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.

DS 781的本章节展示了加利福尼亚州罗斯堡近海的海底特征图（seafloor-character map），其栅格数据（raster data）文件包含于"SeafloorCharacter_OffshoreFortRoss.zip"中，可从http://pubs.usgs.gov/ds/781/OffshoreFortRoss/data_catalog_OffshoreFortRoss.html获取。

本栅格格式海底特征图呈现了加利福尼亚州罗斯堡近海的四类底质类型（substrate classes）。该区域的底质类型进一步划分为《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至100米）、坡度等级1（0°至5°）以及坡度等级2（5°至30°）。本覆盖区块未包含深度带1（潮间带）、深度带4（100至200米）、深度带5（200米以上）以及坡度等级3-4（坡度大于30°）。本地图采用Cochrane（2008）提出的监督分类法（supervised classification）制作，相关文献可从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，《加州海洋生物保护法》海洋保护区总体规划；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，《声呐数据（sonar data）的视频监督分类用于海底生境制图》，收录于Reynolds, J.R.与Greene, H.G.主编的《阿拉斯加海洋生境制图技术》：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，《量化动物生境分析的地形粗糙度——以莫哈韦沙漠大角羊为例》：《野生动物管理杂志（Journal of Wildlife Management）》，第71卷，第1419-1426页。