Bumping this up, because I don't think this issue has been resolved
yet. I now have 4 different versions of Indian administrative
boundaries, and my current nightmare is getting protected area
boundaries to line up with them accurately.
What's the best *open* version of Indian administrative boundaries,
down to the Tehsil/Block level, and is there a place from where it is
easily available?
(I'm not even going to ask for village-level data, because among other
things, what we're doing now is digitising revenue village maps
because the MRD itself doesn't have digitised village level data...yet.)
On Tuesday, January 27, 2015 at 2:02:37 PM UTC+5:30, D Thakker wrote:
Eric, in my research / experience i have found that Sub-district,
Mandal, Taluka, Tehsil means same and are division of District
when it comes to Census.
But for Revenue dept boundaries are drawn and managed by district
administrative bodies who report to state administration only.
So for census - District and Sub-district are well defined
boundaries, and I understand from 2011 Census India has bought a
started numbering system which should make future data
reconciliation easier
But for land revenue depaetment - it really depends on the local
administrative reach and function, and is managed and controlled
by state admin bodies.
For eg. Surat has some discrepancy when it comes to Revenue and
Census boundaries. This was something I came across and even local
admin bodies in Surat were not aware
On Thursday, August 7, 2014 at 8:15:45 PM UTC+5:30, Eric Dodge wrote:
This is very interesting Sharad.
I've been looking for maps of what I've been calling
administrative blocks, that is, the units overseen by block
development officers. MGNREGA data is aggregated at this level
and I've been hoping to use the data to do some mapping exercises.
The census sub-districts are called differently across states
(tahsil, taluk, mandal, etc). You can see the list here:
http://censusindia.gov.in/Tables_Published/Admin_Units/Admin_links/subdistrict_nomeclature.html
<http://censusindia.gov.in/Tables_Published/Admin_Units/Admin_links/subdistrict_nomeclature.html>
I know that in all the states where census sub-districts are
called taluk, mandal, or CD block (with the exception of TN),
the census sub-district is identical to the administrative block.
I've already completed a mapping exercise for Bihar using the
census sub-district map and the data matched up pretty well.
If the IND_adm3 data is indeed the administrative blocks then
I could do a similar exercise with Madhya Pradesh. I'll take a
look to see if the data lines up correctly.
Has anybody dug into this issue any deeper? I've heard that
tehsil comes from the revenue side whereas taluk, mandal, etc
comes from the administrative side but that doesn't explain
why the census uses different sub-district units across states.
Best,
Eric
On Thu, Aug 7, 2014 at 7:39 AM, Sharad Lele
<[email protected]> wrote:
If I am right, then Justin may want to rename his layer as
CDBlocks_2001...
Sharad
On Thursday, August 7, 2014 4:28:17 PM UTC+5:30, Sharad
Lele wrote:
I think I have the explanation for why I am seeing a
good match and you are not:
The problem lies in defining what is the
'sub-district' unit (in IND_adm3). Administratively
speaking, it is tehsil, below which lies CD block.
Unfortunately, census gives information by CD block.
So there are more 'sub-district' units in Census than
tehsils in the country. GDAM seems to have followed
the tehsil concept.
To check: Karnataka is one state in which tehsil and
CD block are one and the same. That is why the
sub-district layer IND_adm3 matches perfectly for
Karnataka, but not for other states. There might be
some other states where this holds good, I don't know.
Anyway, so if one really wants CD block level
boundaries, we have to look at Justin, I guess.
But the GDAM boundaries are not 'wrong'.
Sharad
On 07-Aug-14 9:48 AM, Devdatta Tengshe wrote:
In Continuation of my previous email, here is a CSV
file which shows just how bad the GDAM dataset is.
Regards,
Devdatta
On Thu, Aug 7, 2014 at 9:06 AM, Devdatta Tengshe
<[email protected]> wrote:
Hi Sharad,
I just download the GDAM data again, to confirm
what you have said.
I'm going to have to disagree with you about the
quality of the IND_adm3 data.
Acoording to the 2001 Census, there are 5454 Sub
Districts in India
<http://www.socialjustice.nic.in/pdf/tab11.pdf>.
The GDAM dataset has just 2299 features.
So clearly these taluk features do not correspond
to the 2001 Census. I cross checked for some
areas I have ground knowledge of, and I can say
that this dataset is not from any specific era.
Some tehsils in the file were created post 2001,
while others created in the 90's were not present.
In my opinion the GDAM data is pretty much unusable.
Regards,
Devdatta
On Wed, Aug 6, 2014 at 11:36 PM, Sharad Lele
<[email protected]> wrote:
I have downloaded and checked the GADM
boundaries (my version is 2011). The taluka
boundary layer probably holds good today,
becuase few talukas get split. Districts get
split regularly (every so many years) so the
district boundary layer in this GADM set is
quite of date (may apply to 2001 or so). The
spatial registration (positional accuracy is
~1km, and the spatial detail is of course not
as good as the boundaries given in a Survey
of India 50k topo, but then that is an unfair
standard, so by a more generalized standard,
the quality is okay.
Sharad
On Monday, August 4, 2014 7:20:38 PM
UTC+5:30, Dilip Damle wrote:
Mr Thakkar,
Please also look at another post (more
than one) on this group about Taluk
Shapefiles by Justin Meyers
So far as I know GADM is the source that
has Taluk files.
I am not sure about its completeness and
accuracy as on today
http://www.gadm.org/
On Monday, August 4, 2014 6:23:07 PM
UTC+5:30, D Thakker wrote:
thanks Dilip for your hardwork.
I have been on a lookout for all
taluka / tehsil shape file, so how do
I be in a loop as I am very keen to
see the repository mail / list.
On Monday, August 4, 2014 9:50:26 AM
UTC+5:30, Dilip Damle wrote:
Sharad,
I am working on some things will
revert in about a week or may be
more.
Thejesh,
Go ahead,
Actually there was one more
source a Low Resolution
(vertices) District map by VDS
technologies.
I have it as Polylines in
Autocad. I seem to have lost the
original file.
If anyone has then please share
it. (it does not seem to be on
their site now)
On Sunday, August 3, 2014
11:32:43 PM UTC+5:30, Thejesh GN
wrote:
Actually its not a bad idea
to list it on the wiki. Let
me know i will create an
account.
--
Thejesh GN ⏚ ತೇಜೇಶ್ ಜಿ.ಎನ್
http://thejeshgn.com
GPG ID : 0xBFFC8DD3C06DD6B0
On Aug 3, 2014 10:15 PM,
"Sharad Lele"
<[email protected]> wrote:
Dear Dilip and others:
I have been following
this thread with
interest, but to be
honest am a bit lost now.
Can someone post a
summary of which maps
mentioned so far have
what features (which
coverage, pertaining to
which year, what
attributes (such as
census codes), etc.)?
Would be most helpful.
Sharad
On Friday, August 1, 2014
9:03:58 PM UTC+5:30,
Dilip Damle wrote:
Hello,
This is an old post.
However this is the
appropriate place to
add an additional
source.
I had downloaded the
set from Grid Geneva
many years ago.
The original complete
source was named as
GNV197 which is 24 MB
Titled as "HUMAN
POPULATION AND
ADMINISTRATIVE
BOUNDARIES DATABASE
FOR ASIA"
I am attaching the
South Central Asia
E00 file.
That set contains The
disputed areas under
the country name IN1
and IN2
This dataset can not
be easily found at
present on the GRID
Geneva site
http://www.grid.unep.ch/index.php?lang=en
<http://www.grid.unep.ch/index.php?lang=en>
in the same name.
may be it is still
there somewhere with
some other name.
For copyright check
the metadata file
which is here
http://geonetwork.grid.unep.ch/geonetwork/srv/en/iso19139.xml?id=835
<http://geonetwork.grid.unep.ch/geonetwork/srv/en/iso19139.xml?id=835>
rgds
Dilip Damle
On Wednesday, January
4, 2012 9:52:57 AM
UTC+5:30, Karthik
Shashidhar wrote:
All the
shapefiles for
India that I have
downloaded do not
show PoK and
Aksai Chin as
part of India.
Does anyone here
have access to
shapefiles that
include these
territories?
Basically looking
to publish
(online) some
maps, so want to
make sure that
it's accurate.
(I looked through
the group
archives, and all
sources mentioned
there do not show
these regions as
part of India)
Thanks
Karthik
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