Author archives: Tor-G. Vagen

R seminar series - part 6

Last update on March 12, 2015.

Sixth seminar of "R brown-bag seminars" was held in ICRAF today.  Leigh Winowiecki (PhD, Soil Scientist, CIAT) presented  "Introduction to ggplot"  topic. Presentation of today's seminar is available here.

Data used in this seminar is available here and source code from seminar 6 is shown below:


#Leigh Winowiecki
#ICRAF Training March 12, 2015
#load ...

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Field sampling on Mt Elgon, Uganda

Last update on March 6, 2015.

Field sampling on Mt Elgon, Uganda

The field team from the ICRAF GeoScience Lab led by John Maina and Clement Okia (ICRAF Uganda) has completed the first of two Land Degradation Surveillance Framework (LDSF) sites on Mt Elgon in Uganda, as part of the project "Filling knowledge gaps on the restoration of degraded smallholder landscape mosaics". See slides below to get ...

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R seminar series - part 5

Last update on March 6, 2015.

After a one-week break, our brown-bag seminar series resumed again. In seminar 5, Antony Ndungu presented a number of different R graphing functions. Complete source code for the 5th seminar is available below, while the data used in the exercises can be found here

NB! From next week, we will looking at the wonderful ggplot2 ...

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R seminar series - part 3 & 4

Last update on Feb. 22, 2015.

The third and fourth R brown-bag seminars were held on 12th and 19th of February, respectively. Both seminars covered "Introduction to R". 

Complete source code for both seminars is available at this link, while the data used in the exercises can be found here.

In fifth seminar (5th of March), Anthony Ndungu (a.ndungu@cgiar ...

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Aerial images from Kenya georeferenced by the ICRAF GeoScience Lab

Last update on Feb. 11, 2015.

Aerial images from Kenya georeferenced by the ICRAF GeoScience Lab

During the "Kenya Landuse Change" project conducted by the Climate Change Unit at ICRAF, several thousand aerial images were collected from surveys done in 1983 and 2012, respectively. During the last three months, the ICRAF GeoScience Lab has georeferenced this image archive to an accuracy of ~5m or better, with the help of six interns ...

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R seminar series - part 2

Last update on Feb. 11, 2015.

Second seminar of "R seminar series" was held in ICRAF, Anthony Ndungu (andungu@cgiar.org) from Research Method Group (RMG) presented "Introduction to R". He also demonstrated RStudio Integrated Development Environment (IDE) and few examples. 

Presentation for this seminar is available at this link. Complete source code for each example is available at this link ...

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R user community @ ICRAF

Last update on Jan. 29, 2015.

R user community @ ICRAF

The ICRAF GeoScience Lab and Research Methods Group are launching a weekly brown-bag seminar series at ICRAF. The two main objectives of the seminars are to:

  • establish a R community of practice at ICRAF
  • stimulate sharing of experiences and knowledge
  • stimulate reproducible research

This space (http://landscapeportal.org/blog/categories/R) will be used to ...

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Explore data from our network of LDSF sites in the Sentinel Landscapes

Last update on Aug. 5, 2014.

Explore data from our network of LDSF sites in the Sentinel Landscapes

We are in the process of developing an interactive online mapping and analytical platform, and have just released a test version for the Sentinel Landscapes initiative. Click here to run the application in a new window in your browser. You can also view the sites on the Landscapes Portal here.

Mapping the source of soil erosion

Last update on May 21, 2014.

Mapping the source of soil erosion

Predicting soil erosion

Conventional soil erosion models are generally based on the Universal Soil Loss Equation (USLE), or a revised (RUSLE) or modified (Williams and Berndt (1977)) version of the USLE. Betrie et al (2011) used the Soil and Water Assessment Tool (SWAT), which uses MUSLE to compute soil erosion, to model sediment transport in ...

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Add geotagged photos to your map

Last update on May 8, 2014.

Add geotagged photos to your map

Adding geotagged photos to your map can be a powerful way to visualize the landscape that you are mapping, or even as a way to validate your mapping outputs. In the Landscapes Portal you can do this in three simple steps when creating a new map or when editing one of the existing maps on ...

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