2018-2019 / GEOL0097-2

Geostatistics

Duration

30h Th, 30h Labo.

Number of credits

 Master in geology and mining engineering, professional focus in geometallurgy (EMERALD) (Erasmus mundus)5 crédits 
 Master in geology and mining engineering (120 ECTS)5 crédits 

Lecturer

Eric Pirard

Coordinator

N...

Language(s) of instruction

English language

Organisation and examination

Teaching in the first semester, review in January

Schedule

Schedule online

Units courses prerequisite and corequisite

Prerequisite or corequisite units are presented within each program

Learning unit contents

1. Computers and Geosciences
2. Statistical terminology and data typology
3. Principles of geological monitoring and spatial sampling
4. Exploratory Data Analysis
Univariate Visualisation (histograms, box plot)
Univariate analysis (percentiles, mean, variance,...)
Identification of outliers
Principles of data levelling
Bivariate Visualisation (scatterplots)
Bivariate Analysis (covariance, correlation,...)
5. Spatial Exploratory Data Analysis
Terminology an Notations
Data posting
Local Analysis - Moving window
Declustering
Spatial Correlation Analysis
The experimental variogram
Variogram Modeling
6. General principles of spatial modeling
Probabilistic vs. Deterministic Modelling
Validation of a model
Spatial deterministic inference

7.  Introduction to regionalized variables
Random variable, random function and regionalized variable
Joint random variables
The covariance and variogram function
Stationarity
The theoretical and the experimental variogram   8. Kriging
The kriging problem
Ordinary Kriging equations
An intuitive look at ordinary kriging weights
Spatial contuinity model influence on kriging weight
Properties of the kriging estimate
Simple kriging
Kriging with trend
9. Change of support and block kriging
Importance of the support on statistics
Effect of the support on estimates
Affine and indirect lognormal corrections
Total variance and variance within block
Block kriging
10. Estimation with secondary data
Secondary information
Kriging within strata
Kriging with local varying mean
Kriging with external drift
Cross-covariance and cross-variogram
Co-kriging
11. Uncertainty of the estimation
Cross-validation
Uncertainty of the local estimate
Confidence interval
Multi-Gaussian approach
Indicator kriging
12. Simulations
Kriging limitations
Simulations and spatial uncertainty
Sequential simulation algorithm
Sequential Gaussian simulations
Sequential Indicator simulations

Learning outcomes of the learning unit

1) To present the main geostatistical inference tools (advantages and drawbacks)
2) To acquire a good mastership of the most utilised concepts
3) To provide the basis for understanding the most advanced papers on spatial inference
4) To learn about the most common professional geostatistical applications

Prerequisite knowledge and skills

Probability and Statistics (basic course)

Planned learning activities and teaching methods

All partical sessions will be organized using programming in  MATLAB, PYTHON and SGEMS.

Mode of delivery (face-to-face ; distance-learning)

2h theory followed by 2h of supervised (or non-) practice

Recommended or required readings

Copy of all PPT used for teaching.
Main reference : Goovaerts P., 1997, Geostatistics for natural resources estimation, Oxford Univ. Press
Recommended Lectures : Isaaks E. & Srivastava M., 1989, Introduction to applied geostatistics, Oxford Univ. Press Cressie N., 1993, Statistics for Spatial Data, Wiley

Assessment methods and criteria

Evaluation will bear on a personal project performed by the student and an oral examination.
Each student will receive a set of data and will habe to characterize and spatial model the data set with the tools seen during the course.
The written work will be submitted before the oral examination and will be subject to additional questions/oral presentation during the exam.
The oral examination will bear on the theoretical principles. The final notation will be a weighted average : 75% (oral examination) + 25% (personal work). None of these two notes being inferior to 8/20. If the oral examination is < 10/20 only this last note will be taken into account.

Work placement(s)

Organizational remarks

Full English

Contacts

Mlle Nadia ELGARA Secrétariat GeMMe Bât B52 Tél. : 366.37.99 nelgara@ulg.ac.be