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Re: get lat/lon from modis SIN grid [message #77910]

Tue, 18 October 2011 12:50

Jeremy Bailin
Messages: 618
Registered: April 2008

Senior Member

On 10/18/11 1:39 PM, Brian Wolven wrote:
> I think we all owe him at least a dollar. =)

http://www.idlcoyote.com/store/index.php?act=viewCat&cat Id=4&ccSID285e73f64c04744fc5f33ff68f529742=sqol50okvgg12 slpubb3srp922

-Jeremy.

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Re: get lat/lon from modis SIN grid [message #77913 is a reply to message #77910]

Tue, 18 October 2011 10:39

Brian Wolven
Messages: 94
Registered: May 2011

Member

I think we all owe him at least a dollar. =)

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Re: get lat/lon from modis SIN grid [message #77921 is a reply to message #77913]

Tue, 18 October 2011 07:57

Mark Piper
Messages: 198
Registered: December 2009

Senior Member

On 10/18/2011 7:25 AM, David Fanning wrote:
> Jenny writes:
>
> I think it would be much easier (and less prone to error)
> to simply use the Map_Proj_*** routines, which are designed
> to do this very thing.
>

Aha! I'm doing a set of webinars later this week which demonstrate the
use of the MAP_PROJ_* routines. I'll make the announcement in a separate
post.

David, I owe you a dollar for setting me up so nicely.

mp

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Re: get lat/lon from modis SIN grid [message #77922 is a reply to message #77921]

Tue, 18 October 2011 06:25

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Jenny writes:

> Hi, has anybody implemented the formulas for Coordinate conversion for
> the MODIS sinusoidal projection included in the MODIS Burned Area
> product User Guide appendix2 (on p24)?
> Link to the Guide:
> http://www.fao.org/fileadmin/templates/gfims/docs/MODIS_Burn ed_Area_User_Guide_2.0.pdf
>
> Based on those formulas, one could get lat/lon information from
> column, row, horizontal, and vertical coordinates of the tile for each
> pixel in a tile. It seems to be too easy to be true? I haven't seen
> any post on this. Has any body tried it?

I think it would be much easier (and less prone to error)
to simply use the Map_Proj_*** routines, which are designed
to do this very thing.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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Re: get lat/lon from modis SIN grid [message #78021 is a reply to message #77922]

Thu, 20 October 2011 19:35

envi35@yahoo.ca
Messages: 48
Registered: March 2005

Member

On Oct 18, 9:25 am, David Fanning <n...@dfanning.com> wrote:
> Jenny writes:
>> Hi, has anybody implemented the formulas for Coordinate conversion for
>> the MODIS sinusoidal projection included in the MODIS Burned Area
>> product User Guide appendix2 (on p24)?
>> Link to the Guide:
>> http://www.fao.org/fileadmin/templates/gfims/docs/MODIS_Burn ed_Area_U...
>
>> Based on those formulas, one could get lat/lon information from
>> column, row, horizontal, and vertical coordinates of the tile for each
>> pixel in a tile. It seems to be too easy to be true? I haven't seen
>> any post on this. Has any body tried it?
>
> I think it would be much easier (and less prone to error)
> to simply use the Map_Proj_*** routines, which are designed
> to do this very thing.
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.idlcoyote.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")

Thanks, David. Webpage from Jeremy's link is well said of our
appreciation! http://www.idlcoyote.com/store/index.php?act=viewCat&cat Id=4&ccSID285...

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