How do you define the best (or adequate) spatial resolution to monthly rainfall interpolation?

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

16 June 2021 0 0 View

fatal error

16 June 2021 0 0 View

fatal error

16 June 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View

Mark Brady

Hi. One way to answer this is to investigate spatial autocorrelation between the sites sampled for rainfall. ArcMap has a tool called Incremental Spatial Autocorrelation. Essentially it allows you to find distance bands between sampled points at which autocorrelation is highest. Keeping the spatial resolution of your interpolation below the distance at which spatial autocorrelation is most apparent will give you some confidence that the interpolated values are reasonable. Also if you are using Kriging, ArcMap allows you to create a variance raster that will allow you to see where and by what magnitude your interpolated values differ from sampled values (kriging doesn't preserve data points). Hope this helps.

Gustavo Bastos Lyra

Hi Brady, thank you for your reply. I think this solution will be very helpful. Thank you so much. Best regards

José Carlos Gonzalez-Hidalgo

Did you check the Correlation Decay Distance?, precipitation is highly space variable and I suspect that no universal decisión can be take, and distance at which some value of common varince remain.....could vay from región to región.

Gustavo, what is the spatial densiy of rainfall stations you are dealing?, and how is the orography of área??

Hi José, attached the map with the spatial distribution of the rainfall stations and the orography of region. For the state area (27.768) and stations number (36), the density is one rainfall station for each 771 km².

L. Augusto Sanabria

Hi Gustavo,

The problem of the optimum size for interpolation depends on the characteristics of the data, this is not a trivial problem. A good discussion of the problem can be found in:

Hengl T. (2006). Finding the Right Pixel Size.Computers & Geosciences 32, 1283-1298.

Good luck with your problem.

Cheers,

Augusto

Hi Sanabria,

Thank you so much for your reply and sending the paper about the optimization of grid size.

Best regards

Gustavo

Eduardo Gelcer

Hello Gustavo,

During summer and winter the conditions might be completely different. There is a publication (Dzotsi, 2014 - http://onlinelibrary.wiley.com/doi/10.1002/joc.3904/abstract?userIsAuthenticated=false&deniedAccessCustomisedMessage=) showing how the rainfall varies for each season.

Best

Eduardo