search for: evapotranspiration

Dear R users, I'm glad to announce the new version of water package (0.5). As this is my first message to the list, I want to add that this package provides tools to estimate actual evapotranspiration from surface energy balance models. Right now you can run the well-know METRIC model using it. This model allows to estimate the energy balance using landsat (7 or 5) images and a weather station. I'll be happy to discuss or provide more information. Regards, Guillermo. ###################...

Dear R users, I'm glad to announce the new version of water package (0.5). As this is my first message to the list, I want to add that this package provides tools to estimate actual evapotranspiration from surface energy balance models. Right now you can run the well-know METRIC model using it. This model allows to estimate the energy balance using landsat (7 or 5) images and a weather station. I'll be happy to discuss or provide more information. Regards, Guillermo. ###################...

I'd appreciate advice on the following: I've written an R function that uses 3 vectors (temperature, precipitation and potential evapotranspiration) for a given site, calculates a water budget (which implies few (<4) iterations), and, from thresults of this water budget, calculates a number of bioclimatic indices. Now I want to calculate these indices for a large number of sites (arranged as cells in a raster map), using monthly raster ma...

Hi,Has anybody worked with thornthwaite method to calculate the daily evapotranspiration ? I have used the following code to calculate monthly evaporation but what I need is daily evapotranspiration. Epot <- thornthwaite(Tave, lat, na.rm = FALSE) # Evaluates evapotranspiration for each month. Do you have any code which works for daily timestep ? Its more technical question, may be...

Hola eRReros. Os lo explico con un ejemplo: # Cargamos los paquetes y el ejemplo install.packages("SPEI") library("SPEI") data(wichita) # los primeros 12 datos head(wichita,12) # mi subset de los primeros 12 datos meu<-wichita[c(1:12),] meu # como veis los valores de TMED son iguales en ambos dataframes. # ahora viene el problema # calculamos

...of the AI groups to the treatment that I applied for the parameter that I measured. In total I have 24 different populations of a specific tree species. The population refers to the geographical area that I choose to collect seeds from and for every population I know the annual rainfall and annual evapotranspiration. I started with equal replicate number of plants per population per treatment, but some died and some where not healthy enough to include them in the experiment. My design is as follows: - Blocks (6 blocks, those are different days that I planted my plants. Every block at the beginning had a...

...ndard power basis. There's poly.transform in S-plus. Does anybody know how to do that in R ? I've found question about that in the archives of R-help but no real answer. Example : I'm doing polynomial regression of percentage of one insect in a community on altitude, precipitations, evapotranspiration, max and min temperatures using glm. I would like to get the standard coordinates of my polynom in order to draw maps, get the maximum values, etc... Call: glm(formula = Ymat ~ poly(Alt, 2) + poly(Pmm, 2) + poly(E0, 2) + poly(Min, 2) + poly(Max, 2), family = binomial, data = tableau) Devian...

...he past five years is 127.7mm, and the average annual evaporation is 2623mm); on the other hand, serious deteriorated water quality (about 190,000 tons salinity carried by irrigated water from Shiyang River).* *3. **Traditional theory holds that the restoration of vegetation will increase the evapotranspiration, then leading to groundwater decline.* *4. **Let’s set aside the question of how we desalinated the saline water. * * * *Thank you!* * * *Sincerely,* * * *YU* -- ...........................<?}))><..................... ) ) ) ) ) ( ( ( ( ( ) ) ) ) ) ( ( ( ( ( Unangu )...