[OSGeo-Discuss] increase efficiency of analysis with r.grow.distance aka Euclidean allocation

[karsten]

Hi All,
 
I am working on a project that requires to find the middle boundary between
raster regions (of the same value) using a maximum buffer distance. The
raster input I am using is quite large like 5m resolution and 10 by
10 cells. One approach I took was to fill all cells in areas outside the
raster regions in question which I will need to buffer to NULL 
and then using the r.grow.distance in GRASS (similar to the Tool Euclidean
allocation in ArcGIS). 

This works with smaller files but with a big input like the one above
calculation time is very long or might crash even on a fast PC. The only
remedy I found (apart from throwing larger RAM or hardware at the task) 
so far was cutting up the raster file in tiles and running the analysis on
each tile and putting the results back afterwards to get to final result
layer.
 
Would anyone have hints if there are other approaches that I could increase
the efficiency of this analysis in GRASS or have any knowledge of other tool
sets such as R or python scripts that are already available for something
like this ?
 
Cheers
Karsten
 
Karsten Vennemann
  www.terragis.net
 
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[OSGeo-Discuss] PostGIS 3.1.1 Released

[Paul Ramsey]

PostGIS 3.1.1 is a minor bugfix release, covering some critical issues in 3.1.0.

https://postgis.net/2021/01/28/postgis-3.1.1/

  - #4814, Crash passing collection with only empty components to ST_MakeValid
  - #4818, Make the VSICURL synthetic driver work as documented
  - #4825, Unstable results from ST_MakeValid
  - #4823, Avoid listing the same geometry in different collections


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[OSGeo-Discuss] Why participate on OSGeo-GSoC?

[Vicky Vergara]

Dear OSgeo Community and projects

I would like to express in this letter as a mission to encourage projects
either well established OSGeo Projects, Incubating Projects, and with a
stress emphasis to Community Projects that wish to become an OSGeo Project,
to participate in GSoC.

You can find the  announcement for the current year in [1]
[1] https://lists.osgeo.org/pipermail/discuss/2021-January/039210.html

I can only speak based on experience, that is, my experience with pgRouting
on the GSoC program.

The way that pgRouting has grown in terms of code and in terms of
developers has been mainly by participating in GSoC, to a point where we
will soon apply to become an OSGeo Project. (hopefully this year).

In 2015 it was my first participation as a mentor, but since 2011 we have
been participating [2] with a grand total of 23 students. (to the best of
my knowledge)

[2] https://github.com/pgRouting/pgrouting/wiki/Google-Summer-of-Code

What is the "P/G-ain"? There is no "Gain" without "Pain"
(I quote because those are relative terms)

The "P/G-ain" as I see it:

The work as a mentor, year by year, does not become easier or harder, it is
just a matter of routine (and maybe some family time). Basically my routine
is Saturday morning (family is sleeping Saturday mornings) for at most 3
hours we have a GSoC meeting, depends on the case: with a student that is
struggling the most or with all students for a common problem, or no
meeting if everything is going smooth or family is awake :-)

Students open a draft PR  at the beginning of the week and merge their PR
at the end of the week on a special repository [3] for GSoC work. So
monitoring their work during the week really becomes with comments on their
PR as in [4] which can be done by any mentor.
[3] https://github.com/pgRouting/GSoC-pgRouting
[4] https://github.com/pgRouting/GSoC-pgRouting/pull/112

I think I spend more time with students during the bonding period (also
Saturday meetings) where they learn how is the structure of our repository
and what/where are the basics for adding more functionality to pgRouting.

The most difficult part we have as mentors is to choose the proposals to be
accepted.
>From the set of proposals, this year:
* Filter out proposals with Incomplete pgRouting application requirements
[5]
* Filter out proposals with incomplete OSGeo or GSoC requirements
* Give an evaluation number to the students
* Decide (based on number of mentors) how many proposals we can manage
* Send our evaluation & decision to the OSGeo-GSoC administrators, so they
can follow  the next step of the process with Google

[5]
https://github.com/pgRouting/pgrouting/wiki/GSoC-Ideas%3A-2021#pgrouting-application-requirements

The detailed benefits
- In terms of code
- In terms of collaborators
- In monetary terms -> OSGeo

In terms of Code
In the time that I arrived at pgRouting, v2.0.0 was the latest, I could
enumerate the  routing related function signatures that it had back in
those days, just because they are so few, but you can find them in [6].
That includes the internal functions that are used. Compare with what we
are preparing for v3.2 [7]: 32 VS 289 signatures (internal & public), and
most of the new functionality has been done by GSoC students.

[6]
https://github.com/pgRouting/pgrouting/blob/v2.6.3/sql/sigs/pgrouting--2.0.0.sig
[7]
https://github.com/pgRouting/pgrouting/blob/develop/sql/sigs/pgrouting--3.2.sig

In terms of collaborators:
Some students stay on the project after the GSoC, For example Rohith was
active, not only as a developer, but also as a speaker in FOSS4G Dar Es
Salaam.
Currently we have Ashish who is taking over the task of making releases.
Rajat whom I meet personally in Hyderabad on FOSS4G Asia before he became a
GSoC student, since last year he is one of the OSGeo-GSoC administrators,
he is also now a GSoC mentor, member of the PSC in MapMint, and he is
collaborating with the pgRouting workshop.

In monetary terms -> OSGeo:
Google deposits money per student  that finalizes the program to OSGeo.
In my mind, by doing mentor work we are making OSGeo get more income for
the year's needs. I donated my time as a mentor, OSGeo got a donation in
the form of $.

I see this money that OSGeo got from pgRouting students as a cooperation
for the OSGeo community projects budget that OSGeo assigns every year and
as a cooperation for the incubating expenses budget for the projects that
are in incubation the year when OSGeo received the money, of the year or as
a cooperation for other well established projects budget. (I did not
understand myself so I am putting an example).

Suppose that pgRouting had 3 students and suppose that OSGeo got a total of
$1500 on year X.
In my mind I think: For year X those $1500 are going to help on funding
project Y on its incubation expenses or community project Z on outreach
expenses to get more developers, or for OSGeo project W that has an
unexpected expense, or something I didn't think about were it could 

Re: [OSGeo-Discuss] [OSGeo @ GSoC 2021] Call for Projects to Prepare Project Ideas Page for Google Summer of Code 2021

[Rajat Shinde]

Hello Vicky,

Thanks for the additions! :)

Kind regards.

On Thu, Jan 28, 2021 at 9:01 PM Vicky Vergara  wrote:

> Hello Community
>
> I would like a small summary about the difference between last year and
> this year:
>
> What are the changes for 2021 from 2020?
>
>1. *Smaller project size** - *all students participating in the 2021
>program will be working on a 175 hour project (instead of a 350 hr
>project).
>Reasoning from GSoC administrators:
>
>
>- Currently we are missing out on many wonderful students who could
>never commit to such a huge project and time commitment but would be great
>contributors to your community. This is a significant change as we now are
>no longer strongly encouraging students to focus only on GSoC over their
>summer. Students have many other responsibilities especially during the
>pandemic that make it hard for them to spend 30 hours a week on a project.
>- We realize this is going to require all of you to think about
>smaller projects and update your project ideas.
>
>
>1.
>
>*2 evaluations  (instead of 3)* - There will be an evaluation after 5
>weeks and the final evaluation will take place after the 10th week. We are
>also no longer requiring students complete their first evaluation (though
>we encourage them to do so), so if a student doesn’t complete the first
>evaluation they will not automatically be removed from the program. They
>are still required to complete the final evaluation.
>2.
>
>*Eligibility requirements* - In 2020 there are many ways students are
>learning and we want to acknowledge that so we will be allowing students
>who are 18 years old AND currently enrolled (or accepted into) a
>post-secondary academic program as of May 17, 2021 or have graduated from a
>post-secondary academic program between December 1, 2020 and May 17, 2021
>to apply to the GSoC program.
>
>
>- What this means is that now the program will be open to folks
>participating in a variety of different academic programs, not just
>accredited university programs. This includes licensed coding camps,
>community colleges, and many other programs that may not be accredited yet
>but are post-secondary academic programs.
>
> Regards
> Vicky Vergara
> GSoC Mentor since 2015
>
> --
>
> Georepublic UG (haftungsbeschränkt)
> Salzmannstraße 44,
> 81739 München, Germany
>
> Vicky Vergara
> Operations Research
>
> eMail: vi...@georepublic.de
> Web: https://georepublic.info
>
> Tel: +49 (089) 4161 7698-1
> Fax: +49 (089) 4161 7698-9
>
> Commercial register: Amtsgericht München, HRB 181428
> CEO: Daniel Kastl
>
>
>
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Re: [OSGeo-Discuss] [OSGeo @ GSoC 2021] Call for Projects to Prepare Project Ideas Page for Google Summer of Code 2021

[Vicky Vergara]

Hello Community

I would like a small summary about the difference between last year and
this year:

What are the changes for 2021 from 2020?

   1. *Smaller project size** - *all students participating in the 2021
   program will be working on a 175 hour project (instead of a 350 hr
   project).
   Reasoning from GSoC administrators:


   - Currently we are missing out on many wonderful students who could
   never commit to such a huge project and time commitment but would be great
   contributors to your community. This is a significant change as we now are
   no longer strongly encouraging students to focus only on GSoC over their
   summer. Students have many other responsibilities especially during the
   pandemic that make it hard for them to spend 30 hours a week on a project.
   - We realize this is going to require all of you to think about smaller
   projects and update your project ideas.


   1.

   *2 evaluations  (instead of 3)* - There will be an evaluation after 5
   weeks and the final evaluation will take place after the 10th week. We are
   also no longer requiring students complete their first evaluation (though
   we encourage them to do so), so if a student doesn’t complete the first
   evaluation they will not automatically be removed from the program. They
   are still required to complete the final evaluation.
   2.

   *Eligibility requirements* - In 2020 there are many ways students are
   learning and we want to acknowledge that so we will be allowing students
   who are 18 years old AND currently enrolled (or accepted into) a
   post-secondary academic program as of May 17, 2021 or have graduated from a
   post-secondary academic program between December 1, 2020 and May 17, 2021
   to apply to the GSoC program.


   - What this means is that now the program will be open to folks
   participating in a variety of different academic programs, not just
   accredited university programs. This includes licensed coding camps,
   community colleges, and many other programs that may not be accredited yet
   but are post-secondary academic programs.

Regards
Vicky Vergara
GSoC Mentor since 2015

-- 

Georepublic UG (haftungsbeschränkt)
Salzmannstraße 44,
81739 München, Germany

Vicky Vergara
Operations Research

eMail: vi...@georepublic.de
Web: https://georepublic.info

Tel: +49 (089) 4161 7698-1
Fax: +49 (089) 4161 7698-9

Commercial register: Amtsgericht München, HRB 181428
CEO: Daniel Kastl
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[OSGeo-Discuss] [OSGeo @ GSoC 2021] Call for Projects to Prepare Project Ideas Page for Google Summer of Code 2021

[Rajat Shinde]

Dear All,

Greetings!

It is the time of the year to start preparing for the OSGeo's participation
with the Google Summer of Code 2021 [1] and we need your help for the same.
With a 100% success for all the GSoC 2020 student projects [2], we are
highly excited and motivated to invite the OSGeo projects (Projects,
Incubation projects, Guest Projects) to begin compiling the project ideas
for GSoC 2021.

In order to participate in proposing ideas as a project under OSGeo
umbrella organisation, you just need to send us (admins:  ) the URL for your project's GSoC ideas Wiki page. If you are
participating for the first time, then you may visit [3] [4] for reference.

Please remember that every idea should indicate:

• A title
• A description
• 2 Mentors' Details
• A test for the students to submit to your evaluation. The test aims
at evaluating if the student is capable for the project, so please design
the test having in mind the basic skills required to complete the project.

The organisation application period starts Jan 30, 2021 and will be open
till Feb 20, 2021. So, we expect all the URLs by Feb 10, 2021. Here is the
complete GSoC 2021 timeline [5].

*Note:* GSoC 2021 comes with some new changes in the program. We sincerely
request to go through the announcement mentioning new changes [6].

Thanks and please forward the information to your respective projects
mailing list!

Kind regards,
Rahul and Rajat
(On behalf of the OSGeo GSoC Admins Team)

[1] https://summerofcode.withgoogle.com/
[2] https://wiki.osgeo.org/wiki/Google_Summer_of_Code_2020
[3] https://github.com/pgRouting/pgrouting/wiki/GSoC-Ideas:-2021
[4] https://wiki.osgeo.org/wiki/Google_Summer_of_Code_2020_Ideas
[5] https://summerofcode.withgoogle.com/how-it-works/#timeline
[6]
https://opensource.googleblog.com/2020/10/google-summer-of-code-2021-is-bringing.html
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Re: [OSGeo-Discuss] UK Food Poverty: Measurement and risk mitigation

[Suchith Anand]

Dear colleagues,


Please join tomorrow’s (29th Jan 2021) GODAN webinar and discussions on UK Food 
Poverty: Measurement and risk mitigation. Details at  
https://www.godan.info/events/uk-food-poverty-measurement-and-risk-mitigation



Through this webinar series, we want to share research outputs and examples of 
work done in this theme at various UK universities.  University of 
Southampton’s research is a good example of how geospatial science and open 
data can help in developing measures to alleviate food poverty in the UK.  We 
would like to bring together all  universities working in theme to share 
examples of their research projects, publications etc so we all can learn from 
each other and work together to alleviate food poverty in the UK and everywhere.


The pain of hunger is the same for the hungry everywhere (in the developed 
economies or developing economies). We cannot ignore food poverty issues faced 
by economically poor families globally. We need to find solutions to alleviate 
food poverty everywhere.


I am grateful to everyone, everywhere working for Zero Hunger Aim.


Best wishes,


Suchith



From: Suchith Anand 
Sent: 23 January 2021 07:57
To: discuss@lists.osgeo.org ; GeoForAll 

Subject: UK Food Poverty: Measurement and risk mitigation




Dear colleagues,


I would like to invite you to GODAN Webinar covering UK Food Poverty and 
insecurity on 29th January 2021. Hidden hunger is a growing issue in developed 
economies.


Household food insecurity, or food poverty, is an ongoing challenge in the 
United Kingdom. There has been no systematic measurement of this growing public 
health and social justice problem until recently, with much data yet to be 
released. When the data are shared in early 2021, it will be at coarse 
geographic scales that will not allow for local planning of activities to 
address food poverty.


To address this knowledge gap, a team of researchers and experts at the 
University of Southampton have been developing a series of tools and projects 
to facilitate mapping and sharing of spatial open data, aimed at better 
informing local government and third sector/civil society.


The team are responsible for initiatives such as mylocalmap, a publishing 
platform for food poverty risk measures, devised in collaboration with 
Southampton City Council and agricultural policy advocates Sustain; and 
CITISCAPE, a citizen science based project enabling direct feedback between 
young adults and the City Council regarding their local built environment.


The webinar will be presented by Dr Dianna Smith (University of Southampton). 
Dianna is a lecturer in GIS and health geography, with over 15 years of 
experience in health inequalities and food insecurity research. She developed a 
model of food poverty risk used nationally in local government and contributes 
to Joint Strategic Needs Assessments (JSNAs) on food insecurity across many UK 
local authorities, guiding data collection and analysis.


More details  at 
https://www.godan.info/events/uk-food-poverty-measurement-and-risk-mitigation



I  would also like to take this opportunity to thank GeoData Institute and 
School of Geography & Environmental Science at University of Southampton for 
their help to GeoForAll initiative many years back.  It was University of 
Southampton who kindly developed and hosted the initial GeoForAll website for 
free and established the Open Source Geospatial Lab at Southampton 
http://www.osgl.soton.ac.uk/researchers


I will always be grateful for the support that University of Southampton 
colleagues kindly provided for the start of GeoForAll initiative many years 
back.



I am grateful to everyone, everywhere working for Zero Hunger Aim.


Best wishes,


Suchith



Dr Suchith Anand

Chief Scientist

Global Open Data for Agriculture and Nutrition

https://www.godan.info

https://www.researchgate.net/profile/Suchith_Anand






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