ASPECT OF SLOPES

For a better understanding of these transformations, the cartographic model can be displayed in a new window.

For simplicity reasons, the following intermediate steps are displayed only for study area 82.

Aspect of slopes derived from DEM:

Reclassification of treeline82_reclass in order to make treeline "transparent" for overlay with aspect:

Overlay, so only the aspect of treeline pixels is retained:

Reclassification into 4 groups: North, East, South, and West:

Extracting each of the 4 aspects into separate images by reclassifying it in 4 different ways:

Overlay with DEM, resulting in 4 different images of treeline elevation for treelines at north-, east-, south-, and west-facing slopes:

Histogram analysis of treeline elevation depending on aspect:

Histograms for study area 92:

Average elevation of treeline in m depending on aspect and study area:

	study area 82: Rocky Mtns	study area 92: Coast Mtns
north	2084	1700
east	2143	1798
south	2193	1898
west	2176	1833

CONCLUSION:

In both study areas the same pattern is evident: treeline elevation is highest on south-facing slopes, followed by west-facing, then east-facing slopes, and is lowest on north-facing slopes.

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