geopython/Lobby

https://geopython.github.io

Jorge Samuel Mendes de Jesus

@jorgejesus

The birdhouse project uses massibvaly pywps

they have emu that is for setting up WPS services for testing

https://emu.readthedocs.io/en/latest/tutorial/using_docker.html

María Arias de Reyna

@Delawen

Hi!

I have a junior python developer friend that wants to start contributing with open source on hacktober (this month). She's good and she asked me if I know of any python project where she can ask and start. Is anyone interested in mentoring her and give her some tasks to do? No geo background.

María Arias de Reyna

@Delawen

@anitagraser @tomkralidis @kalxas @jorgejesus @justb4 ...

She already contributed to sagemath, but no mentorship and no help, I would like her to have some guidance this time

Angelos Tzotsos

@kalxas

hi @Delawen

María Arias de Reyna

@Delawen

hiç

Angelos Tzotsos

@kalxas

perhaps she wants to dive in to the geopython workshop material and we can provide some guidance

the most active project right now I guess is pygeoapi

María Arias de Reyna

@Delawen

and where should I tell her to direct her answers about pygeoapi? https://gitter.im/geopython/pygeoapi ?

Angelos Tzotsos

@kalxas

yes

María Arias de Reyna

@Delawen

Thanks :)

Angelos Tzotsos

@kalxas

welcome :)

María Arias de Reyna

@Delawen

hope she becomes a contributor soon :D

Tom Kralidis

@tomkralidis

Docs are also welcome.

Jorge Samuel Mendes de Jesus

@jorgejesus

and where should I tell her to direct her answers about pygeoapi? https://gitter.im/geopython/pygeoapi ?

Yes, the project is very active and she can help on multiple things from docs, small code patches, testing, dataprovider implementations, also the project is very frienly and open to suggestions

Tom Kralidis

@tomkralidis

hi all: anyone use rasterio? I’m looking for how to do spatial subsetting (minx, miny, max, maxy) ?

Jorge Samuel Mendes de Jesus

@jorgejesus

only for a specific x,y

Jorge Samuel Mendes de Jesus

@jorgejesus

If I remember you need to use the window

https://rasterio.readthedocs.io/en/latest/topics/windowed-rw.html#windows

dont you have an example on the geopython workshop from bucharest, I recall that Jachym had a good example on his tutorial

Tom Kralidis

@tomkralidis

does window take geographic coords though?

Jorge Samuel Mendes de Jesus

@jorgejesus

Should only be

Just van den Broecke

@justb4

@tomkralidis hope I understand correctly, slicing out a rectangle from a raster based on geo-coords? With CLI I would use gdal_translate, possibly there is a way via Python API.

Tom Kralidis

@tomkralidis

thanks @justb4 and @jorgejesus. Use case is using rasterio for pygeoapi coverage implementation

Jorge Samuel Mendes de Jesus

@jorgejesus

https://gis.stackexchange.com/questions/299787/finding-pixel-location-in-raster-using-coordinates

you need to convert the lat,lon coordinates into X.Y (have code somehwere for it) but the link above uses rasterio

and is simpler

(check the solution bellow)

Tom Kralidis

@tomkralidis

thanks. Is it me or should the concept of clipping a raster by geographic coords be simpler?

Just van den Broecke

@justb4

@tomkralidis from the docs found rasterio.windows.from_bounds.

Anita Graser

@anitagraser

Happy new year!

Thought I'd share some MovingPandas samples with you: http://exploration.movingpandas.org

Tom Kralidis

@tomkralidis

@just I did pixel indexing which worked but from_bounds seems easier. Thanks.

Jorge Samuel Mendes de Jesus

@jorgejesus

@anitagraser Nice :)

epifanio

@epifanio

Hi @all - not sure where to post, I've a question related to the use of pydap from inside a docker-compose environment and I thought this channel is followed by very knowledgiable people who my be able to help me.
My problem is:

given a docker-compose environment with 3 containers running 3 services apache , pydap, jupyter. A simple csv file is served via both apache and via pydap
From outside the docker environment, the file is available using the host IP address without problems (using both apache and pydap)
The problem arise when I try to access the csv data from inside the jupyter service, which runs from inside the same docker network.

from the notebook I can access the data served via hyrax or via apache using the service name, but the same request fails when attemting to access the data served via pydap

@epifanio
I prepared the test , it is a basic repository with 4 docker machine:

Apache2
Pydap
Hyrax
Jupyter Notebook

It is available here: https://github.com/epifanio/Docker-Networking

@epifanio
essentially, I put some data in a volume and I made this data available in:

apache http://localhost/SN99938.nc
pydap http://localhost:9090/SN99938.nc.html
hyrax http://localhost:8080/opendap/SN99938.nc.html

and everything works as expected

I then use a jupyter container (on the same docker network) to access the same data but using the docker-machine-name defined in the docker-compose
using the pydap client I can access the data served by hyrax, or I can use wget to fetch the data served via apache ... but when trying to attemt to fetch the data served by pydap I got an error ...

this notebook shows the issue:

https://nbviewer.jupyter.org/github/epifanio/Docker-Networking/blob/18c81e30312f9db3da305c677a7884a0d670c0db/volumes/jupyter/notebooks/test.ipynb

epifanio

@epifanio

it seems that pydap server side doesn't allow the use of the service hostname used internally by docker

have you experienced something similar, do you have any clue on what is wrong?

Just van den Broecke

@justb4

From the GeoPython Conf organization:

Martin Christen, [26 jul. 2020 21:27:49]:
July 27 would have been the date for GeoPython 2020, it is really sad it didn't happen.

But I have interesting news

There will be a "mini" GeoPython 2020 online edition, September 21-22, 2020 (together with Python Machine Learning Conference). Call for proposals is open until August 17. http://2020.geopython.net/  - More information will follow!

So see http://2020.geopython.net/

Angelos Tzotsos

@kalxas

@justb4 do we have contact info for the conference organizers?

or is there anyone from the organizers here?

Just van den Broecke

@justb4

@kalxas not sure what you mean: we have submitted a pygeoapi abstract yesterday (see pygeoapi gitter), the main contact for the conf is Martin Christen, Professor FHNW Basel. He is not in this group but easy to find e.g. linkedin. There is also an open Telegram group for the conf: see http://2020.geopython.net/ (Social Media bottom of page).

DJMO3

@DJMO3

Hi everyone, I am new to geopy and python itself. I'm not sure if this is the right forum, and I would be grateful if any of you could point me to the right place for my queries. I know that geopy uses the great circle distance to calculate the distance between two coordinates but I read somewhere that this formula isn't very accurate for short distances. I have a set of stations which can get as close as 5 kilometers from each other, I wanted to know if using geopy.distance is a good idea or if there are more accurate tools for such short distances.

Just van den Broecke

@justb4

@DJMO3 never heard of geopy but it uses geographiclib . Make your question more specific: 1) are your coordinates lon/lat in WGS84? 2) what level accuracy you want to achieve (percent). Great-circle can be up to 0.5%. Better is to use geodesic distance, supported by geopy. Many geo-folks use proj but looks like your case can be covered with geopy. Their main comm-channel is StackOverflow.

DJMO3

@DJMO3

Thank you for your time. I am using the WGS84 lat/long format but still need some more research and testing to determine the level of accuracy. I will be looking further into the geodesic and proj library too.

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