[R] how to plot gridded data

[lily li]

I think it may be feasible to transform the dataset DF, so that the column
names lat_lon can be a surface, where the values locate at each surface.
But I don't know how to transform DF.

On Fri, Sep 14, 2018 at 10:02 AM, lily li <chocold12 using gmail.com> wrote:

> 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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