[GRASS-user] question on i.nightlights.intercalibration code

[Gabriel Cotlier]

Dear Nikos and Veronica,

Thanks a lot for your emails, I'm happy it worked!

I will try to avoid of the extent message  "360 degree EW extent is
exceeded by 0.999827 cells" using:  g.region -a, should I enter this
command before importing the images - raster data layers ?

Thanks a lot again for your guidance.

Gabriel


On Fri, Jun 22, 2018 at 12:50 AM, Nikos Alexandris <nik at nikosalexandris.net>
wrote:

> * Gabriel Cotlier <gabiklm01 at gmail.com> [2018-06-21 18:24:38 -0300]:
>
> Hello Veronica,
>>
>> Thanks a lot it worked!!
>>
>
> Dear Gabriel,
>
> Thanks for posting details and great it works. Don't worry about the
> last image, there are no coefficients for F18 and 2013. We are forced
> to skip this image in any analysis.
>
>
> Details
>
> Veronica is right, and I am ignorant for so many things when it comes to
> Windows.
>
> In Linux, one may use the syntax `some_command` or
> $(some_command). It's a smart way to feed-in longer list of items, such
> as map names in GRASS GIS. Note, the former is old-style, so best to use
> the $()
> notation (if of interest, see
> https://unix.stackexchange.com/a/5782/13011).
>
> You might want to re-check the extent you have set, so as to
> get rid of the "360 degree EW extent is exceeded by 0.999827 cells"
> messages (?). Depending on how you have set your region, maybe the `-a`
> option for `g.region` would help (?).
>
> The last failing image is not a computational error. The error
> message
> --%<---
>
>> ValueError: The selected model does not know about this
>> combination of Satellite + Year!
>>
> --->%--
> means that there are no coefficients for satellite "F18" and for the
> year 2013. You may read this in
> https://trac.osgeo.org/grass/browser/grass-addons/grass7/ima
> gery/i.nightlights.intercalibration/intercalibration_coefficients.py#L99
> and the referenced papers, of course.
>
> For various reasons, I did not improve the script in
> handling this situations. I just let it emit an error message. I hardly
> remember having modified this message to say something like "There are
> given coefficients for satellite F?? and Year ????". But I can't trace
> anything in my local repository.
>
> (
> Note, there are many newer algorithms. It would be obviously great to
> integrate some of them in the existing module. If a new model bases upon
> a similar math formula, then it's only necessary to add:
>
> 1. a new set of coefficients in https://trac.osgeo.org/grass/b
> rowser/grass-addons/grass7/imagery/i.nightlights.intercalibr
> ation/intercalibration_coefficients.py#L38
>
> 2. a new equation in https://trac.osgeo.org/grass/b
> rowser/grass-addons/grass7/imagery/i.nightlights.intercalibr
> ation/intercalibration_equations.py#L15
>
> 3. a new subclass, for the new model, in https://trac.osgeo.org/grass/b
> rowser/grass-addons/grass7/imagery/i.nightlights.intercalibr
> ation/intercalibration_models.py
>
> Maybe more work if there is a substantially different math logic.
> )
>
> Thanks, Nikos
>
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