Download daily weather data
Scillieri, John wrote:
Looks like you can sign up to get XML feed data from Weather.com http://www.weather.com/services/xmloap.html
... and use the excellent R package XML by Duncan Temple Lang to parse the document and easily access the data with, e.g.., XPath rather than regular expressions. vQ
Hope it works out! -----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of James Muller Sent: Thursday, February 26, 2009 3:57 PM To: r-help at r-project.org Subject: Re: [R] Download daily weather data Thomas, Have a look at the source code for the webpage (ctrl-u in firefox, don't know in internet explorer, etc.). That is what you'd have to parse in order to get the forecast from this page. Typically when I parse webpages such as this I use regular expressions to do so (and I would never downplay the usefulness of regular expressions, but they take a little getting used to). There are two parts to the task: find patterns that allow you to pull out the datum/data you're after; and then write a program to pull it/them out. Also, of course, download the webpage (but that's no issue). I bet you'd be able to find a comma separated value (CSV) file containing the weather report somewhere, which would probably involve a little less labor in order to produce your automatic wardrobe advice. James On Thu, Feb 26, 2009 at 3:47 PM, Thomas Levine <thomas.levine at gmail.com> wrote:
I'm writing a program that will tell me whether I should wear a coat, so I'd like to be able to download daily weather forecasts and daily reports of recent past weather conditions. The NOAA has very promising tabular forecasts (http://forecast.weather.gov/MapClick.php?CityName=Ithaca&state=NY&site=BGM&textField1=42.4422&textField2=-76.5002&e=0&FcstType=digital), but I can't figure out how to import them. Someone must have needed to do this before. Suggestions? Thomas Levine!
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