Find country code from city name

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Dion Theunissen
Dion Theunissen 2022-8-10
评论： dpb 2022-8-10
Is there a function available or method to figure out in which country the city is.
I have a column table with a lot of cities and need to complete it with the country name.
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Stephen23
Stephen23 2022-8-10
"I also have street adresses, numbers and postalcodes"
I guess the city name and street and postcode are likely to narrow it down to a particular country. But there is no chance that all of your data are formatted exactly the same format as any database that you will download, so most likely you will have to use an online search engine or service.
dpb
dpb 2022-8-10
I found it pretty trival exercise to create a lookup engine for a downloaded database to which to simply pass the ZIP code to...of course, online databases change/are updated, but if one doesn't have highspeed connection and the data aren't all that dynamic, the static database works pretty well.
I've used it successfully with our local community college student applications database to fill in missing data -- it fails on the rarest of occasion with a missing entry;
>> numel(unique(tZipInfo.Country))
ans =
62
>> height(tZipInfo.Country)
ans =
42724
>>
shows it has 62 unique countries and some 42,000 locations. I'm sure there are many more possible; just how exotic OP's search list is will determine just how sophisticated his lookup will have to be.

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回答（2 个）

dpb
dpb 2022-8-10
Postal codes helps for many countries, yes...although there are some that either don't have or don't use one, if all your addresses include one, you've got at least a chance.
While not the most sophisticated thing, I've built the following routine from a downloaded database I found online -- right now I don't recall which one, specifically, I used...
function [city county state country]=ziplocation(Z)
%ZIPLOCATION returns physical location of ZIP code
% USAGE:
% [city,county,state,country]=ziplocation(ZIP)
load zipDatabaseTable.mat
tmp=repmat({''},size(Z));
[lia,ib]=ismember(Z,tZipInfo.ZIP);
ib=ib(find(ib));
city=tmp; city(lia)=tZipInfo.City(ib);
county=tmp; county(lia)=tZipInfo.County(ib);
state=tmp; state(lia)=tZipInfo.State(ib);
country=tmp;country(lia)=tZipInfo.Country(ib);
end
Steven Lord
Steven Lord 2022-8-10
As far as I'm aware there's no function in MATLAB to map address information to country information, but if there is a web resource that you can use to determine this information you could use some of the basic web services functionality to query those resources. If those tools are not sufficient, there are some more advanced tools available as well.

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