Plot one masked field over seviri IR108

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Thanasis Karagiannidis

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Dec 28, 2021, 5:25:25 AM12/28/21
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Dear all

 

I have the following problem: I want to overlay a masked field (eg seviri WV6.2-IR10.8) on the IR108 field. I attach an older image created with cartopy as an example. I thought that the masking compositor would do the trick, but obviously I do something wrong. So far I have done the following:

in the composites/seviri.yaml

 

  deepconvection:

    compositor: !!python/name:satpy.composites.DifferenceCompositor

    prerequisites:

      - WV_062

      - IR_108

    standard_name: deepconvection

 

  deepconvection_masked:

    compositor: !!python/name:satpy.composites.MaskingCompositor

    conditions:

      - method: less

        value: -4

        transparency: 100

    prerequisites:

      - deepconvection

      - deepconvection

    standard_name: deepconvection_masked

 

  ir108_deepconvection:

    compositor: !!python/name:satpy.composites.GenericCompositor

    prerequisites:

      - grey_ir108_clouds

    compositor: !!python/name:satpy.composites.GenericCompositor

    prerequisites:

      - deepconvection_masked

    standard_name: ir108_deepconvection

 

 

and in enchancement/generic.yaml

 

  deepconvection_masked:

    standard_name: deepconvection_masked

    operations:

      - name: colorize

        method: !!python/name:satpy.enhancements.colorize

        kwargs:

          palettes:

            - {colors: rdylbu, min_value: -4, max_value: 4}

 

  ir108_deepconvection:

    standard_name: ir108_deepconvection

    operations:

      - name: colorize

        method: !!python/name:satpy.enhancements.colorize

        kwargs:

          palettes:

            - {colors: greys, min_value: 253.15, max_value: 303.15}

    operations:

      - name: colorize

        method: !!python/name:satpy.enhancements.colorize

        kwargs:

          palettes:

            - {colors: spectral, min_value: -4, max_value: 4}

 

 

Overall, the masking seems to work well but I have trouble applying the overlay of the two fields. Only one of the two fields (the last one) is plotted. I attach an image as an example.

 

Any help would be appreciated.

 

Sakis

DC1.png
DC2.png

David Hoese

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Dec 30, 2021, 11:26:14 AM12/30/21
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Hi Sakis,

Sorry for the late reply. Most of the maintainers are on holiday this
week. The one thing that stands out immediately is this portion of your
compositor config:

ir108_deepconvection:

compositor: !!python/name:satpy.composites.GenericCompositor

prerequisites:

- grey_ir108_clouds

compositor: !!python/name:satpy.composites.GenericCompositor

prerequisites:

- deepconvection_masked

standard_name: ir108_deepconvection


What are you trying to say here? This looks like one composite
(`ir108_deepconvection`) with two separate compositor definitions (there
should never be more than one compositor or prerequisites entry).

Dave

On 12/28/21 04:17, Thanasis Karagiannidis wrote:
> Dear all
>
> I have the following problem: I want to overlay a masked field (eg
> seviri WV6.2-IR10.8) on the IR108 field. I attach an older image created
> with cartopy as an example. I thought that the masking compositor would
> do the trick, but obviously I do something wrong. So far I have done the
> following:
>
> _in the composites/seviri.yaml_
>
> deepconvection:
>
> compositor: !!python/name:satpy.composites.DifferenceCompositor
>
> prerequisites:
>
> - WV_062
>
> - IR_108
>
> standard_name: deepconvection
>
> deepconvection_masked:
>
> compositor: !!python/name:satpy.composites.MaskingCompositor
>
> conditions:
>
> - method: less
>
> value: -4
>
> transparency: 100
>
> prerequisites:
>
> - deepconvection
>
> - deepconvection
>
> standard_name: deepconvection_masked
>
> ir108_deepconvection:
>
> compositor: !!python/name:satpy.composites.GenericCompositor
>
> prerequisites:
>
> - grey_ir108_clouds
>
> compositor: !!python/name:satpy.composites.GenericCompositor
>
> prerequisites:
>
> - deepconvection_masked
>
> standard_name: ir108_deepconvection
>
> _and in enchancement/generic.yaml_
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Thanasis Karagiannidis

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Dec 31, 2021, 11:44:16 AM12/31/21
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Dear Dave

No problem at all with the "late" reply. It is holidays!

My " ir108_deepconvection" composite is a failed attempt to solve the problem I described in the beginning of my e-mail and with the images I sent. Overlay one field on another filed.

In the "lower" field I have the IR108 and on top of it the WV62-IR108 difference (the later only if the value of that difference is over -4).

So I though: lets create the difference WV60-IR108 and mask it for values <-4 (done!) and then plot it on top of IR108. But I fail to successfully overlay the two fields. My " ir108_deepconvection"is that attempt.


Best regards and a happy new year!

Sakis

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David Hoese

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Dec 31, 2021, 4:24:53 PM12/31/21
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Sakis,

Ah ok. So composites can't really be configured that way. A composite
definition has one compositor and one set of prerequisites. What you are
looking for is a "BackgroundCompositor" which should put one image on
top of another. So for your case if you replace your
ir108_deepconvection composite with the following it should work:

ir108_deepconvection:
compositor: !!python/name:satpy.composites.BackgroundCompositor
prerequisites:
- deepconvection_masked
- grey_ir108_clouds
standard_name: ir108_deepconvection

This should make the "grey_ir108_clouds" the background and the
"deepconvection_masked" the foreground. You'll also need to update your
enhancement as they have the same mis-configuration (configuring
multiple enhancements in one enhancement section). You'll need to define
one enhancement for deepconvection_masked which you already have, then
one for grey_ir108_clouds, and then finally a simple one for the overall
ir108_deepconvection composite. So if you replace your
ir108_deepconvection enhancement with:

ir108_deepconvection:
standard_name: ir108_deepconvection
operations:
- name: crude_stretch
method: !!python/name:satpy.enhancements.stretch
kwargs:
palettes:
- {stretch: "crude", min_value: 0.0, max_value: 1.0}

Then it should work, but this assumes you have another section defined
for "grey_ir108_clouds" already. Let me know how it goes.

Dave
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Thanasis Karagiannidis

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Jan 2, 2022, 3:34:08 AMJan 2
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Dear Dave and all, Happy New Year!

I didn't think that the background compositor could work that way. I had the impression that it only works with static images as background.

Your solution work just fine, with a small change. In the ir108_deepconvection enhancement I had to replace

         kwargs:
           palettes:
             - {stretch: "crude", min_value: 0.0, max_value: 1.0}

with

        kwargs:
          stretch: crude
          min_stretch: 0.0
          max_stretch: 1.0

Thank you very much for your help.

Best regards

Sakis

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David Hoese

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Jan 2, 2022, 3:42:18 PMJan 2
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Glad you got it working. And about the change on the enhancement, sorry
about that. That's what I get for copying and pasting. Let us know if
you have any other issues.

Dave
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