Mapping and typification of agricultural crop overwetting based on ultra-high spatial resolution satellite images

The research aimed to map, classify and evaluate agricultural field overwetting plots and their features using ultra-high spatial resolution satellite images. The object of the research is overwetting plots located within the agricultural fields of Menkovsky branch of Agrophysical Research Institute, Gatchina district of Leningrad region. Study included a field survey of such an overwetting plots, analysis and evaluation of their interpretation characteristics on satellite images. Overall results are as follows. A set of high spatial resolution satellite images mainly taken in early spring and autumn is needed to detect overwetting plots of agricultural field. The visible overwetting plots interpretation characteristics on satellite images are divided depending on time of the year they made into two groups: high contrast counters with signs of water accumulation – in early spring and counters with signs of depressed vegetation – in vegetation period. The overwetting plots contours interpretation characteristics on satellite images have temporary or permanent type; as a result of the field survey it was established that overwetting plots with permanent type of contour have a shape of basin, depth of 36 cm and more and area of at least 0.1 ha. Mapping of the drainage pipes placed inside overwetting plots contour is required to clarify the probable cause of their origin. The presence of the high contrast point or area close to main drainage pipe within the boundaries of overwetting plots contour on satellite images may indicate a malfunction of the closed collector in the specified location or further down its route. Taking into account the melioration tasks, the key classification features of overwetting plots on satellite images are: presence of main drainage pipe within the boundaries of overwetting plots contour and the stability of such contours over time. The evaluation results of the surveyed overwetting plot characteristics on satellite images are as follows: relief forms and probable depth – 86%; the clarifying of the main drainage pipe malfunction as a cause of overwetting plots origin – 50%.

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