Viewshed analysis in R: any package available?

I am wondering if there is any package in R containing function(s) to perform viewshed analysis. I am not interested in packages that need the underlying presence of ArcGIS or GRASS; I am looking...

01 February 2018 9,947 4 View

How to locate in GIS large pits or depressions deeper than the surrounding ground by a given value?

As per title, I was wondering how in a DEM (i.e., a bare-earth DEM) one can locate depressions that are deeper than the surrounding ground by at least a given value. The main issue is that, quite...

09 October 2017 5,232 9 View

How to interpolate wind direction in GIS using transformation?

Hello. I have a point shapefile representing the location of weather stations; for each point, the wind speed and wind direction (in degrees) is recorded. I need to create a cotninous surface...

03 April 2017 653 9 View

How to meaningfully incorporate wind direction into the calculation of least-cost paths for navigation (ArcGIS)?

02 March 2017 4,112 3 View

Slope in degree or percent when implementing Tobler's hiking function in GIS?

Hello All, as per title, I am rather confused as to using slope raster in degree or percent when implementing Tobler function in GIS. Some sources (A, B, C) seem to point to slope degree, while...

31 December 2016 346 23 View

Any available worked example for QGIS r.walk module?

11 December 2016 7,368 5 View

How we can calculate the average leverage when one predictor is categorical?

In Logistic Regression (as in regression in general), when it comes to check model's diagnostics, one has to check for observations with higher-than-average leverage. From what I read in several...

08 September 2016 2,689 3 View

Does anyone know about possible function of ceramic disks from prehistoric contexts?

I was wondering if anyone has ever come across ceramic disks from prehistoric contexts, huts in particular. By ceramic disks I mean sherds from pots' wall, reworked in such a way to eventually...

04 May 2016 9,132 26 View

Does anyone know any free tools to rectify images?

I have a aerial photo which is slightly oblique. I would like to use a free program capable to rectify images; this should be a preliminary step toward georeferencing the picture. Many months ago,...

02 March 2016 8,821 7 View

'cvAUC' R package: how do I format input data?

Hello, I was wondering if anyone could shed light on an issue I am experiencing with the package cvAUC (link provided below). I wish to get the function cvAUC to work, yet I am not getting the...

11 December 2015 4,699 4 View

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

flexibility of polymers chain

effect of double bond on the flexibility of polymers

07 April 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

Formulation of polymer color flakes

I am writing to request some information for making polymer color flakes. I would appreciate the help.

17 March 2021 0 0 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

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View

Irradiation data for JAPAN?

Hi, Could you help me to get the latest (2019, 2020) solar resource data for a particular site in JAPAN? PV GIS and NSRDB data are not in reach to JAPAN, I'm looking for some other database for...

03 March 2021 961 3 View

What is the production process of CaFe ferroalloys?

I looking for ferro calcium production process

03 March 2021 1,755 4 View