[GRASS-dev] r.pi.grow addon explanation

GRASS GRASS developer
1

Hi devs,

I am interesting to try out the different functions provided by the r.pi.* toolset. For r.pi.grow the manual page is mostly empty. Is there any basic information available about the options / different input parameters? If somebody can provide me with some basics, I can try do draft some text and examples for the manual page.

Cheers,
Paulo

2

Hi Paulo,

Paulo van Breugel <p.vanbreugel@gmail.com> schrieb am Do., 15. Juli 2021, 18:00:

Hi devs,

I am interesting to try out the different functions provided by the r.pi.* toolset. For r.pi.grow the manual page is mostly empty. Is there any basic information available about the options / different input parameters? If somebody can provide me with some basics, I can try do draft some text and examples for the manual page.

I’m afraid not too much besides the original paper:

https://doi.org/10.1111/2041-210X.12827

Best,
Markus

Cheers,
Paulo

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3

Hi Martin,

Thanks for the explanation. Sounds similar to what r.clump does. Would it be an idea to add your explanation to the help file, for the next one that stumbles upon it?

Cheers,

Paulo

Hi Paulo,

the r.pi.grow is mainly just a helper function to define connected patches. It is not meant to be executed independently.

All pixel that are connected (either 4 or 8 cell neighborhoods) are defined as one patch (with unique ID) and used in subsequent functions like r.pi.index, r.pi.odc etc.

hope that helps. regards, Martin

Thanks Markus, I read the, interesting, paper.

···

On 15.07.21 18:09, Markus Neteler wrote:

Hi Paulo,

Paulo van Breugel <p.vanbreugel@gmail.com> schrieb am Do., 15. Juli 2021, 18:00:

Hi devs,

I am interesting to try out the different functions provided by the r.pi.* toolset. For r.pi.grow the manual page is mostly empty. Is there any basic information available about the options / different input parameters? If somebody can provide me with some basics, I can try do draft some text and examples for the manual page.

I’m afraid not too much besides the original paper:

https://doi.org/10.1111/2041-210X.12827

-- 
Dr. Martin Wegmann

University of Wuerzburg
Institute of Geography
Department of Remote Sensing
Remote Sensing and Biodiversity Research
Am Hubland
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German Aerospace Center (DLR)
German Remote Sensing Data Center (DFD)

Phone:  +49-(0)931-31 83446
Email:  [martin.wegmann@uni-wuerzburg.de](mailto:martin.wegmann@uni-wuerzburg.de)

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