University of Liverpool
Google Earth Engine Tools
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GEE Tools
推荐简介：
利用遥感卫星影像来研究边缘变化是环境过程和地球表面驱动因素的定量化指标，例如冰川边缘消退或海平面上升导致的沿海变化。这里介绍了三种新的、可免费使用的工具，它们可以一起用于处理和可视化，Landsat 4-8和Sentinel 1-2卫星存档数据，能够在很短的时间内实现高效的绘图(通过手动数字化)和自动量化边缘变化。这些工具对各种遥感专家的用户都是高度可访问的，在访问方面几乎没有计算、许可和知识方面的障碍。谷歌地球引擎数字化工具(GEEDiT)允许用户定义地球上任何地方的一个点，并通过一个简单的图形用户界面(GUI)对每个卫星的数据进行过滤，以获得用户定义的时间框架、最大可接受的云量，以及预定义或自定义图像波段组合的选项。GEEDiT允许从每个图像快速地绘制地理参考向量，图像元数据和用户注释自动追加到每个向量，然后可以导出用于后续分析。GEEDiT Reviewer工具允许用户对自己/他人的数据进行质量控制，并根据其特定研究问题的空间/时间要求过滤现有的数据集。边缘变化量化工具(MaQiT)是GEEDiT和GEEDiT Reviewer的补充，允许通过使用两种已建立的方法(以前用于测量冰川边缘变化)和两种新的方法，通过类似的简单GUI快速量化这些边缘变化。MaQiT的开发初衷是量化潮汐冰川末端的变化，尽管工具中包含的方法有可能广泛应用于地球表面科学的多个领域(例如,沿海和植被范围的变化)。这些工具将使地球科学领域的广泛研究人员和学生能够有效地绘制、分析和访问大量数据。
作者简介
James Lea M.A. 来自英国利物浦大学地理与规划系，是一名冰川学家，他对当代冰川学进程和历史冰块的重建和模拟都有广泛的兴趣。他的大部分工作集中在研究冰盖海洋边缘的动态机制，以及它们作为过去、现在和未来海平面变化的潜在动因。他使用了一系列方法，包括遥感技术，数值模拟和野外科学考察。
GEEDiT
GEEDiT(Google Earth Engine Digitisation Tool):
The Google Earth Engine Digitisation Tool (GEEDiT) and GEEDiT Reviewer are complementary tools that are designed to allow users to rapidly access time-series of full-resolution satellite imagery from anywhere on the planet and to manually digitize, review, and export margin information.GEEDiT Regional is suited for users interested in generating cloud-free composite/mosaicked images of large areas (rather than looking at time series of images), and digitizing features from these. GEEDiT Regional is not described in the original GEEDiT/MaQiT publication, but uses similar code – users should therefore cite the paper below if it is used in any publications. GEEDiT links: GEEDiT v1.012 – Tier 1 imagery – highest quality imagery GEEDiT v1.012 – Tier 2 imagery – imagery that does not meet Tier 1 criteria – includes Antarctic imagery currently missing from Tier 1 image collections
- Walkthrough videos GEEDiT – https://www.youtube.com/watch?v=UDdR5hRgNTg GEEDiT Reviewer – https://www.youtube.com/watch?v=Ob3zU9l5r0M
MaQiT
MaQiT（Margin Change Quantification Tool ）:
The Margin change Quantification Tool (MaQiT) is a free-to-use, easy-to-use standalone application that can be used to quantify the distance of margin change and merge/convert multiple GeoJSON files and shapefiles to single shapefiles. Users without a general Matlab license will be prompted to download and install the free Matlab Runtime software that will allow MaQiT to run (warning: this could take up to 1Gb of space on your hard drive!). For users with a general Matlab license, MaQiT can be run without installing Matlab Runtime by copying all script files to a single directory and running the MaQiT.m script. MaQiT can analyze datasets generated by both GEEDiT/GEEDiT Reviewer, and other pre-existing margin datasets. For datasets not generated by GEEDiT, the margin shapefiles must contain a field named ‘Date’ with values in the format YYYY-MM-DD. MaQiT will ignore all other fields. More information can be found in the supplementary readme file of the associated paper.
Windows:
MaQiT v1.03 – Remaining issues resolved. Contact me if any bugs arise!
Mac (download MaQiT_vX_xx.app folder):
MaQiT v1.03 – Remaining issues resolved. Contact me if any bugs arise!
Matlab scripts:
Download all scripts to a new folder. Run by executing MaQiT.m script
MaQiT v1.03 – Remaining issues resolved. Contact me if any bugs arise!
参考文献:
Lea, J. M.: The Google Earth Engine Digitisation Tool (GEEDiT) and the Margin change Quantification Tool (MaQiT) – simple tools for the rapid mapping and quantification of changing Earth surface margins, Earth Surf. Dynam., 6, 551–561, https://doi.org/10.5194/esurf-6-551-2018, 2018.
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面向科研人员的免费遥感数据集
