TP11902: Vegetation cover map for 1967 for Watershed 1 The accuracy of the aerial photo interpretation was assessed through comparison of the percent cover maps against the plot cover measurements. Some differences were expected between the mapped cover percentages and the plot measurement, because of the difference in the resolution of the mapped areas and the 2x2m plot size. The mapped areas were drawn with an expectation that there was significant heterogeneity in the vegetation cover within each map unit. These results are presented in Appendix B of thesis.
The 1972 herbaceous cover map agreed with the plot data for 45 plots, and in general overestimated herbaceous cover. The 1972 conifer and evergreen broadleaf cover map agreed with the plot data for 31 plots, and in general overestimated conifer and evergreen broadleaf cover. The 1972 deciduous broadleaf cover map agreed with the plot data for 58 plots, and in general underestimated deciduous cover. The 1979 conifer and evergreen broadleaf cover map agreed with the plot data for 35 plots, and in general overestimated conifer and evergreen broadleaf cover. The 1979 deciduous broadleaf cover map agreed with the plot data for 44 plots, and in general underestimated deciduous cover. The 1990 herbaceous cover map agreed with the plot data for 27 plots, and in general overestimated herbaceous cover. The 1990 evergreen broadleaf cover map agreed with the plot data for 18 plots, and in general overestimated evergreen broadleaf cover. The 1990 conifer cover map agreed with the plot data for 28 plots, and in general overestimated conifer cover. The 1990 deciduous broadleaf cover map agreed with the plot data for 34 plots. These map assessments were not used to adjust the cover map for two reasons. The resolution of the map units was quite a bit larger than the plot size, and there was no discernible spatial pattern in the plot data that could have been used to adjust the cover maps.
