Survey of India published - District, Block and Village Boundaries

[Craig Dsouza]

Hey,

has anyone written any scripts or downloaded & explored these?

https://onlinemaps.surveyofindia.gov.in/Digital_Product_Show.aspx

It seems SOI is now publishing District, Block and Village Boundaries in vector formats for free

[Justin]

Great find! I am pretty sure you need a cell phone in India to actually create an account/ access?

[chris mathen]

Yes otp send to mobile number

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[sreeram kandimalla]

Any download limits per day per user?

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[Craig Dsouza]

Seems like it yes.

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[Craig Dsouza]

Sorry, i thought i was replying to Justin. I don't know if there are any download limits, except that you can only download one district at a time.

[Sharad Lele]

Thanks Craig for locating this dataset. Potentially solves all our problems. Yes, can add only one district at a time to the Shopping Cart, but can in theory keep going back and adding more items to the Cart (I did 2 at a time). Process for checking out and creating downloads involves many clicks... bit idiotic. But some substantive limitations after I downloaded and checked Dindori in MP:

1. Village boundaries do match latest village shapes from revenue layers, BUT they are east-shifted by 200m (they must have goofed the datum)
2. Polygons don't have any census ID, so linking to other data will require adding those manually (!!) or figuring out what numbering system SOI has used. Any thoughts on that?
3. I tried Andhra Pradesh two districts Vizag and Srikakulam, and it says "data not available yet". So the dataset is still in the making. Not sure what is available and what is not, overall.

Sharad

[J M]

compiling here: https://github.com/justinelliotmeyers/INDIA_SOI_2022

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[Arun Ganesh]

For those interested in inspecting and cleaning up the data, there's been active discussion about it on the OpenStreetMap India group https://t.me/OSMIndia 

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[Prabhakar Rajagopal]

Ddar Arun, 

Please check the link. 

I am unable to access the url. https://t.me/OSMIndia 

Prabhakar

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[Sabyasachi Kabiraj]

1st login than you will able to download. 

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[Devdatta Tengshe]

I had played around with this data a couple of days ago.

One Important thing to note is that count does not match either the one from LGD or the census.

For example, SOI  has 4723 Sub Districts, while LGD has 7021.

Similarly, SOI has 742 Districts, while LGD has 763.

Regards,

Devdatta

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[Shubham]

Just a note that there is a  recurring  mistake wherein random alphabets in names have been replaced by special characters like ">" or "@" etc. In the screenshot below, it looks like "a" has been replace by ">" but in other files ( I have checked Ahmadabad and Belagavi village boundaries ), there are different characters popping up and  these are not limited to a certain column only.
Also there are no LGD codes mentioned so joining with other datasets will prove difficult.

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[sreeram kandimalla]

Conversions from soi manuals.. 

">", "Ā"
"<", "ā"
"|", "Ī"
"\", "ī"
"@", "Ū"
"#", "ū"

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[Blue Secret]

Hey! Do you have a reference of the SOI manual you took these from?

Thanks,

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[sreeram kandimalla]

https://surveyofindia.gov.in/documents/soichapter-vi.pdf page no:101

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[sreeram kandimalla]

Given that the page I referred to in the previous mail renders like the image pasted below on my pdf viewer, it wasn't that simple to get the mappings out.

First I had to ascertain that there was data past the cutoff portion. 

For that, I used http://brendandahl.github.io/pdf.js.utils/browser/ 

(This is a very handy tool for anyone who has had the misfortune of having to deal with pdfs that just won't render properly or won't get parsed properly. 

A bit of knowledge of the pdf spec is needed. But, this tool has helped me debug a lot of pdf issues. I hope others find it useful too.)

After that I used "mutool trace" from the mupdf toolkit to get all the data in the page out as hierarchical xml and then proceeded to extract the previously invisible mapping data from that xml file. 

[Vaidya]

Many of the state-level district maps have been converted to kml and uploaded here. 

https://data.opencity.in/dataset/district-maps-for-states-of-india

District level village maps are here for 4 Indian cities and Goa:
https://data.opencity.in/dataset/villages-maps-for-major-cities-of-india

Thanks,
Vaidya

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