes and seconds as in degrees. So is the answer 60 minutes?

Re: Remote Sensing C

Posted: May 12th, 2011, 9:13 pm
by The Eviscerator
Actually, haverstall, I looked at what you did the first time, and you did everything right, but you accidentally used the Earth's radius instead of diameter, so you were off by a lot. The answer is 40 seconds.

Re: Remote Sensing C

Posted: May 12th, 2011, 9:37 pm
by haverstall
fffffffffffffff....i'm feeling like the dumbest person on this planet.

yup, it's 0.67 minutes or 40 seconds. Good to know I had the right process.

Re: Remote Sensing C

Posted: May 22nd, 2011, 2:41 pm
by haverstall
So..nats test....

Did anyone study ASTER or ALI before? We had basic info on ASTER, but nothing on ALI.

Re: Remote Sensing C

Posted: May 23rd, 2011, 10:42 am
by The Eviscerator
Yeah... We knew ASTER, but knew nothing about ALI and AVIRUS. That completely screwed us over and made us not medal. We got 8th :(

Congrats on 6th place haverstall......................................

Re: Remote Sensing C

Posted: May 23rd, 2011, 1:49 pm
by haverstall
Thanks.

Btw, I should probably thank you for providing those two questions. If you hadn't, I probably wouldn't have answered those questions on the test.

I also need to figure out spatial resolution, or just resolution in general. Those questions stumped me.

Re: Remote Sensing C

Posted: May 23rd, 2011, 5:10 pm
by The Eviscerator
No problem... gaahhhh, this was the first time in 3 years or something that my school didn't medal in Remote Sensing at nationals... I'm such a failure :cry:

Re: Remote Sensing C

Posted: May 23rd, 2011, 5:13 pm
by zyzzyva980
Heya, top 10 at nats, nothing to be ashamed of. There are plenty of worthy competitors who didn't make it. Be glad you got there.