2015-2019全球海洋地质地球物理数据集

一、自由空间重力异常数据
提交的数据共分两类：一类是从相关网站收集的数据，一类是利用科学号海测数据跟网上收集数据融合后的数据。
网站收集数据：从加利福尼亚圣地亚哥分校Scripps海洋研究所网站（https://topex.ucsd.edu/）收集了分辨率为1′的全球海洋重力异常数据（卫星重力数据）。数据位于重力数据文件夹下的自由空间重力异常数据子文件夹下，数据范围：经度0-359°（0-179°为东经0°到179°，181°--359°为西经179°--西经1°），纬度80.7366°N~80.7367°S。由于整体数据太大，所以按10个经度为一个数据文件进行了拆分，共36个文件，文件名是按经度命名，例如0-9.txt是经度从东经0°到9°，纬度从80.7366°N~80.7367°S（北纬为正值，南纬为负值）的自由空间重力异常数据。每个数据文件的格式为ASCII码形式的XYZ 网格化数据（三列数据分别是经度、纬度、自由空间重力异常值）。
融合后的数据：将科学号2015年、2016年、2017年中科院海洋战略先导科技专项-西太雅浦海山共三个航次的海测重力成果数据（图1），与网站收集重力数据进行了对比融合处理。融合后的数据文件名为融合后数据.txt，也保存在重力数据文件夹下的自由空间重力异常数据子文件夹下。数据范围：经度136-141°E，纬度7-11°N。数据格式也是ASCII码形式的XYZ 网格化数据（三列数据分别是经度、纬度、自由空间重力异常值）。
二、地磁异常数据
提交的数据共分两类：一类是从相关网站收集的数据，一类是科学号海测成果数据。
网站收集数据：从全球地磁数据库（https://www.geomag.us/）收集了分辨率为2′的全球地磁异常数据。这些地磁异常数据来源于卫星测量、航空测量及部分海上测量。共1个文件，文件名为mag.txt。数据位于磁力数据文件夹下。
数据范围：经度-180°~180°（负数为西经，正数为东经），纬度-90°~90°（负数为南纬，正数为北纬）。数据文件的格式为ASCII码形式的XYZ 网格化数据（三列数据分别是经度、纬度、地磁异常值）。
海测数据：科学号2015年、2016年、2017年中科院海洋战略先导科技专项-西太雅浦海山共三个航次的海测磁力成果数据。文件名为海测成果数据.txt，数据位于磁力数据文件夹下。分辨率1′，数据范围经度136.8-141°E，纬度7.5-10.5°N。将网上收集的地磁异常图中按照海上实际测线进行截取，获得与海上实测测线位置相同的地磁异常剖面（图3），然后将实测剖面与截取的剖面进行比对。

1. Free-air Gravity Anomaly Data
The submitted data consists of two categories: data collected from relevant websites, and data fused from in-situ marine survey data of the R/V Science and the online-collected data.

1.1 Online-collected Data
The global marine gravity anomaly data (satellite gravity data) with a resolution of 1 arcminute was downloaded from the website of the Scripps Institution of Oceanography, University of California, San Diego (https://topex.ucsd.edu/). This data is stored in the Free-air Gravity Anomaly Data subfolder under the Gravity Data folder. Its data range is: longitude 0° to 359° (0° to 179° correspond to 0°E to 179°E, while 181° to 359° correspond to 179°W to 1°W), latitude 80.7366°N to 80.7367°S. Owing to the large overall size of the dataset, the data is split into 36 files, with each file covering a 10-degree longitude span. The filenames are named after their longitude ranges, e.g., 0-9.txt contains free-air gravity anomaly data corresponding to longitude 0°E to 9°E and latitude 80.7366°N to 80.7367°S (positive values denote north latitude, negative values denote south latitude). Each data file is formatted as ASCII-encoded XYZ gridded data, with three columns representing longitude, latitude, and free-air gravity anomaly value, respectively.

1.2 Fused Data
The fused data was obtained through comparative fusion processing between the in-situ marine gravity survey data (Figure 1) from three cruises conducted in 2015, 2016 and 2017 under the Chinese Academy of Sciences (CAS) Strategic Priority Research Program on Oceanology – Western Pacific Yap Seamounts, and the online-collected gravity data. The fused data file is named "Fused Data.txt", and is also stored in the Free-air Gravity Anomaly Data subfolder under the Gravity Data folder. Its data range is: longitude 136°E to 141°E, latitude 7°N to 11°N. The data format is also ASCII-encoded XYZ gridded data, with three columns representing longitude, latitude, and free-air gravity anomaly value, respectively.

2. Geomagnetic Anomaly Data
The submitted geomagnetic anomaly data consists of two categories: data collected from relevant websites, and in-situ marine survey data from the R/V Science.

2.1 Online-collected Data
The global geomagnetic anomaly data with a resolution of 2 arcminutes was downloaded from the Global Geomagnetic Database (https://www.geomag.us/). This dataset is sourced from satellite surveys, aerial surveys and partial marine surveys, and is stored as a single file named "mag.txt" under the Magnetic Data folder. Its data range is: longitude -180° to 180° (negative values denote west longitude, positive values denote east longitude), latitude -90° to 90° (negative values denote south latitude, positive values denote north latitude). The data file is formatted as ASCII-encoded XYZ gridded data, with three columns representing longitude, latitude, and geomagnetic anomaly value, respectively.

2.2 In-situ Marine Survey Data
The in-situ marine magnetic survey data comes from three cruises conducted in 2015, 2016 and 2017 under the CAS Strategic Priority Research Program on Oceanology – Western Pacific Yap Seamounts, aboard the R/V Science. The data is stored as a file named "In-situ Survey Data.txt" under the Magnetic Data folder, with a resolution of 1 arcminute. Its data range is: longitude 136.8°E to 141°E, latitude 7.5°N to 10.5°N. To perform comparative analysis, geomagnetic anomaly profiles matching the positions of the in-situ marine survey lines were extracted from the online-collected geomagnetic anomaly map (Figure 3), and then the in-situ measured profiles were compared with the extracted profiles.

搜集汇总

背景与挑战

背景概述

该数据集是2015-2019年全球海洋地质地球物理数据，主要包含自由空间重力异常和地磁异常两类数据，来源于网站收集和科学号海测融合成果。数据覆盖全球及西太平洋雅浦海山区域，格式为ASCII码XYZ网格化文本文件，总容量3.37 GB，适用于海洋地球物理研究。