R help - Sep 2018 - how to plot gridded data

Hi R users,

I have a question about plotting gridded data. I have the files separately,
but do not know how to combine them. For example, each txt file has daily
precipitation data at a specific grid cell, named pr_lat_lon.txt. How to
plot all txt files for one surface (which is rectangular in this case), or
how to combine the txt files together? Thanks.

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Hi

1. Read files/lines into R ?read.table, ?read.lines
2. Merge files according to your specification ?merge, ?rbind
3. Plot values by suitable command(s) ?plot, ?ggplot
4. If you want more specific answer, please post more specific question,
preferably with concise and clear example.
5. Avoid posting in HTML

Cheers
Petr
> -----Original Message-----
> From: R-help <r-help-bounces at r-project.org> On Behalf Of lily li
> Sent: Wednesday, September 12, 2018 8:55 AM
> To: R mailing list <r-help at r-project.org>
> Subject: [R] how to plot gridded data
>
> Hi R users,
>
> I have a question about plotting gridded data. I have the files separately,
but do
> not know how to combine them. For example, each txt file has daily
> precipitation data at a specific grid cell, named pr_lat_lon.txt. How to
plot all
> txt files for one surface (which is rectangular in this case), or how to
combine
> the txt files together? Thanks.
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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Hi Petr,

I have merged the data using cbind. The dataset is like this:
DF
lat1_lon1  lat1_lon2  lat1_lon3  ...  lat2_lon1
  1.20           1.30          2.11      ...     1.28
  1.50           1.81          3.12      ...     2.34
  2.41           2.22          1.56      ...     2.50
  3.11           4.21          2.12      ...     3.21

The other file is a shapfile, which I can open using readOGR. Then it shows
a polygon according to geographical latitude and longitude in degrees. How
to overlay the values in DF onto the polygon? note that DF has the
coordinates for a rectangular box that includes the shapefile, but is
larger. I don't know how to do this. Thanks for your help.

On Wed, Sep 12, 2018 at 3:22 PM, PIKAL Petr <petr.pikal at precheza.cz>
wrote:
> Hi
>
> 1. Read files/lines into R ?read.table, ?read.lines
> 2. Merge files according to your specification ?merge, ?rbind
> 3. Plot values by suitable command(s) ?plot, ?ggplot
> 4. If you want more specific answer, please post more specific question,
> preferably with concise and clear example.
> 5. Avoid posting in HTML
>
> Cheers
> Petr
>
> > -----Original Message-----
> > From: R-help <r-help-bounces at r-project.org> On Behalf Of lily
li
> > Sent: Wednesday, September 12, 2018 8:55 AM
> > To: R mailing list <r-help at r-project.org>
> > Subject: [R] how to plot gridded data
> >
> > Hi R users,
> >
> > I have a question about plotting gridded data. I have the files
> separately, but do
> > not know how to combine them. For example, each txt file has daily
> > precipitation data at a specific grid cell, named pr_lat_lon.txt. How
to
> plot all
> > txt files for one surface (which is rectangular in this case), or how
to
> combine
> > the txt files together? Thanks.
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide http://www.R-project.org/
> posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> Osobn? ?daje: Informace o zpracov?n? a ochran? osobn?ch ?daj? obchodn?ch
> partner? PRECHEZA a.s. jsou zve?ejn?ny na: https://www.precheza.cz/
> zasady-ochrany-osobnich-udaju/ | Information about processing and
> protection of business partner?s personal data are available on website:
> https://www.precheza.cz/en/personal-data-protection-principles/
> D?v?rnost: Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou
> d?v?rn? a podl?haj? tomuto pr?vn? z?vazn?mu prohl??en? o vylou?en?
> odpov?dnosti: https://www.precheza.cz/01-dovetek/ | This email and any
> documents attached to it may be confidential and are subject to the legally
> binding disclaimer: https://www.precheza.cz/en/01-disclaimer/
>
>
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