[R] Extracting wind direction and wind speed from wind rose plot

[@vi@e@gross m@iii@g oii gm@ii@com]

I am curious what you mean by "having a graph."

If you mean something drawn on paper or an image on your screen, then
extracting specific data at various points is an effort, perhaps more so if
a wind rose plot does not contain all you need. If you have something like a
ggplot2 object, it tends to contain lots of saved info inside you can
access, albeit it may not be by the hour.

Is there a library that does that?

Either way, others have pointed out ways to combine two sets of data if they
already match or with a suitable join method. There are quite a few packages
that can be used to massage your data, once you have valid data, into that
form but you may need to meet some constraints and make some decisions.

I hesitate to point out that a data frame with hourly intervals over five
years is 24*365*5 rows and would require somehow reading one or more such
plots  to generate nearly 44K observations. 

-----Original Message-----
From: R-help <r-help-bounces using r-project.org> On Behalf Of javad bayat
Sent: Wednesday, October 30, 2024 6:48 AM
To: R-help <R-help using r-project.org>
Subject: [R] Extracting wind direction and wind speed from wind rose plot

Dear all;
I am searching for a way to extract wind direction and speed from a wind
rose plot. I have a graph and I want to make a dataframe of 5 years with
hourly intervals.

> start_date <- as.POSIXct("2019-01-01 00:00:00")
> end_date <- as.POSIXct("2023-12-31 23:00:00")
> time_sequence <- seq(from = start_date, to = end_date, by = "hour")

> df <- data.frame(
  year = as.integer(format(time_sequence, "%Y")),
  month = as.integer(format(time_sequence, "%m")),
  day = as.integer(format(time_sequence, "%d")),
  hour = as.integer(format(time_sequence, "%H"))
)

> head(df)
  year month day hour
1 2019     1   1    0
2 2019     1   1    1
3 2019     1   1    2
4 2019     1   1    3
5 2019     1   1    4
6 2019     1   1    5


And I want to add 2 more cols to this dataframe as Wind_Dir and Wind_Speed
that the data extracted from the plot by analyzing it.
Is there any library to do this? or any function to write for this purpose?
I would be more than happy if you please help me to do this.
Sincerely







-- 
Best Regards
Javad Bayat
M.Sc. Environment Engineering
Alternative Mail: bayat194 using yahoo.com

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