MONITORING WETLAND HABITAT RESTORATION IN SOUTHERN CALIFORNIA USING AIRBORNE MULTISPECTRAL VIDEO DATA

Remote sensing provides a complementary approach to field sampling to assess whether restored wetland areas provide suitable habitat for the Light-footed Clapper Rail (Rallus longirostris levipes). Habitat requ irements for the clapper rail are specified by the composition of vege tation species and their spatial extent in its nesting home range. A m ajor saltmarsh construction project has been completed at the Sweetwat er Marsh National Wildlife Refuge (''the refuge''), San Diego County. In this paper we describe the application of image classification tech niques to high-spatial-resolution digital video imagery (0.8-m pixels) to delimit patches of different marsh vegetation at the refuge. Using maps of vegetation types derived from multispectral imagery, we estim ated the area occupied by each vegetation type in potential clapper mi l home ranges. Preliminary field-checking results indicate that this a pproach is an accurate, noninvasive and cost-efficient means of provid ing ecological information for restoration monitoring in southern Cali fornia's remnant wetlands.