Seafloor character--Offshore of Fort Ross, California

This part of DS 781 presents the seafloor-character map Offshore of Fort Ross, California (raster data file is included in "SeafloorCharacter_OffshoreFortRoss.zip," which is accessible from http://pubs.usgs.gov/ds/781/OffshoreFortRoss/data_catalog_OffshoreFortRoss.html).

This raster-format seafloor-character map shows four substrate classes offshore of Fort Ross, California. The substrate classes mapped in this area have been further divided into the following California Marine Life Protection Act depth zones and slope classes: Depth Zone 2 (intertidal to 30 m), Depth Zone 3 (30 to 100 m), Slope Class 1 (0 degrees - 5 degrees), and Slope Class 2 (5 degrees - 30 degrees). Depth Zone 1 (intertidal), Depth Zone 4 (100 to 200 m), Depth Zone 5 (greater than 200 m), and Slopes Classes 3-4 (greater than 30 degrees) are not present in the region covered by this block. The map is created using a supervised classification method described by Cochrane (2008), available at http://doc.nprb.org/web/research/research%20pubs/615_habitat_mapping_workshop/Individual%20Chapters%20High-Res/Ch13%20Cochrane.pdf.

References Cited:

California Department of Fish and Game, 2008, California Marine Life Protection Act master plan for marine protected areas; Revised draft: California Department of Fish and Game, accessed April 5 2011, at http://www.dfg.ca.gov/mlpa/masterplan.asp.

Cochrane, G.R., 2008, Video-supervised classification of sonar data for mapping seafloor habitat, in Reynolds, J.R., and Greene, H.G., eds., Marine habitat mapping technology for Alaska: Fairbanks, University of Alaska, Alaska Sea Grant College Program, p. 185-194, accessed April 5, 2011, at http://doc.nprb.org/web/research/research%20pubs/615_habitat_mapping_workshop/Individual%20Chapters%20High-Res/Ch13%20Cochrane.pdf.

Sappington, J.M., Longshore, K.M., and Thompson, D.B., 2007, Quantifying landscape ruggedness for animal habitat analysis--A case study using bighorn sheep in the Mojave Desert: Journal of Wildlife Management, v. 71, p. 1419-1426.

本数据集DS 781的此部分展示了加利福尼亚州罗斯堡（Fort Ross）近海的海底特征图（seafloor-character map），其栅格数据（raster data）文件包含于"SeafloorCharacter_OffshoreFortRoss.zip"压缩包中，可通过http://pubs.usgs.gov/ds/781/OffshoreFortRoss/data_catalog_OffshoreFortRoss.html获取。

本栅格格式海底特征图标注了加利福尼亚州罗斯堡近海的四类底质类型。本区域绘制的底质分类已进一步划分为《加州海洋生物保护法》（California Marine Life Protection Act）规定的深度带与坡度等级：深度带2（潮间带至30米）、深度带3（30米至100米）、坡度等级1（0°~5°）以及坡度等级2（5°~30°）。深度带1（潮间带）、深度带4（100米至200米）、深度带5（200米以上）以及坡度等级3~4（30°以上）在本次制图覆盖的区域内均未出现。本图采用Cochrane（2008）提出的监督分类（supervised classification）方法制作，相关技术文档可通过http://doc.nprb.org/web/research/research%20pubs/615_habitat_mapping_workshop/Individual%20Chapters%20High-Res/Ch13%20Cochrane.pdf查阅。

引用文献：
1. 加州鱼类与野生动物部（California Department of Fish and Game），2008年，《加州海洋保护区海洋生物保护法总体规划》（修订草案）：加州鱼类与野生动物部，2011年4月5日访问，网址http://www.dfg.ca.gov/mlpa/masterplan.asp。
2. Cochrane, G.R.，2008年，《用于海底栖息地制图的声呐数据视频监督分类》，收录于Reynolds, J.R.与Greene, H.G.主编的《阿拉斯加海洋栖息地制图技术》：费尔班克斯，阿拉斯加大学，阿拉斯加海洋赠地学院项目，第185-194页，2011年4月5日访问，网址http://doc.nprb.org/web/research/research%20pubs/615_habitat_mapping_workshop/Individual%20Chapters%20High-Res/Ch13%20Cochrane.pdf。
3. Sappington, J.M.、Longshore, K.M.与Thompson, D.B.，2007年，《量化动物栖息地分析的地形粗糙度——以莫哈韦沙漠大角羊为例》：《野生动物管理杂志》，第71卷，第1419-1426页。