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Orthorectifying Quickbird scenes with RPC files [message #67037]

Thu, 25 June 2009 04:46

Muhammad
Messages: 2
Registered: June 2009

Junior Member

Hi All:
How can I orthorectify Quicbird scenes with only .rpb files provided
uding ENVI. Quickbird scene is in geotiff format.
Regards,

Arshad

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Re: OR [message #70728 is a reply to message #67037]

Mon, 03 May 2010 16:06

jeanh
Messages: 79
Registered: November 2009

Member

On 03/05/2010 5:55 PM, fgg wrote:
> Hello there,
>
> How can I summarize these two lines in just one line of code?
>
> if (line[0] eq 'i_rng_wf' and n_elements(line) ne 4002) then message,
> $
> 'The # of samples per shot is not valid.'
> if (line[0] eq 'i_rng_wf' and n_elements(line) ne 10882) then message,
> $
> 'The # of samples per shot is not valid.'
>
> ...I thought using OR would do the trick, but I guess I'm missing
> something here:
>
> if (line[0] eq 'i_rng_wf' and n_elements(line) ne (4002 or 10882))
> then message, ...
>
> Thanks

Don't you want to use "and" here (on top of what Mike Galloy said to
have the "or" working)?
If n_elements(line) IS 4002, the the other condition (10882) will be
caught!... in other words, you will always have your error message.
a = 8
if (a ne 1 or a ne 8) then print, "error" ===>error
if (a ne 1 and a ne 8) then print ,"error" ===> nothing.

a=100
if (a ne 1 or a ne 8) then print, "error" ===>error
if (a ne 1 and a ne 8) then print ,"error" ===> error.

Jean

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Re: OR [message #70730 is a reply to message #67037]

Mon, 03 May 2010 15:04

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On 5/3/10 3:55 PM, fgg wrote:
> Hello there,
>
> How can I summarize these two lines in just one line of code?
>
> if (line[0] eq 'i_rng_wf' and n_elements(line) ne 4002) then message,
> $
> 'The # of samples per shot is not valid.'
> if (line[0] eq 'i_rng_wf' and n_elements(line) ne 10882) then message,
> $
> 'The # of samples per shot is not valid.'
>
> ...I thought using OR would do the trick, but I guess I'm missing
> something here:
>
> if (line[0] eq 'i_rng_wf' and n_elements(line) ne (4002 or 10882))
> then message, ...
>
> Thanks

Using the bitwise operators, it would be:

if (line[0] eq 'i_rng_wf' and (n_elements(line) ne 4002 or
n_elements(line) ne 10882) then ...

I would consider using logical operators if you only have to be IDL 6.0+
compatible:

if (line[0] eq 'i_rng_wf' && (n_elements(line) ne 4002 ||
n_elements(line) ne 10882) then ...

The logical operators will short-circuit.

-Mike
--
www.michaelgalloy.com
Research Mathematician
Tech-X Corporation

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