[Gvsig_english] Gvsig_internacional Digest, Vol 185, Issue 1

Mario Carrera mcarrera at gvsig.com
Thu Jul 15 14:23:05 CEST 2021 

Hi Sean,

I haven't found the files that you are speaking about to see how they 
are. There are several options to sum up population depending on the 
origin layers.

If you have a polygon layer and population is a point or polygon layer, 
you would use "In-polygon spatial join", from:
Tools->Geoprocessing->Toolbox, and then Sextante->Tools for polygon 
layers->In-polygon spatial join
And here you have an example: 
https://blog.gvsig.org/2019/05/20/from-points-to-polygons-how-to-calculate-population-by-block/ 


If both layers are polygon layers and the population layer has a field 
with population, you can apply a Spatial join or Intersect geoprocess 
first to add the field with the region or river basin, and finally you 
apply a Dissolve geoprocess on the new layer, dissolving by that field 
and applying SUM of population field.

Best regards,
  Mario


El 14/7/21 a las 21:28, Sean McKenzie escribió:
>
> Hi,
>
> I want to take a file like this, wd_bas30s_po.shp, that comes from 
> https://www.hydrosheds.org/ <https://www.hydrosheds.org/>, and sum up 
> the population data from this file, popc_1800AD.asc, which comes from 
> the HYDE database.I want to count the population per river basin.
>
> Ultimately, I want to use files like popc_1800AD.asc and sum the data 
> in them by regions I define, which will in general be river basins, 
> aggregations of river basins, or sub divisions of river basins.In 
> places without rivers it will be something else, like islands.
>
> I have not been able to this.
>
> Can anyone tell me how, or direct me to a book, video, article etc. 
> that will tell me how?
>
> Thanks.
>
>
>
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> Dear all,
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> The July 2021 issue has been uploaded onto GeoForAll website
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> Faculty of Education
> School of Primary Education
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> Message: 2
> Date: Wed, 7 Jul 2021 17:34:36 +0000
> From: SERGIO ACOSTAYLARA <sergio.acostaylara en mtop.gub.uy>
> To: "gvsig_internacional en listserv.gva.es"
>         <gvsig_internacional en listserv.gva.es>
> Subject: [Gvsig_english] Vol.7 no.07 GeoForAll Newsletter
> Message-ID: <1625679277045.9484 en mtop.gub.uy>
> Content-Type: text/plain; charset="windows-1253"
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> Dear all,
>
> The July 2021 issue has been uploaded onto GeoForAll website
> (https://www.osgeo.org/initiatives/geo-for-all/ and/or
> https://www.osgeo.org/initiatives/geo-for-all/geo-newsletters-archive/) 
> in pdf
> format and in Spanish.
> I would like to thank all those who helped with their contributions to
> have both editions and ask for new volunteers to join the Newsletter
> by sending their articles, announcements, news, etc.
>
> For those who would like to send articles, news, etc., to be published
> in the next issue (August 2021 issue) please have in mind that the
> deadline is July, 27.
> Please, if you know about a conference/webinar or you are going to
> organize one, send a reminder much earlier so we can disseminate it
> through our Newsletter.
>
>
> Have a nice reading
> Nikos Lambrinos
>
> --
> ??????????? ???????????? ????????????
> ?? ??????????? ??? ?????????????????? ?? ???? ?? ?????? ?????
> ????????????? ??? ? ????? ???? ??????????? ????? ??? ??? ???????????
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> ???????? ????????? ????????????. ?????? ???????????? ?? ??????????? ??
> ?????? ?????? ???? ????????? ??? ?????????, ????? ??? ??? ???????? ??
> ?????????? ?? ?????? ??? ?? ??????? ???.
> ? ??????????? ???? Internet ??? ????? ??????? ??? ???????? ?? ??? ???
> ????? ?????? ??? ??????????? ?????? ? ????????? ????? ??? ??????????
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>
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> Thank You,
> Aristotle University of Thessaloniki
>
> --------------------------------------------------------------------------------
> ??. ????? ?????????
> ????????? ??? ??????????? ??? ??????????
> ????? ????????? ???????????
> ?.?.?. 54124 ???????????
> ???.: 2310 991201 / 991230
> Email: labrinos en eled.auth.gr
> Web Page: http://users.auth.gr/labrinos/
> http://www.digital-earth.edu.gr/
> https://www.auth.gr/univUnits
>
> --------------------------------------------------------------------------------
> Dr. Nikos Lambrinos
> Professor of Geography Teaching
> President of the Hellenic digital earth Centre of Excellence
> Faculty of Education
> School of Primary Education
> Dept. of Science and New Technologies
> Aristotle University of Thessaloniki
> GR-54124 Thessaloniki, Greece
> Tel: +30 2310 991201
> Email: labrinos en eled.auth.gr
> Web Page: http://users.auth.gr/labrinos/
> http://www.digital-earth.edu.gr/
> https://www.auth.gr/en/univUnits
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-- 

*Mario Carrera*

gvSIG Association / Asociación gvSIG

http://www.gvsig.com <http://www.gvsig.com/>


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