Rene H.J. Heim

9 Questions 20 Answers 0 Followers

Questions related from Rene H.J. Heim

What are the radiometric correction procedures that are applied in Agisoft Metashape?

Dear RG-Community, I have been using Agisoft Metashape for UAV imagery processing for quite a while now. Also a while ago, I stumbled upon the Micasense GitHub repository and saw that individual...

18 July 2024 8,712 2 View

How to sample maize leaves and transporting them for specific leaf area measurements?

Dear RG community, I would like to sample (cut-off) maize leaves in the field and transport them to the lab for SLA (specific leaf area) measurements. After a brief literature review, I could not...

19 August 2020 6,484 4 View

How to find and extract a homogenous (uniform) area of pixel values in an image?

Dear RG Community, I am currently working with thermal images of natural scenes. Throughout the scene I positioned large artificial targets that are painted black, grey and white. I would like...

13 November 2019 4,030 13 View

How is a GCMS object constructed based on a CDF file?

Dear RG Community, I am currently trying to handle CDF files in R (xcms package). These files contain information that was yielded from a GCMS analysis. I start to understand that the...

04 September 2019 4,687 2 View

Always OOB sampling in R caret package when using random forests?

Dear RG-community, I am curious how exactly the training process for a random forest model works when using the caret package in R. For the training process (trainControl()) we got the option to...

29 May 2018 6,828 4 View

How to handle zero offset in spectral reflectance data?

Dear RG-Community, for my PhD, I asked a drone company to capture multispectral imagery from a lemon myrtle plantation. Based on this imagery I defined different vegetation classes (Treated,...

22 May 2018 7,624 1 View

Does anyone know of a function in R to calculate and plot an interval band for mean spectral responses originating from field spectrometry?

I am working with spectral signatures of vegetation in R. I would like to plot various means of those signatures and add an interval band representing the standard error of the mean for each...

27 February 2017 7,957 0 View

Does a method for simple estimation of leaf surface hydrophobicity/hydrophilicity exist?

G'Day peers, I would like to know if leave surfaces within plant families are rather hydrophilic or hydrophobic. Is anyone aware of a simple method to estimate this? Please ask if further...

13 February 2017 4,327 4 View

When do we need accurate temperature data and when should we use relative values (warmer then/colder then)?

Dear RG community, I am curious to hear your opinion. When we work with thermal imagery (UAV or ground), under what conditions are you more interested in precise temperature values (which would...

01 January 1970 3,788 0 View