[R] how to plot gridded data

[lily li]

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 using 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 using r-project.org> On Behalf Of lily li
> > Sent: Wednesday, September 12, 2018 8:55 AM
> > To: R mailing list <r-help using 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]]
> >
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