Hi,
As a result of the articles I have read in detail, I would like to ask a few questions and await the help of those involved.
First of all, I focused on the thesis of estimating categorical soil classes (USDA, soil taxonomy, from ordo to subgroup and series ) with 22 environmental variables.
In this context, I will represent 11 remote sensing data, 11 topographic data and topography, parent material and organism factors that are mostly studied in the literature( SCORPAN model).
I focused mostly on the Multinominal Logistic regression used. I continue my R programming and R studio training for this method.
Specifically "Spatial prediction of USDA‐great soil groups in the arid Zarand region, Iran: comparing logistic regression approaches to predict diagnostic horizons and soil types. European Journal of Soil Science, 63(2), 284-298. https://doi.org/10.1111/j.1365-2389.2012.01425.x " I read the article in detail and similar to the following articles;
''Jeune, W., Francelino, M. R., Souza, E. D., Fernandes Filho, E. I., & Rocha, G. C. (2018). Multinomial logistic regression and random forest classifiers in digital mapping of soil classes in western Haiti. Revista Brasileira de Ciência do Solo, 42. https://doi.org/10.1590/18069657rbcs20170133''
''Kempen, B., Brus, D. J., Heuvelink, G. B., & Stoorvogel, J. J. (2009). Updating the 1: 50,000 Dutch soil map using legacy soil data: A multinomial logistic regression approach. Geoderma, 151(3-4), 311-326. https://doi.org/10.1016/j.geoderma.2009.04.023''
''Piccini, C., Marchetti, A., Rivieccio, R., & Napoli, R. (2019). Multinomial logistic regression with soil diagnostic features and land surface parameters for soil mapping of Latium (Central Italy). Geoderma, 352, 385-394. https://doi.org/10.1016/j.geoderma.2018.09.037''
''Abdel-Kader, F. H. (2011). Digital soil mapping at pilot sites in the northwest coast of Egypt: A multinomial logistic regression approach. The Egyptian Journal of Remote Sensing and Space Science, 14(1), 29-40. https://doi.org/10.1016/j.ejrs.2011.04.001''
''Afshar, F. A., Ayoubi, S., & Jafari, A. (2018). The extrapolation of soil great groups using multinomial logistic regression at regional scale in arid regions of Iran. Geoderma, 315, 36-48. https://doi.org/10.1016/j.geoderma.2017.11.030''
''Pahlavan-Rad, M. R., Khormali, F., Toomanian, N., Brungard, C. W., Kiani, F., Komaki, C. B., & Bogaert, P. (2016). Legacy soil maps as a covariate in digital soil mapping: a case study from Northern Iran. Geoderma, 279, 141-148.''
My question;
- I have a total of 5 Ordos, 6 sub-Ordos, 8 large groups, 8 sub-groups and 20 series. How do I transfer environmental variable data from these fields to R Studio with coordinate information ? I want to inform you that I have the knowledge to produce environmental variables here.
- Should I extract this data on a point basis or on a polygon basis ? How do I import it into R studio ?
R studio for Udemy, Coursera etc. I keep training from places.
I expect very valuable information from you. It's a little hard at first, but I know that nothing is easy in life. I will learn! I think I can learn faster with your advice.
Hello Fuat,
SP and/or SF packages both are capable of assigning coordinates to a data.frame of points, they may find you an answer, and if not they will help you to formulate a a set of data.frames with coordinates and sub-levels and you can also import shape files with several geometry types with them
Dear Jamhiri,
Thank you for your valuable information. In the png that I added, '' The values of terrain attributes, the remote sensing indices and levels of geomorpholgy map were then converted into a table for all the point locations with the observed soil horizon and USDA great soil groups '' expression.
Malone, B. P., Minasny, B., & McBratney, A. B. (2017). Using R for digital soil mapping. Basel, Switzerland: Springer International Publishing '', 6.2 Multinomial Logistic Regression.
In that,
library (ithir) (A collection of functions and algorithms specific to pedometrics)
library (sp) (Your suggestion)
library (raster)
The main part of the data file that I find difficult to understand. I need to see sample files about it. my source is attached.
"http://smartdigiag.com/DSM_book /" from the site Malone et al., I found the R scripts of the study belonging to (Malone et al., 2014), and found in trials on my own data, My hope of going forward is even greater.
However, I would like to ask you what a few functions might mean, while again stating that I am lacking in basic information.
extract: DSM_data
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