ASRIS Technical Specifications V1.6

Table 1: Complementary benefits of mapping (contained within ASRIS), monitoring andmodelling ............................................................................................................................................................ 6Table 2: The main soil properties included in ASRIS and their significance ....................................................... 8Table 3: The spatial hierarchy of land-unit tracts (after Speight 1988). Note that the databasedesign for ASRIS allows intermediate Levels to be characterized (e.g. a System with acharacteristic dimension significantly less that 100 m would be designated as Level 5.1 or 5.2in the hierarchy) ............................................................................................................................................... 12Table 4: Default estimates of uncertainty for attributes of land-unit tracts in ASRIS – defaultsfor landform and land surface (relief, modal slope, element, pattern, microrelief, rockoutcrop and surface coarse fragments) are yet to be determined. ................................................................. 18Table 5: Summary of descriptors for tracts at Level 1 (land province) ............................................................ 20Table 6: Summary of descriptors for tracts at Level 2 (land region) ................................................................ 22Table 7: Level-5 land-unit tract identifiers ....................................................................................................... 25Table 8: Nature of observations for the land-unit tract ................................................................................... 26Table 9: Orders of survey (modified from Soil Survey Staff (1993, p48–49)) .................................................. 26Table 10: Relief and modal slope classes ......................................................................................................... 27Table 11: Codes for landform pattern .............................................................................................................. 28Table 12: Identifiers for tracts at level-6 .......................................................................................................... 29Table 13: Landform morphological type .......................................................................................................... 30Table 14: Drainage classes ................................................................................................................................ 30Table 15: Landform elements (after Speight 2009) ......................................................................................... 31Table 16: Microrelief type ................................................................................................................................ 32Table 17: Described gilgai component (if present) .......................................................................................... 33Table 18: Biotic agent for microrelief (if present) ............................................................................................ 33Table 19: Biotic component of microrelief (if present) .................................................................................... 33Table 20: Representativeness of the most similar soil profile in the ASRIS Soil Profile Database ................... 35Table 21: Estimation method for field texture ................................................................................................. 36Table 22: Estimation method for clay content ................................................................................................. 36Table 23: Field-texture grades, modifiers and qualifiers ................................................................................. 38Table 24: Estimation method for coarse fragments ......................................................................................... 41Table 25: Estimation method for bulk density ................................................................................................. 42Table 26: Estimation method for pH ................................................................................................................ 43Table 27: Estimation method for organic carbon. ........................................................................................... 44Table 28: Estimation method for depths and layer thicknesses ...................................................................... 44Table 29: Type of impeding layer ..................................................................................................................... 45