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Posts Tagged ‘data’

Looking for data and data repositories? Check out re3data.org!

During my search for a suitable repository for publishing data and code of our potato trade network analysis, @hauschke and @pampel pointed me to re3data.org.

Re3data.org is a global registry of data repositories with the mission to

present repositories for the permanent storage and access of data sets to researchers, funding bodies, publishers and scholarly institutions. In the course of this mission re3data.org aims to promote a culture of sharing, increased access and better visibility of research data.

Currently, re3data.org contains over 600 data repositories which are accessible either by browsing through the catalogue or via a search facility. A really useful resource!

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Really a Nontraded Commodity? – Datasets and code now available

05/12/2013 4 comments

Figure 1: Trade network for fresh potatoes.The most successful contribution to this blog is (a little to my own surprise) our analysis of the international potato trade network Really a Nontraded Commodity?

For all those who are interested in what’s behind that work, or who want to take the analysis further, or simply want to know how these graphs have been produced we have now made the matrices of bilateral trade in fresh, frozen, and seed potatoes as well as the R code publicly available.

All data comes with a Creative Commons license and is openly accessible at the zenodo repository.

(Thanks, zenodo, for this great service!)

Crop model calibration with yield trial data: Dealing with missing weather data

06/09/2013 1 comment

One of our tasks in the Global Futures project was to calibrate potato cultivars in the DSSAT-SUBSTOR potato crop model with field trial data requested from CIP breeders. A common problem with the use of that kind of data was that weather data was missing. In most cases, only maximum and minimum temperature, as well as rainfall measured during the cropping season are available. The crop model, however, in addition requires solar radiation data. Furthermore, in order to carry out simulations with different planting or harvest dates, data which goes beyond the original cropping period is needed.

The approach we took to obtain a complete set of weather data that can be used with the crop model rests upon data provided by the NASA Langley Research Center POWER Project funded through the NASA Earth Science Directorate Applied Science Program. It consists of the following steps:
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