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]
<mailto:[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] <mailto:[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
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
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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