File Geodatabase Feature Class
Tags
San Clemente Island, California Department of Water Resources, California Department of Fish and Wildlife, National Vegetation Classification Standard, NVCS, Manual of California Vegetation
SDSU, SPAWAR, and USN developed and tested an approach based on hierarchical object-based classification with a rule-based expert system to effectively map vegetation communities on San Clemente Island following the Manual of California Vegetation classification system. This mapping approach closely resembles the process that human image interpreters use to identify species, identify stands with homogeneous species composition, estimate percent cover, and work through a mapping ruleset to assign the correct community type. The primary imagery source was a 4-band aerial multispectral orthoimage dataset, acquired in November 2015, having a high spatial resolution of 0.15 m. In addition, they used products derived from other recent orthoimagery and lidar datasets.
The first of two objectives for the study was to develop and test efficient and effective methods for semi-automated vegetation mapping of the recovering plant communities on SCI, specifically using hierarchical object-based classification with a rule-based expert system, ultra-high spatial resolution (UHSR) multispectral imagery, and lidar-derived digital canopy height data.A secondobjective was to map the distribution and quantify the cover of vegetation alliances over the entirety of SCI.
The final vegetation map portrays the distribution of 19 vegetation communities across SCI, with the largest areas comprised of California Annual and Perennial Grassland (35 percent) and three types of coastal sage scrub and maritime succulent scrub, comprising a combined 53 percent of the area. Map accuracy was assessed to be 79 percent based on fuzzy methods and 61 percent with a traditional accuracy assessment. The accuracy of tree identification was assessed to be 81 percent, but species-level tree accuracy was 45 percent.
This map was created by Kellie A. Uyeda, Kelsey K. Warkentin and Rachel A. Snavely. This project was funded under agreement (Cooperative Agreement Award No: W9126G-15-2-0034) by the U.S. Army Corps of Engineers. It was prepared for publication in BIOS by the California Department of Fish and Wildlifes (CDFW) Vegetation Classification and Mapping Program (VegCAMP).
CDFWs VegCAMP appreciates learning how these vegetation datasets are being used so that we can leverage support for classifying and mapping new areas and let users know of any updates. Please contact us at VegCAMP@wildlife.ca.gov or email any of the staff listed here: https://wildlife.ca.gov/Data/VegCAMP .
License: This work is licensed under Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ ). Using the citation standards recommended for BIOS datasets ( https://www.wildlife.ca.gov/Data/BIOS/Citing-BIOS ) satisfies the attribution requirements of this license.
Disclaimer: The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data.
Extent
| West | -118.612098 | East | -118.343815 |
| North | 33.038150 | South | 32.798509 |
| Maximum (zoomed in) | 1:5,000 |
| Minimum (zoomed out) | 1:150,000,000 |
CDFWs VegCAMP appreciates learning how these vegetation datasets are being used so that we can leverage support for classifying and mapping new areas and let users know of any updates. Please contact us at VegCAMP@wildlife.ca.gov or email any of the staff listed here: https://wildlife.ca.gov/Data/VegCAMP .
License: This work is licensed under Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ ). Using the citation standards recommended for BIOS datasets ( https://www.wildlife.ca.gov/Data/BIOS/Citing-BIOS ) satisfies the attribution requirements of this license.
Disclaimer: The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data.
Study area boundary:
San Clemente Island, California, USA
Minimum Mapping Unit (MMU):
The smallest size areal unit delineated on the map, or minimum mapping unit (MMU), varied by category. For most categories, an MMU of 0.25 hectares (ha) was used, but areas of special interest were mapped with finer MMUs, as shown in Table 1 of the report.