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Re: VELOVECT Procedure [message #94128 is a reply to message #94127]

Sun, 22 January 2017 09:33

Jim Pendleton
Messages: 165
Registered: November 2011

Senior Member

On Sunday, January 22, 2017 at 12:23:53 AM UTC-7, AGW wrote:
> On Friday, January 20, 2017 at 6:06:32 PM UTC+2, AGW wrote:
>> I have image as two dimensional array as
>> ..............................................
>> IDL> help,b_az
>> B_AZ FLOAT = Array[500, 1000]
>> .............................................
>> I want to use VELOVECT Procedure to draw arrows of values of B_az on this image. when i use this command as
>>
>> VELOVECT, B_az,B_az,/overplot
>>
>> appear whit rectangular on this image !!!!
>>
>> How can I draw arrows of values of B_az on this image correctly?
>
> any help

How did you display your image in order to overplot the vectors? Did you establish your image display's data coordinate system or just use TV or the equivalent? Velovect when using OVERPLOT expects a data coordinate space to have been established first. That is, it needs to know where the origin of the image is in the window, and the scaling between pixels and data space.

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[Message index]

		VELOVECT Procedure By: Ali Gamal on Fri, 20 January 2017 08:06
		Re: VELOVECT Procedure By: Ali Gamal on Fri, 20 January 2017 08:20
		Re: VELOVECT Procedure By: Matthew Argall on Fri, 20 January 2017 10:27
		Re: VELOVECT Procedure By: Ali Gamal on Fri, 20 January 2017 08:22
		Re: VELOVECT Procedure By: Ali Gamal on Sat, 21 January 2017 04:09
		Re: VELOVECT Procedure By: Ali Gamal on Sat, 21 January 2017 23:23
		Re: VELOVECT Procedure By: Jim Pendleton on Sun, 22 January 2017 09:33

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