search

jfaghm / OceanEddies

A collection of algorithms to autonomously identify and track mesoscale ocean eddies in sea surface height (SSH) satellite data
92 stars 51 forks source link

Radius and speed distribution in reginal sea. #13

Open jin-liu-prc opened 7 years ago

jin-liu-prc commented 7 years ago

Hi, It's a great work for your team to provide such an validate method to detect eddies. Using your code, I studied statistical characters of eddies in the South China Sea. In order to compare results through your code and Chelton's dataset from 1993 to 2015, we limit amplitude biger than 1 cm and lifetime longer than 28 days. Compared with Chelton's dataset, lots of characters of this codes have validate improvements (e.g., number of eddies, frequency, polarity, amplitude). However, mean geotrophic speed and radius are much smaller than Chelton's. This is rahter confusing. According to geostrophic equilibrium, if radius is smaller (bigger), the geotrophic speed is bigger (smaller). Take cyclonic eddies for example, chelton_etal_cyc_ars faghmous_etal_cyc_ars Would you mind explaining this phenomenon? I am looking forward to your reply. Best wishes! @jfaghm

ryanLeeu commented 7 years ago

Hi, I am a graduate student in the Second Institute of Ocenography , State Ocenic Administration. Recently, I am also trying to use this code to detect eddy trajectory. But I can't build "mht" python module. Would you mind telling me what's your PC environments about python to build "mht" module? In my PC, there is Python3.6.1 and Visual Studio community 2017 on WIN 10 whose version is 15063. Thank you.

jin-liu-prc commented 7 years ago

Unfortunately, I just run my code in Matlab, you'd better ask the authors for help @ryanLeeu

ryanLeeu commented 7 years ago

Thank you very much.

claudiofgcardoso commented 7 years ago

Hello all,

I am using Faghmous et al. scripts to indentify and characterize the eddy field around Cape Verde. Unfortunately, I got similiar results as JinLiu1994 did for the rotational eddy speeds:

eddies_statistics2_7days

Three bands of high values are evident in the plot, which leads me to conclude that these results are not realistic. Maybe something is wrong within the scripts...

I really hope that this bug can be fixed... Greetings, Cláudio

PS: I am also using MatLab.

jfaghm commented 7 years ago

Please add as a GitHub issue so we can respond. Thank you.

Warmly, James

James H. Faghmous, Ph.D. Assistant Professor and Founding CTO The Arnhold Institute for Global Health Icahn School of Medicine at Mount Sinai Hiring Data Scientists (including postdocs), Data Engineers, Product Managers, and Front-End Devs

On Aug 20, 2017, 7:10 PM +0300, claudiofgcardoso notifications@github.com, wrote:

Hello all, I am using Faghmous et al. scripts to indentify and characterize the eddy field around Cape Verde. Unfortunately, I got similiar results as JinLiu1994 did for the rotational eddy speeds: Three bands of high values are evident in the plot, which leads me to conclude that these results are not realistic. Maybe something is wrong within the scripts... I really hope that this bug can be fix... Greetings, Cláudio PS: I am also using MatLab. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or mute the thread.

lishufeng017 commented 6 years ago

Hi, I'm not a student in oceanography, but I have to use the eddy radius to do my research. I'm confused about how the code give the radius and what the unit of 'SurfaceArea' are when we run 'scan_single.m' in matlab. Because if the unit is cm^2, the radius will extremely small. I'm confused so long time. Could you help me solve the problem?@JinLiu1994

zhouxingyulijingru commented 8 months ago

Hello, I am a new graduate student, can you teach me how to use this

zhouxingyulijingru commented 8 months ago

Can you tell me what is Chelton's dataset