Dear Justin:
I beg to disagree. For Karnataka, which I know best, GADM has 176
features. Census 2001 shows 175 talukas. Census 2011 has 176 unique
taluka codes.
Second, boundaries in Karnataka of GADM are okay: i am comparing them
with taluka boundaries I have digitzed from Census handbook itself.
Sharad
On 06-Aug-14 11:42 PM, Justin Meyers wrote:
Sharad,
<https://lh5.googleusercontent.com/-45mYgnZbcC0/U-Ju6KmGRCI/AAAAAAAAAKQ/FNF491-pg_0/s1600/gadm.jpg>
GADM is junk. The person who created it doesn't respond to e-mails.
I reached out to him (Dr. Robert Hijmans) a few years back and he was
useless. Currently GADM has 2299 coundaries. See a pic of the two
layers compared (GADM is Green, this dataset is red)
Justin
On Wednesday, August 6, 2014 1:58:20 PM UTC-4, Sharad Lele wrote:
How does this compare with the maps from the GADM database?
My notes say GADM database maps (India state, district and taluka)
show district boundaries of 2001 or earlier, with spatial
positioning error of about 1km, and much more generalized than the
boundaries shown on Survey of India toposheets. (goes without
saying since the topos are at much finer scale than such maps)
Sharad
On Wednesday, August 6, 2014 10:49:42 AM UTC+5:30, Dilip Damle wrote:
Justin, Devdatta,
It's all about how things work in India,
Devdatta mentioned SWEat,blood and teARS
It also includes the capitalised word :)
Good to persevere though.
Congratulatioins.
Rgds
Dilip Damle
On Wednesday, August 6, 2014 9:59:13 AM UTC+5:30, Justin
Meyers wrote:
<https://lh5.googleusercontent.com/-R0Y80NzLfCo/U-GuxQ7iCwI/AAAAAAAAAKA/gdN3wX4skFk/s1600/bihar_sample.jpg>
see the Bihar data compared to this:Red=Bihar Black=this
dataset
On Wednesday, August 6, 2014 12:21:27 AM UTC-4, Justin
Meyers wrote:
Devdatta,
This is raw data that I converted from kml to shp. So
it took me about 30 minutes to make sure the
attributes came through properly. Cannot say my
source until I download the rest of the content from
the site, before they take it down. It seems like
they put data on the internet, then try to take it
down (or hide it...). Not really sure why? I posted
the Orissa sample for you some time ago, but you never
responded? I found official data for Orissa as well,
so converting the census pdfs to gis is a big waste of
time (took me a few days...).
As per the quality of this dataset, it is the best I
have seen on a national level. But if you look state
by state, or really want quality data, then this isn't
what you want. I would call this dataset a rough start.
I posted a update about Bihar
(https://groups.google.com/forum/#!topic/datameet/QuP4Tt4n0_g
<https://groups.google.com/forum/#%21topic/datameet/QuP4Tt4n0_g>)
and that data is amazing, this data doesn't hold a
candle to it. Too bad the government doesn't want
help from the experts ;)
Cheers,
Justin
On Wednesday, August 6, 2014 12:02:57 AM UTC-4,
Devdatta Tengshe wrote:
Hi Justin,
Firstly let me congratulate you on doing this. I'm
sure that this must have involved a lot of sweat,
blood and tears (Working with government data,
usually involves the last one). This is the most
up-to-date, comprehensive & complete dataset for
sub districts that I have seen.
Could you tell us what was the source for creating
these boundaries?
I'll cross check it with other datasets, and let
you know how it goes.
Regards,
Devdatta
On Wed, Aug 6, 2014 at 8:06 AM, Justin Meyers
<[email protected]> wrote:
<https://lh5.googleusercontent.com/-JCJJdFxwIJ4/U-GSaLtnplI/AAAAAAAAAJw/3nhGoIFzCNE/s1600/indiatahsil2001.jpg>
https://app.box.com/s/vljeiolbqhx2hwyz8qxs
<https://app.box.com/s/vljeiolbqhx2hwyz8qxs>
Processed from a kml; did not edit any
geometry or attributes. Data is pretty
generalized, but it is a good start for a
national dataset. I keep finding better data
as I continue to look (already posted two
previous versions of a taluk/ tahsil/ amin 3
boundary). After concerns to missing data,
this is the best to date I have found.
Cheers!
Justin
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