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Re: Oh what is wrong with WHERE() ? [message #48567 is a reply to message #48562]

Sat, 29 April 2006 09:15

Liberum
Messages: 48
Registered: September 2005

Member

Hi Bob,

This is good point that you make and I have thought about this at great
length before. I have to set the arrays m and p to the equal amount of
255, i.e., no data values so as do a good pixel to pixel comparison
over a period of one month. This means that I will do this m and p
comparison about 355 times for one month. Now m and p varies when it
comes to which pixels are valid and which are not. Some times p has all
255 values and the comparison cannot be done.
Now in the checks that I have placed in the program checks of the the
count for 255 in p is greater than the 255 count in m and sets
nodata_tot to the greater number:
IF count_m GE count_p THEN nodata_tot = nodata_m ELSE nodata_tot =
nodata_p
The results showed that these two amounts were identical:
1443953
1443953
This is what I did to solve the problem your pointing out. Yet is does
not work.
The numbers add up until the last where statement where the one pixel
disappears. This is why I am trying now David's approach and using LONG
instead of DOUBLE. Still a pixel disappears :( I think that it is
something about this array as I tried another and it works. The thing
is what? I can shrink the arrays but I will have to exclude some data.
I did just that with the following check (each arrays should only have
the values 255, 1 or 2):

r = where((p EQ 255.0 OR p EQ 1.0 OR p EQ 2.0), check_p,
COMPLEMENT=compp, NCOMPLEMENT=ncompp)
print, 'check_p: ', check_p
IF ncompp GT 0 THEN stop, p[compp]

Yet this test is passed and ncompp is always zero. If I reduce the
array, then what am I looking for in that case? I am lost.

/Sheldon

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[Message index]

		Re: Oh what is wrong with WHERE() ? By: news.qwest.net on Mon, 01 May 2006 10:02
		Re: Oh what is wrong with WHERE() ? By: Liberum on Sat, 29 April 2006 09:15
		Re: Oh what is wrong with WHERE() ? By: news.qwest.net on Sat, 29 April 2006 08:49
		Re: Oh what is wrong with WHERE() ? By: Liberum on Sat, 29 April 2006 08:35
		Re: Oh what is wrong with WHERE() ? By: David Fanning on Sat, 29 April 2006 08:14
		Re: Oh what is wrong with WHERE() ? By: Liberum on Thu, 04 May 2006 01:18

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