RE: Re: Mathematica 5,6,7 WeatherData, CityData
- To: mathgroup at smc.vnet.net
- Subject: [mg94157] RE: [mg94142] Re: Mathematica 5,6,7 WeatherData, CityData
- From: "Tugrul Temel" <temelt at xs4all.nl>
- Date: Sat, 6 Dec 2008 06:13:40 -0500 (EST)
- References: <gh5nqh$odq$1@smc.vnet.net> <gh8hgg$qt8$1@smc.vnet.net> <200812051204.HAA28302@smc.vnet.net>
Dear All, I also liked the Whether Data option. It is an excellent utility for spatial analysis. But I wonder how I can get, for example, Precipitation Rate for Kenya. Please let me know your input. Regards, Tugrul -----Original Message----- From: Mac [mailto:mwjdavidson at googlemail.com] Sent: Friday, December 05, 2008 1:04 PM To: mathgroup at smc.vnet.net Subject: [mg94157] [mg94142] Re: Mathematica 5,6,7 WeatherData, CityData I'm also very impressed with the possibilities offered by the new weather station function in Mathematica 7.0. The geographical and environmental data functions for Mathematica are growing quickly and valuable (at least to me). My guess is for the city data function that Wolfram is limited by the data source that they are using. It is not clear to me how much Wolfram is actively contributing to filling gaps in the dataset as coordinates for cities can be derived from a number of locations. I've proposed data for some missing cities to them but never got feedback. Out of interest I tried the following functions to determine what percentage of cities in CityData have coordinates. In[61]:= allcities = Flatten[CityData[{All, #}] & /@ CountryData[] , {1, 2}]; In[62]:= allcities // Dimensions Out[62]= {163391, 3} In[63]:= DeleteCases[ CityData[#, "Coordinates"] & /@ allcities, {_Missing, _Missing}] // Dimensions Out[63]= {148733, 2} In short - about 90% (or 148733/163391*100) of cities have coordinates associated with them. Deventer must belong to the 10% without coordinates. Still this is not too bad and certainly a lot of useful data. Mac On Dec 4, 1:13 pm, "sjoerd.c.devr... at gmail.com" <sjoerd.c.devr... at gmail.com> wrote: > You're right here. > > The "Shape" properties of The Netherlands falls woefully short. Ik > looks a bit like a 1930 map or so. The "FullPolygon" data set is > somewhat better, with the large Waddenzee islands present, though one > of the IJsselmeer polders is still missing. > > I suggest you collect your own contour using a google earth bitmap and > mathematica's coordinate picker tool. Shouldn't be too difficult, but > getting lat/longs right might be more complex. > > Deventer has indeed its coordinates missing from the database. > Mathematica does know its population though. Not very satisfactory, I > agree. > > Cheers -- Sjoerd > > On Dec 3, 12:42 pm, P_ter <petervansumme... at gmail.com> wrote:> Hello, > > > I was impressed by an example for Mathematica 7.0, that is, the globe w= it= > > h theweatherstations. So, I wanted to make something like that for the Ne= = > therlands.> First of all, have a look atwww.maps.google.nltocompare that = map with th= > > e map from the CountryData: islands are missing, a famous dike is missing= , = > and a piece of land won from the sea is missing. So making a polygon for = th= > e Netherlands does not work. > > > How to find all theweatherstations in the Netherlands with Mathematica?= = > > There is no method to determine if aweatherstation is in a certain cou= nt= > ry.> It is here that I stumbled also on holes in CityData: CityData[{All,= "Ove= > > rijssel", "Netherlands"}] shows that the city Deventer is in it.> But whe= n I do: CityData[{"Deventer", "Netherlands"}, "Coordinates"], > > I get: {Missing["NotAvailable"], Missing["NotAvailable"]} > > > It means that the missing coordinates make it difficult to combine the = av= > > ailable CityData and WeatherData as to determine if aweatherstation is (n= = > ear a city) in the Netherlands. > > > > > > > > > ?? > > with friendly greetings, > > P_ter
- References:
- Re: Mathematica 5,6,7 WeatherData, CityData
- From: Mac <mwjdavidson@googlemail.com>
- Re: Mathematica 5,6,7 WeatherData, CityData