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Skalsky, Rastislav; Tarasovicová, Zuzana; Balkovic, Juraj; Schmid, Erwin; Fuchs, Michael; Moltchanova, Elena; Kindermann, Georg; Scholtz, Peter; McCallum, Ian (2012): Global Homogeneous Response Units. PANGAEA,

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The concept of homogenous response units (HRU) was designed as a general concept for the delineation of basic spatial units. Only those characteristics of landscape, which are relatively stable over time (even under climate change) and largely unsusceptible to anthropogenic influence, were selected. The HRU can be seen as a basic spatial framework for the implementation of climate change and land management alternative scenarios into global modeling and therefore is a basic input for delineation of landscape units. HRUs are defined based on classifications of altitude (five classes: 1 (0 - 300m), 2 (300 - 600m), 3 (600 - 1100m), 4 (1100 - 2500m), 5 (> 2500m)), slope (seven classes(degrees): 1 (0 - 3), 2 (3 - 6), 3 (6 - 10), 4 (10 - 15), 5 (15 - 30), 6 (30 - 50), 7 (> 50)) and soil composition (five classes: 1 (sandy), 2 (loamy), 3 (clay), 4 (stony), 5 (peat)). e.g. HRU111 refers to Altitude class 1: 0-300m; Slope class 1: 0-3 degrees; and Soil class 1: sandy. Areas of non-soil are assigned 88. HRUs have a spatial resolution of approximately 10 km**2.
Related to:
Havlik, Petr; Schneider, Uwe A; Schmid, Erwin; Böttcher, Hannes; Fritz, Steffen; Skalsky, Rastislav; Aoki, Kentaro; De Cara, Stéphane; Kindermann, Georg; Kraxner, Florian; Leduc, Sylvain; McCallum, Ian; Mosnier, Aline; Sauer, Timm; Obersteiner, Michael (2011): Global land-use implications of first and second generation biofuel targets. Energy Policy, 39(10), 5690-5702,
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