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 <devda...@tengshe.in> > 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 <sharad.l...@gmail.com> >> 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" <shara...@gmail.com> 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 >>>>>>>>>> >>>>>>>>> -- >>>>>>>> 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+u...@googlegroups.com. >>>>>>>> For more options, visit https://groups.google.com/d/optout. >>>>>>>> >>>>>>> -- >>> 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. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> > -- > Datameet is a community of Data Science enthusiasts in India. 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