If I use Surface Reflectance data of Landsat, do the constants of Vegetation Index (e.g, Advanced Vegetation Index) change?

The formula of Advanced Vegatation Index for Landsat 7 is: AVI = [(B4 + 1) (256 - B3) (B4 - B3)] ^ 1/3 and for Landsat 8, AVI = [(B5 + 1) (65536 - B4) (B5 - B4)] ^ 1/3 Now if I transform the DN...

11 December 2017 8,488 6 View

How to calculate Advanced Vegetation Index(AVI) on Landsat 8?

I couldn't find the formula to calculate Advanced Vegetation Index of Landsat 8 products. I know the formula of AVI using Landsat 7. How do I calculate AVI for Landsat 8 Reflectance Data?

10 November 2017 5,106 9 View

Can we obtain Bottom of Atmosphere Reflectance from Landsat? If we can, How?

I know we can get Top of Atmosphere Reflectance from Landsat. But can we get Bottom of Atmosphere Reflectance data from image? If possible, how to do the process?

08 September 2017 629 2 View

What things should I consider if I want to use Landsat-5 and Landsat-8 Images for comparing Disturbance Index?

I want to perform Tasseled cap transformation on Landsat 5 and Landsat 8 Images to get forest Disturbance Index. And I want to compare the forest Disturbance of Different Years ( before 2011 by...

08 September 2017 3,254 3 View

How to measure Canopy Coverage of a square plot using GRS Densiometer or Spherical Densiometer?

My field sample plots are 30x30m square and I have to measure canopy coverage along with other field data. Ho can I use GRS densiometer or Spherical densiometer to measure the canopy coverage of...

03 April 2017 8,805 3 View

Is it possible to detect forest disturbance in temporal scale with a baseline data of present year?

I want to detect the natural disturbance of a subtropical hill forest(Bangladesh) using Landsat imagery. I can have the field data/baseline data of present time only. But I also want to detect the...

02 March 2017 2,338 6 View

How can I detect forest disturbance from Landsat image?

10 November 2016 5,294 11 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

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

Guidelines for survey (question type) analysis?

Hi. Please tell me what guidelines should i need to follow for questionaries' type research work in India. It is not hospital based work, we are conduction basic institutional based qualitative...

03 March 2021 2,037 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

Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence?

I am on the lookout for the Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence. Does anyone know where I can find it? Thank you in advance

03 March 2021 3,568 1 View

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Hi, I want to start testing pitfall trap to obtain ants samples, but I need to conduct molecular analysis on those insects. So, what kind of fluid can I use? Ethanol expires too early and I need...

03 March 2021 5,978 5 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