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Assessment of remotely sensed and statistical inventories of African agricultural fields
Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology (INK).
2008 (English)In: International Journal of Remote Sensing, ISSN 0143-1161, E-ISSN 1366-5901, International Journal of Remote Sensing, Vol. 29, no 13, 3787-3804 p.Article in journal (Refereed) Published
Abstract [en]

This paper critically examines different sources of remotely sensed and statistical inventories of African agricultural fields. Substantial discrepancies are found across alternative sources of information in both the extent and location of agricultural fields. In one-third of the countries, the difference between lowest and highest field extent estimate exceeds 25% of the total country area, and the maximum difference at the continental level is 2.6 million km2. Much of the disagreement between land-cover maps arises from areas of low cropping density. These inconsistencies have important implications when using these data directly, e.g. for the assessment of land cover changes, or indirectly in economic or physical models, and indicate a need to explicitly quantify uncertainties arising from the limitations in land-cover data. They also highlight the need for development of regional land information systems for baseline development and informed policy decisions.

Place, publisher, year, edition, pages
Informa plc , 2008. Vol. 29, no 13, 3787-3804 p.
National Category
Geosciences, Multidisciplinary
Identifiers
URN: urn:nbn:se:su:diva-24753DOI: 10.1080/01431160801891762ISI: 000257034200007OAI: oai:DiVA.org:su-24753DiVA: diva2:198256
Note
Part of urn:nbn:se:su:diva-7431Available from: 2008-03-17 Created: 2008-03-17 Last updated: 2010-12-21Bibliographically approved
In thesis
1. Making water information relevant on local to global scale – the role of Information Systems for Integrated Water Management
Open this publication in new window or tab >>Making water information relevant on local to global scale – the role of Information Systems for Integrated Water Management
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Relevant information is essential for finding solutions in Integrated Water Management (IWM). Complex water systems and a need for increasing integration of sectors, actors and scales in IWM require new methods for developing and managing such information. This thesis investigates the role of information within the IWM process, as well as the main challenges for development of representative, accessibleand harmonized information. Results show how information needs and the information production process for IWM may be systematized, and indicate a large potential for information system development for IWM. However, in order to reach the full potential, today’s limited and heterogeneous water information needs to become more comprehensive, transparent, interoperable, dynamic, scalable and openly accessible. Large pressures on water systems are found in coastal catchment areas that are unmonitored across the local to the global scale, indicating a large importance of these areas for nutrient and pollutant loading. The globally accessible runoff data from catchment areas that are rich in pressures from population, agriculture and general economic activity further exhibit a rapidly declining trend during recent years. Major water system changes may therefore pass unnoticed if analyzed on the basis of openly accessible runoff global data. Furthermore, large discrepancies are found between land cover databases, which may result in major uncertainties in quantification of water and evapotranspiration flows. Identified information challenges may be relatively easily overcome by making better use of available information, while other challenges such as development of consistent baselines of core data and a possible re-prioritization of water-environmental monitoring programs may be both difficult and costly.

Place, publisher, year, edition, pages
Stockholm: Institutionen för naturgeografi och kvartärgeologi, 2008. 105 p.
Series
Dissertations from the Department of Physical Geography and Quaternary Geology, ISSN 1653-7211
Keyword
Integrated water management, hydrology, environmental information systems, environmental monitoring, land cover, GIS, Sweden, Baltic Sea, European Union, global water, global change, Water Framework Directive
National Category
Physical Geography
Research subject
Physical Geography
Identifiers
urn:nbn:se:su:diva-7431 (URN)978-91-7155-586-1 (ISBN)
Public defence
2008-04-07, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 8 A, Stockholm, 13:00
Opponent
Supervisors
Available from: 2008-03-17 Created: 2008-03-17Bibliographically approved

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