Tamarix ssp. maps

SAN LUIS REY WATERSHED: EXOTIC PLANT DISTRIBUTION MAPS

Mapping was carried out by the WMA. Funding provided by the San Luis Rey Watershed Council.

Surveying was completed between February and June 2000. Future updates will be carried out and noted when they occur. Exotic plant mapping was carried out in the field by delineating areas with target exotic plants on orthocorrected aerial photographs (3 foot resolution 1998 infra-red images, SANDAG). Acreages should be viewed as representative of the level of infestation, but should not be used as a definitive acreage, e.g. for mitigation purposes. More accurate mapping using a ground-based GPS unit would be suggested. The field survey is probably within 20% to 30% of the true acreage and is therefore useful in planning eradication efforts. The entire watershed has been surveyed, but some small infestations may have been missed.

GIS Coverages:

Covers the entire San Luis Rey watershed (from Oceanside to above Henshaw Dam), including the main river channel and tributaries.

Coordinate System: United States State Plane 1983
Zone: California Zone6 0406
Datum: NAD83
Coordinate Units: Feet

DOWNLOAD an ArcView GIS Shape file compressed with WinZip (right-click the link and select "Save Target As"):

• Coverages for non-native plants, including: tamarisk (salt cedar), German ivy (Delairea odorata), periwinkle (Vinca major), artichoke thistle (Cynara cardunculus), and tree of heaven (Ailanthus).

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Other coverages available in the State Plane coordinate system (roads, rivers, streams, etc) can be downloaded from the SANDAG Website.