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Lisa Cronjäger untersucht entlang einer aus dem 19. Jahrhundert stammenden forstwissenschaftlichen Taxationskarte von Claës Wilhelm Gyldén, auf welche Weise Zukunft als kartografische Projektion entworfen wird. Das Ziel von Gyldén, den Holzertrag eines Waldes prognostisch zu regulieren, wird hierbei über diagrammatische und kalkulatorische Berechnungs- und Darstellungsverfahren erst möglich gemacht. Die Imagination einer genauen Planbarkeit von Ressourcennutzung, kartografische Genauigkeit und die Unterdrückung von (subalternen) Waldnutzungspraktiken bedingen sich in dieser Konstellation gegenseitig.
Artificial drainage of agricultural land, for example with ditches or drainage tubes, is used to avoid water logging and to manage high groundwater tables. Among other impacts it influences the nutrient balances by increasing leaching losses and by decreasing denitrification. To simulate terrestrial transport of nitrogen on the global scale, a digital global map of artificially drained agricultural areas was developed. The map depicts the percentage of each 5’ by 5’ grid cell that is equipped for artificial drainage. Information on artificial drainage in countries or sub-national units was mainly derived from international inventories. Distribution to grid cells was based, for most countries, on the "Global Croplands Dataset" of Ramankutty et al. (1998) and the "Digital Global Map of Irrigation Areas" of Siebert et al. (2005). For some European countries the CORINE land cover dataset was used instead of the both datasets mentioned above. Maps with outlines of artificially drained areas were available for 6 countries. The global drainage area on the map is 167 Mio hectares. For only 11 out of the 116 countries with information on artificial drainage areas, sub-national information could be taken into account. Due to this coarse spatial resolution of the data sources, we recommended to use the map of artificially drained areas only for continental to global scale assessments. This documentation describes the dataset, the data sources and the map generation, and it discusses the data uncertainty.