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...- ReadGrib("C:/Users/admin/Downloads/Met.grib") # Convert to a data frame grib_df <- as.data.frame(grib_data) # Write the data frame to a CSV file write.csv(grib_df, file = "output.csv") I would be more than happy if anyone could help me. Sincerely -- Best Regards Javad Bayat M.Sc. Environment Engineering Alternative Mail: bayat194 at yahoo.com

Dear Bert and Sara; I have searched on the internet and found some way to do this like python. But python is so complicated to me as it needs many steps to be done for reading and converting it. I will try terra package to convert it. On Tue, 25 Jun 2024, 15:15 javad bayat, <j.bayat194 at gmail.com> wrote: > Richard, > Many thanks for your email. > I had attached the grib file to the original email to R help team but it > seems you did not receive it. > Unfortunately, I do not know how to reduce the volume or extract some of > the grib file d...

...le for > myself. Does the licence for the data even allow you to send some of > it in a message? Which parameters are you extracting? When you say > "it didn't work", what actually happened? Which step went wrong and how? > > > On Tue, 25 Jun 2024 at 20:33, javad bayat <j.bayat194 at gmail.com> wrote: > > > > Dear all; > > I have downloaded meteorology data from " > > > https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-single-levels?tab=form > " > > as .grib format. It has hourly data of a compl...

...be irrelevant, but if the lake is cylindrical == constant cross sectional area at all depths, then height doubles when the volume does and vice versa. Otherwise you have to know how area varies with height or use more sensible approximations thereto. Cheers, Bert On Tue, Dec 5, 2023, 20:13 javad bayat <j.bayat194 at gmail.com> wrote: > Dear all; > I am trying to calculate the volume of a polygon shapefile according to a > DEM raster. I have provided some codes at the end of this email.I dont know > if the codes are correct or not. Following this, I have another question >...

...t;Base.tif") p <- shapefile("p.shp") r <- crop(r, p) r <- mask(r, p) x <- exact_extract(r, p, coverage_area = TRUE) x1 = as.data.frame(x[1]) head(x1) x1 = na.omit(x1) x1$Height = max(x1[,1]) - x1[,1] x1$Vol = x1[,2] * x1[,3] sum(x1$Vol) " -- Best Regards Javad Bayat M.Sc. Environment Engineering Alternative Mail: bayat194 at yahoo.com [[alternative HTML version deleted]]

...very much part of the R "way". Or there's gribr https://rdrr.io/github/nawendt/gribr/man/gribr.html which wraps ecCodes in R. I still don't understand what "doesn't work" means. Which step goes wrong and how does it misbehave? On Wed, 26 Jun 2024 at 06:02, javad bayat <j.bayat194 at gmail.com> wrote: > > Richard, > Many thanks for your email. > I had attached the grib file to the original email to R help team but it seems you did not receive it. > Unfortunately, I do not know how to reduce the volume or extract some of the grib file data to...

...nowledge of the reservoir shape. E.g. in a cylindrical > reservoir halving the water level also halves the volume, but in a conical > reservoir, halving the level leaves only 1/8 of the volume. > > > > -pd > > > > > > > >> On 8 Apr 2024, at 05:55 , javad bayat <j.bayat194 at gmail.com> wrote: > >> > >> Dear all; > >> Many thanks for your replies. This was not homework. I apologize. > >> Let me explain more. > >> There is a dam constructed in a valley with the highest elevation of > 1255 > >>...

...lready mentioned, this is a great topic for R-sig-geo, where you'd probably get specialist answers like the lake morphology package https://cran.r-project.org/web/packages/lakemorpho/index.html which is explicitly designed for this kind of question. Sarah On Tue, Dec 5, 2023 at 11:13?PM javad bayat <j.bayat194 at gmail.com> wrote: > > Dear all; > I am trying to calculate the volume of a polygon shapefile according to a > DEM raster. I have provided some codes at the end of this email.I dont know > if the codes are correct or not. Following this, I have another question &...

Attachments CAN NOT be sent to group On Thu, 26 Sep 2024, 21:22 javad bayat, <j.bayat194 at gmail.com> wrote: > Dear Roy, > Sorry for my mistake, I thought I have uploaded the grib file. > I really apologise for that. I will send it on Saturday. > Thank you very much. > > On Thu, 26 Sept 2024, 17:40 Roy Mendelssohn - NOAA Federal, < > roy.m...

..."Layer" and the "LU" are two different columns of the dataframe. How can I fix this? Sincerely for (i in 1:nrow(data2$Layer)){ if (data2$Layer == "Level 12") { data2$LU == "Park" } } -- Best Regards Javad Bayat M.Sc. Environment Engineering Alternative Mail: bayat194 at yahoo.com [[alternative HTML version deleted]]

...e: > Hi Javad: > > I know a lot about reading GRIB files, I work with them all the time. > But if you don?t make the file available, or point me to where I can > download it, there is not much I can do. > > Thanks, > > -Roy > > On Sep 25, 2024, at 9:41?PM, javad bayat <j.bayat194 at gmail.com> wrote: > > Dear all; > Many thanks for your responses. Actually it is not completely a GIS file, > it is a data file which stores meteorological data of a specific region. > But the site allows downloading with grib format and as I searched to read &gt...

...ground and to the side and pour in if the level lowers or can be used to escape if the level rises. -----Original Message----- From: R-help <r-help-bounces at r-project.org> On Behalf Of Sorkin, John Sent: Sunday, April 7, 2024 3:08 PM To: Rui Barradas <ruipbarradas at sapo.pt>; javad bayat <j.bayat194 at gmail.com>; R-help <R-help at r-project.org> Subject: Re: [R] Question regarding reservoir volume and water level Aside from the fact that the original question might well be a class exercise (or homework), the question is unanswerable given the data given by the origina...

...ta2$LU[which(data2$Layer == c("Level 1","Level 2", "Level 3", ...))] <- c("Park", "Agri", "GS", ...) Sincerely On Sun, Jun 11, 2023 at 1:43?PM Rui Barradas <ruipbarradas at sapo.pt> wrote: > ?s 21:05 de 11/06/2023, javad bayat escreveu: > > Dear R users; > > I am trying to fill a column based on a specific value in another column > of > > a dataframe, but it seems there is a problem with the codes! > > The "Layer" and the "LU" are two different columns of the dataframe. >...

...ot;. > Or there's gribr https://rdrr.io/github/nawendt/gribr/man/gribr.html > which wraps ecCodes in R. > > I still don't understand what "doesn't work" means. Which step goes > wrong and how does it misbehave? > > > On Wed, 26 Jun 2024 at 06:02, javad bayat <j.bayat194 at gmail.com> wrote: > > > > Richard, > > Many thanks for your email. > > I had attached the grib file to the original email to R help team but it seems you did not receive it. > > Unfortunately, I do not know how to reduce the volume or extract some...

...olume are impossible to answer without knowledge of the reservoir shape. E.g. in a cylindrical reservoir halving the water level also halves the volume, but in a conical reservoir, halving the level leaves only 1/8 of the volume. > > -pd > > > >> On 8 Apr 2024, at 05:55 , javad bayat <j.bayat194 at gmail.com> wrote: >> >> Dear all; >> Many thanks for your replies. This was not homework. I apologize. >> Let me explain more. >> There is a dam constructed in a valley with the highest elevation of 1255 >> m. The area of its reservoir can be...

...ant 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 at yahoo.com [[alternative HTML version deleted]]

...e Care, 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 Cell phone 443-418-5382 ________________________________________ From: R-help <r-help-bounces at r-project.org> on behalf of Rui Barradas <ruipbarradas at sapo.pt> Sent: Sunday, April 7, 2024 10:53 AM To: javad bayat; R-help Subject: Re: [R] Question regarding reservoir volume and water level ?s 13:27 de 07/04/2024, javad bayat escreveu: > Dear all; > I have a question about the water level of a reservoir, when the volume > changed or doubled. > There is a DEM file with the highest elevation 1267 m...

Hi Javad: I know a lot about reading GRIB files, I work with them all the time. But if you don?t make the file available, or point me to where I can download it, there is not much I can do. Thanks, -Roy > On Sep 25, 2024, at 9:41?PM, javad bayat <j.bayat194 at gmail.com> wrote: > > Dear all; > Many thanks for your responses. Actually it is not completely a GIS file, it is a data file which stores meteorological data of a specific region. But the site allows downloading with grib format and as I searched to read this type of...

Dear R users I am trying to find a formula to calculate the angle of a polyline. Is there a way to do this? Many thanks. -- Best Regards Javad Bayat M.Sc. Environment Engineering Alternative Mail: bayat194 at yahoo.com [[alternative HTML version deleted]]

...0 m. Now I want to know what would be the water level if the volume rises to 1250 m? or what would be the water level if the volume doubled (14,000,000 m3)? Is there any way to write codes to do this in R? I would be more than happy if anyone could help me. Sincerely -- Best Regards Javad Bayat M.Sc. Environment Engineering Alternative Mail: bayat194 at yahoo.com [[alternative HTML version deleted]]