Hi David, This is in response to your second question about the projection the shapes are in. This might help to find out: http://projfinder.com/ Have to start with identifying a spot in the shapefile that you can recognise and locate on a real map. Center the map in the website there, and key in the co-ords for that spot in the shapefile. The website then gives you a listing of most likely projections.
We used that tool here: https://github.com/draftmpd41/layers_draft_delhi_master_plan_2041 -- Cheers, Nikhil VJ https://nikhilvj.co.in On Tue, Oct 26, 2021 at 1:09 AM David Sorge <worr...@gmail.com> wrote: > Thanks so much for sharing this! Three quick questions: > > 1) Do you have the link within the ECI website? > I'd love to be able to link back to it, check for additional metadata, > etc. Unfortunately, ECI is a pretty difficult website to navigate (for me > at least -- maybe I just need to learn how to use it better.) > > 2) Do you know what projection the files are in? > I'd like to transform it so it fits with data in a Kalianpur 1975/India > Zone IIa Projection, but to get it there, I need to figure out what > projection the data starts in. Were there any clues about this on the site > where the files originated? > > 3) Is there a well-known fix for the Uttarakhand issue? > I was able to do a quick and imprecise fix in python using geopandas and > shapely: > > ``` > import pandas as pd > import geopandas as gpd > from shapely.affinity import translate > > AC_path = Path('geocoding/AC_Data/States') > gdfs = [] > for file in AC_path.glob('*/*.shp'): > gdf = gpd.read_file(file) > gdfs.append(gdf) > > AC_data = pd.concat(gdfs) > mask = AC_data.ST_CODE == 'S28' > > AC_data.loc[mask, 'geometry'] = \ > AC_data[AC_data.ST_CODE == 'S28'].geometry \ > .apply(lambda geom: > translate(geom, xoff=-14.3468, yoff=0.1394)) > ``` > > However, this results in only an approximate fix, with some boundary > problems as shown in the plot here. The fact that Uttarkhand looks just a > bit small for the space probably has to do with issues with the projection. > > > > This fix will work well enough for my purposes, I think, but I'd be > interested to know about another solution if one exists. > > Thanks so much! > > David > > > On Friday, October 30, 2015 at 2:47:20 AM UTC-4 cadv wrote: > The predetermination data was available fro download from the Election > commission website itself. > I had kept it safely. > > Here it is. There is a known problem about the placement of Uttarakhand in > one of the sets. > > > On Wednesday, October 28, 2015 at 11:43:58 AM UTC+5:30, Chandrashekhar > Raman wrote: > does anyone have access to pre-delimitation assembly constituency > shapefiles of Bihar.. i.e 2005 backwards. much appreciate if can be shared. > > thanks > cs > > > On Friday, October 30, 2015 at 2:47:20 AM UTC-4 cadv...@gmail.com wrote: > >> The predetermination data was available fro download from the Election >> commission website itself. >> I had kept it safely. >> >> Here it is. There is a known problem about the placement of Uttarakhand >> in one of the sets. >> >> >> On Wednesday, October 28, 2015 at 11:43:58 AM UTC+5:30, Chandrashekhar >> Raman wrote: >>> >>> does anyone have access to pre-delimitation assembly constituency >>> shapefiles of Bihar.. i.e 2005 backwards. much appreciate if can be shared. >>> >>> thanks >>> cs >>> >> -- > 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. > To view this discussion on the web visit > https://groups.google.com/d/msgid/datameet/ab6e8db6-2c9f-43ab-a83f-583c820eb983n%40googlegroups.com > <https://groups.google.com/d/msgid/datameet/ab6e8db6-2c9f-43ab-a83f-583c820eb983n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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. To view this discussion on the web visit https://groups.google.com/d/msgid/datameet/CAH7jeuMmO%2BpOSD89C5PSoNMX%2BCoEgCLatOtd4V7itdPKKC2qBg%40mail.gmail.com.
