Abstract: This shapefile contains polygons representing the historical
land cover within the watersheds near Fair Haven, New York, on the
southeastern shore of Lake Ontario. These land cover boundaries and
types were interpreted from aerial photos dating from 1973.
Purpose: To evaluate broad changes in land cover over time.
Supplemental_Information: This dataset was developed as part of the Lake Ontario
Biocomplexity Project. For more information, see:
Browse_Graphic_File_Description: preview of the dataset
Completeness_Report: It should be noted that the cover class 14, "farms and land in
farm buildings", is very dependent on the scale of the photos for each
given year. For general analysis this category could be grouped with the
agricultural cover classes if wished. The wetland classes (numbers 10, 11,
and 12) were interpreted by Nicole Hotaling of SUNY ESF for the areas
adjacent to the embayments. The wetland cover class 10, woody wetlands,
was interpreted by the general group for areas within the larger
Horizontal_Positional_Accuracy_Report: It is important to note that the aerial photos used for this
project differed in resolution, scale, and distortion. Therefore the
level of detail within each of the landcover maps varies.
Additionally, due to this distortion the resulting maps do not align
perfectly at boundaries such as shorelines and embayments and even
fixed objects. The project group took as much care as possible to get
good registration, and achieved the best possible without advanced
triangulation and other interpretation techniques that were beyond the
scope of this project. Users of these maps should be aware of these
limitations and use them as general depictions of the land use and
land cover and use them to only evaluate broad changes over time.
Process_Description: Files were created by aligning historical aerial photographs
along flight lines and tracing landcover classes onto clear acetate
overlays. The polygons on the overlays were then digitized into
ArcView GIS in Sibley Hall at Cornell during the Summer of 2003 by our
REU intern, Seth Lozano. Interpretation of the aerial photos was done
by Seth, Andrea Parmenter, and the rest of the summer field interns.
All photos for the project were provided by the Cayuga County Planning
Department in Auburn, NY. Registration of the acetate overlays to real
world coordinates was accomplished by using a series of tic marks
(e.g. road intersections for which we knew the coordinates and could
locate on the photos). In all cases care was taken to minimize the
root mean square (RMS) error, and hence distortion caused by
registration. The RMS values and tic IDs used for each map can be
found in the red airphoto documentation notebook in 306 Rice Hall.
Process_Description: CUGIR staff defined the dataset projection as UTM18N (meters,
NAD27), removed extraneous attributes, and exported the data as a
Distribution_Liability: Cornell University provides these geographic data "as is". Cornell
University makes no guarantee or warranty concerning the accuracy of
information contained in the geographic data. Cornell University further
makes no warranty either expressed or implied, regarding the condition of
the product or its fitness for any particular purpose. The burden for
determining fitness for use lies entirely with the user. Although these
files have been processed successfully on computers at Cornell University,
no warranty is made by Cornell University regarding the use of these data
on any other system, nor does the fact of distribution constitute or imply
any such warranty.