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Neighborhood Analysis-Based Calculation and Analysis of Multi-Scales Relief Amplitude

Abstract. Relief Amplitude is a quantitative index that describes topographic features and reflects the degree of relief amplitude. It is widely used in the field of topographic mapping and resource environment assessment. In the present study, the relief amplitudes in different neighborhood-scale units in east mountainous area of Tibetan Plateau were calculated based on the high space-resolution ASTER GDEM data by calling the Focal Function used for neighborhood analysis by means of AML language program. The results revealed that the size of the unit of neighborhood scale affected crucially the relief amplitude. The value of relief amplitude increased rapidly with increasing area of the statistic unit of neighborhood at first. Whereas when the area of neighborhood-scale unit was close to some threshold value, the increasing rate started to slow down and became stable, and during the process in which the increasing rate started to decline, there was a prominent turning point, namely the optimal unit of neighborhood scale. The optimal unit of neighborhood scale was 5.06km2 based on the significance test of elevation difference. A classification map of relief amplitude was established based on the optimal unit of neighborhood scale and it was found that, in the study area, the relief amplitude increased gradually northwestward-southeastwardly.