RELICT ICE-WEDGE POLYGONS

Svensson, Harald, 1976; Relict ice-wedge polygons revealed on aerial photographs from Kaltenkirchen, northern Germany. Geografisk Tidsskrift 75: 8–12. København, juni 1, 1976.

On aerial photographs polygonal patterns are detected in cultivated fields due to vegetational contrasts. In a section through the ground the structure and composition of the material were studied. The outline of the ice-wedge cast is very faint, hut the existing structure and soil qualities are sufficient to make the polygonal network show on the ground surface. The season of the year and the external conditions at the time of photographing are of great importance for a distinct reproduction of the pattern in the aerial photograph.