Water in Karst area is broken and the characteristics of vegetation and water body overlapping put forward a new type of mixed water index of the regional water resources management and evaluation plays an important role. The Puzhehei's Landsat8 OLI is based on the data of image data, building a new hybrid NEWI water index. Results show that the new water body index NEWI extracting effect is better than that of NDWI and MNDWI, especially vegetation breakage lakes contain pits and water area, NEWI calculated 25.3% degree of differentiation of water body and shadow, is greater than the NDWI (17.9%) and MNDWI (15.6%). Water's overall recognition accuracy is 88.83%, the Kappa coefficient 0.76 is greater than the NDWI (87.10%, Kappa coefficient 0.74) and MNDWI (81.93%, Kappa coefficient 0.64). NEWI water was used by the remote sensing image enhancement method, it can not only effectively extract the open water of the water body information, the edge is clear and reliable. For broken waters, NEWI water extract the highest precision, and compared with the classification of extraction process, based on the theory of the complex mathematical operation is relatively simple, easy to promote, can well improve Karst fractured zone, the accuracy of extraction and water drainage system for real-time monitoring.
Key words
karst area /
broken waters /
remote sensing information extraction /
NEWI /
Puzhehei
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