Re: [datameet] any help with geocoding and reverse geocoding without api or from open source

[Nikhil VJ]

Hi Deepak,

I was digging up regarding this recently and tried one option that didn't
work out; sharing my notes:

Starting rule : Cannot rely on 3rd party service; needs to be self-hosted;
use OSM country extract from https://download.geofabrik.de/ as base data.

Starting point:

OSM wiki page listing several different software for searching places:

https://wiki.openstreetmap.org/wiki/Search_engines


Osmnames + Sphinxsearch :

This seemed easier to start off so tried it. Once I got it depoyed, didn't
get any proper results even for city names. I'm guessing the parameters may
require fine-tuning. And I couldn't understand why they are involving
wikipedia. It seemed like the search was relying more on data from
wikipedia than from OSM.

Didn't explore on it further. (Spare time burned up!)


Nominatim related leads, where I want to dig into in next sprint:

https://www.cascadia-analytics.com/2017/10/01/nominatim-docker.html

https://github.com/mediagis/nominatim-docker


Pelias seems promising too, but we need a proper elasticsearch deployment
to run it and that takes up quite some memory.


-


My personal observations, may be inaccurate:

We should treat geocoding and reverse geocoding as two different
applications.


Reverse geocoding would be much simpler to do, since you just need to put
in the lat-longs and cough up the closest place names.


Geocoding involves complicated textual search, especially given the
variations in ways place names are stored. There has to be high flexibility
like making up for spelling differences. So elasticsearch seems like a good
fit for it. Then, geo-constraining searches is very important here. We need
ways to progressively narrow down the search areas and cut out false
positives. Letting the user draw a box on the map to search in, for
example, can greatly increase effectiveness of results rather than
searching the whole country / planet data.

--
Cheers,
Nikhil VJ
https://nikhilvj.co.in


On Sun, Apr 19, 2020 at 8:26 AM Bhanu K  wrote:

> Hi Deepak,
>
> Few options depending on the tool:
>
> - if Google Sheets is an option, Geocode by Awesome Table
> 
> is a good add-on.
> - if Microsoft Excel is an option, geocode-excel
>  is an offline version.
> - Nominatim API 
> can be used in a language of your choice.
>
> thanks,
> Bhanu
>
>
> On Sat, Apr 18, 2020 at 5:00 PM Deepak Sharda 
> wrote:
>
>> i googled and get this site address which is open source of geocoding and
>> reverse geocoding but i am not expert in node.js  could you help .
>>
>>
>> is it helpful for data relating to india.
>>
>>
>> there was a file aattached as sample data for india
>>
>> https://github.com/pelias/pelias
>>
>> --
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>> 
>> .
>>
>
>
> --
> Bhanu
>
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> .
>

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Re: [datameet] any help with geocoding and reverse geocoding without api or from open source

[Bhanu K]

Hi Deepak,

Few options depending on the tool:

- if Google Sheets is an option, Geocode by Awesome Table

is a good add-on.
- if Microsoft Excel is an option, geocode-excel
 is an offline version.
- Nominatim API 
can be used in a language of your choice.

thanks,
Bhanu


On Sat, Apr 18, 2020 at 5:00 PM Deepak Sharda  wrote:

> i googled and get this site address which is open source of geocoding and
> reverse geocoding but i am not expert in node.js  could you help .
>
>
> is it helpful for data relating to india.
>
>
> there was a file aattached as sample data for india
>
> https://github.com/pelias/pelias
>
> --
> Datameet is a community of Data Science enthusiasts in India. Know more
> about us by visiting http://datameet.org
> ---
> You received this message because you are subscribed to the Google Groups
> "datameet" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to datameet+unsubscr...@googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/datameet/a672e807-c8dd-4dba-8d79-f407aa076cb1%40googlegroups.com
> 
> .
>


-- 
Bhanu

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[datameet] Wardwise population density

[blessing isaiah]

Hi all,

Where can I find wardwise population density data for Bangalore.

Best regards,
Blessing Isaiah

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[datameet] Re: Taluka level maps data

[Sharad Lele]

Also check out:

https://sedac.ciesin.columbia.edu/

On Saturday, 18 April 2020 07:43:25 UTC+5:30, Naveen Francis wrote:
>
>
> https://wiki.openstreetmap.org/wiki/Subdistricts_in_India
>
> On Friday, 17 April 2020 21:55:53 UTC+5:30, Mitul Jhaveri wrote:
>>
>> Folks, 
>>
>> Would anyone of you have a csv file with Taluka name, District Name, 
>> Polygon ID, Sub-polygon ID and point orders for all talukas in India? 
>>
>> Please let me know.
>>
>> Best,
>> Mitul 
>>
>

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