Seafloor character, 2-m-resolution grid--Offshore Monterey map area, California

This part of DS 781 presents the seafloor-character map of Offshore of Monterey map area, California. The raster data file is included in "SeafloorCharacter_2m_OffshoreMonterey.zip," which is accessible from http://dx.doi.org/10.5066/F7F47M6T.
This raster-format seafloor-character map shows four substrate classes in the Offshore of Monterey map area, California. The substrate classes mapped in this area have been colored to indicate which of the following California Marine Life Protection Act depth zones and slope classes they belong: Depth Zone 2 (intertidal to 30 m), Depth Zone 3 (30 to 100 m), Depth Zone 4 (100 to 200 m), Depth Zone 5 (deeper than 200 m), Slope Class 1 (0 degrees - 5 degrees; flat), and Slope Class 2 (5 degrees - 30 degrees; sloping). Depth Zone 1 (intertidal), and Slopes Classes 3 and 4 (greater than 30 degrees) are not present in this map area. The map is created using a supervised classification method described by Cochrane (2008), using multibeam echosounder (MBES) bathymetry and backscatter data collected and processed between 1998 and 2014.
Bathymetry data were collected at two different resolutions: at 2-m resolution, down to approximately 90-m water depth (1998-2012 CSUMB and MBARI data); and at 5-m resolution, in the deeper areas (1998-2012 MBARI data). The final resolution of the seafloor-character map is determined by the resolution of both the backscatter and bathymetry datasets; therefore, separate seafloor-character maps were generated to retain the maximum resolution of the source data.
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DS 781数据集包含美国加利福尼亚州蒙特雷近海制图区的海底特征图。栅格数据文件存储于"SeafloorCharacter_2m_OffshoreMonterey.zip"压缩包中，可通过http://dx.doi.org/10.5066/F7F47M6T获取。

本栅格格式海底特征图展示了加利福尼亚州蒙特雷近海制图区内的4种底质类型。区内绘制的底质类型通过色彩编码，以标识其所属的以下《加州海洋生物保护法（California Marine Life Protection Act）》深度分区与坡度分级：深度分区2（潮间带至30米）、深度分区3（30米至100米）、深度分区4（100米至200米）、深度分区5（200米以深）；坡度分级1（0°~5°，平缓）、坡度分级2（5°~30°，倾斜）。深度分区1（潮间带）以及坡度分级3、4（坡度大于30°）未在本制图区内出现。本图采用Cochrane（2008）提出的监督分类方法制作，所用多波束测深仪（multibeam echosounder, MBES）水深地形数据与反向散射数据的采集处理时间范围为1998年至2014年。

水深地形数据采用两种不同分辨率采集：水深约90米以浅区域采用2米分辨率（1998-2012年CSUMB与MBARI采集数据）；深水区采用5米分辨率（1998-2012年MBARI采集数据）。海底特征图的最终分辨率由反向散射数据与水深地形数据集的分辨率共同决定，因此本数据集生成了多幅海底特征图以保留源数据的最高分辨率。

参考文献：
1. 加州鱼类与野生动物局（California Department of Fish and Game），2008年，《海洋保护区加州海洋生物保护法总体规划（修订草案）》；加州鱼类与野生动物局，2011年4月5日访问，http://www.dfg.ca.gov/mlpa/masterplan.asp。
2. Cochrane, G.R.，2008年，《用于海底生境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《阿拉斯加海洋生境制图技术》：费尔班克斯，阿拉斯加大学，阿拉斯加海洋资助大学项目，第185-194页，2011年4月5日访问，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，《用于动物生境分析的地形粗糙度量化——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。