Characterization of small shallow ponds with color video imagery in Central Mexico |
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Authors: | Jorge López-Blanco Luis Zambrano |
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Affiliation: | (1) Instituto de Geografía UNAM, Circuito Exterior, Ciudad Universitaria, A.P. 20-850, C.P. 04510, México D.F.;(2) Departamento de Zoología, Circuito Exterior, Instituto de Biología UNAM, Ciudad Universitaria, A.P. 70-153, C.P. 04510, México D.F. |
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Abstract: | We present a method to evaluate ecological characteristics of small shallow ponds in Central Mexico based on video remote sensing and image processing techniques in a GIS environment. We used a set of color video imagery obtained from heights lower than 700 m above ground. Our analysis established statistical correlations between the average reflectance values contained in video imagery (digital numbers DN per Blue-Green-Red band) and the average values of limnetic variables: (1) water suspended solids concentration; (2) water turbidity; (3) total macrophytes coverage; (4) free floaters and emergent macrophytes coverage; (5) zooplankton abundance; and (6) chlorophyll-a concentration in water. We found strong correlation between DN values and vegetation presence, suspended solids concentration and water turbidity (R= 0.85 to 0.98), but weak correlations with phytoplankton and zooplankton abundance. This cheap and fast method can be used to describe general conditions of ponds related with vegetation abundance, turbidity and suspended solids. |
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Keywords: | shallow lakes video remote sensing macrophytes zooplankton phytoplankton suspended solids water turbidity Acambay Central Mexico |
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