Black sand beaches about coastsat

[kvos]

hi @panchomolt, I guess you did set the parameter dark_sand = True in settings. At the moment the dark sand option only works for Landsat imagery but I haven't updated the Sentinel-2 classifier yet, if you try with L8 images it should work.

[kvos]

I need an entire day of manually digitising sand pixels to re-train the S2 classifier and I haven't had time to do this yet, hopefully it will be done soon!

[panchomolt]

Dear Kilian, Thank you very much for your quick answer. I will try with the recomendations that you gave me. I also have a doubt with the horizontal error in the evolution of the coastline... if we use satelite images we could have an error about 3-5 meters. The software has some correction about that possible error ? Kind Regards *Francisco Molteni Pérez* Ingeniero Civil Oceánico | Especialización Ingeniería Portuaria Encargado Laboratorio de Procesos Costeros - LabOcéano Ingeniería Civil Oceánica | Facultad de Ingeniería Universidad de Valparaíso | Av. Brasil 1786, oficina 29, Valparaíso Fono: +56 - 32 - 299 59 47 - [phone] El lun., 19 ago. 2019 a las 6:08, Kilian Vos (<[email protected]>) escribió:

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I need an entire day of manually digitising sand pixels to re-train the S2 classifier and I haven't had time to do this yet, hopefully it will be done soon! — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#30?email_source=notifications&email_token=AM52JUAEQMNDBGWNEELM2TTQFJWLVA5CNFSM4IMTC53KYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD4SMKMQ#issuecomment-522503474>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AM52JUD5EFOYAQXQAR7DXZ3QFJWLVANCNFSM4IMTC53A> .

[kvos]

Hi Francisco,

We evaluated the accuracy of the shorelines at 5 sites that had long-term in situ monitoring programs (Australia, USA, France and New-Zealand) and the horizontal accuracy is usually ~10m.

You can read more about the accuracies in this paper https://www.sciencedirect.com/science/article/pii/S0378383918305313?via%3Dihub

You are right, the georeferencing accuracy of the images is ~5m but then there are errors due to instantaneous and localised water levels as well as pixel resolution.
The only thing that you can correct for is the tide, you can find details about tidal correction in the paper.

Cheers,
Kilian

[sepaas2019]

Hi Francisco,

I hope you are very well. If I am not mistaken I have seen that your region is not a rectangle. Could you please advise how many points you used to define polygon for your region of interest?
Best wishes,

[panchomolt]

Hi Kilian, Everything is fine here... The region is a rectagle, but the quality picture isn't good enough.. I used 5 points to make the rectangle. I did evaluations of several beaches in Chile. If you want it I can send you the GIFs and the points of the beaches that I made ! It's a really interesting tool but now I'm comparing with ShorelineS another tool made by Dano Roelvink. Hugs ! *Francisco Molteni Pérez* Ingeniero Civil Oceánico | Especialización Ingeniería Portuaria Encargado Laboratorio de Procesos Costeros - LabOcéano Ingeniería Civil Oceánica | Facultad de Ingeniería Universidad de Valparaíso | Av. Brasil 1786, oficina 29, Valparaíso Fono: +56 - 32 - 299 59 47 - [phone] El dom., 25 ago. 2019 a las 23:22, sepaas2019 (<[email protected]>) escribió:

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Hi Francisco, I hope you are very well. If I am not mistaken I have seen that your region is not a rectangle. Could you please advise how many points you used to define polygon for your region of interest? Best wishes, — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#30?email_source=notifications&email_token=AM52JUFV2MMWEFM2DXGYCSTQGNEBFA5CNFSM4IMTC53KYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD5DEZ2Y#issuecomment-524700907>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AM52JUHGGBQLA7VZYQ77SPDQGNEBFANCNFSM4IMTC53A> .

[sepaas2019]

Hello Francisco,

It was me that I sent the message to you. Yes, I think it would be interesting to see the GIFs and the points of the beaches as you kindly suggested.

Best wishes,
H.

[sepaas2019]

Hello Francisco,

It was me that I sent the message to you. Yes, I think it would be interesting to see the GIFs and the points of the beaches as you kindly suggested. Could you please send them to the email that I sent you?

Best wishes,
H.

[panchomolt]

Hi Kilian, tomorrow I will send you the files !! in this moment i'm not in my office so i can't send it ! Hugs ! *Francisco Molteni Pérez* Ingeniero Civil Oceánico | Especialización Ingeniería Portuaria Encargado Laboratorio de Procesos Costeros - LabOcéano Ingeniería Civil Oceánica | Facultad de Ingeniería Universidad de Valparaíso | Av. Brasil 1786, oficina 29, Valparaíso Fono: +56 - 32 - 299 59 47 - [phone] El mar., 27 ago. 2019 a las 15:48, sepaas2019 (<[email protected]>) escribió:

…

Hello Francisco, It was me that I sent the message to you. Yes, I think it would be interesting to see the GIFs and the points of the beaches as you kindly suggested. Could you please send them to the email that I sent you? Best wishes, H. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#30?email_source=notifications&email_token=AM52JUHOUH4HJNFWAUIWV53QGWAHTA5CNFSM4IMTC53KYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD5I45NA#issuecomment-525455028>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AM52JUGIRYNX44PGHJWC7PLQGWAHTANCNFSM4IMTC53A> .

[panchomolt]

Hi Kilian, How are you ? hope everything is fine. Sorry for my late reply but I wasn´t in my office during the hole week. But well, Here I attache the beaches and the coordinates of the different places in were I used your codes. The Name and the coordinates are in the Beach_coordinates.txt I will be very thankfully if you tell me that i commited some mistakes or if i did it well, IU'm doing a lot of research of the evolution of coastal zones. Hugs ! El sol.gif <https://drive.google.com/a/uv.cl/file/d/1eKSvOOnuWW1ZYsb9PgKWP7LAn5uLaawG/view?usp=drive_web> Pta_lobos.gif <https://drive.google.com/a/uv.cl/file/d/1KnoA6YtUj5duRNGYIv3wGporaM47Wasl/view?usp=drive_web> Reñaca.gif <https://drive.google.com/a/uv.cl/file/d/1ArMFN_7lPw-C8VGUlcvMrQ8zse7-E6V4/view?usp=drive_web> Tunquen.gif <https://drive.google.com/a/uv.cl/file/d/1t5hgSl67o1epD0luWXaPoIZbCcpr7mWG/view?usp=drive_web> *Francisco Molteni Pérez* Ingeniero Civil Oceánico | Especialización Ingeniería Portuaria Encargado Laboratorio de Procesos Costeros - LabOcéano Ingeniería Civil Oceánica | Facultad de Ingeniería Universidad de Valparaíso | Av. Brasil 1786, oficina 29, Valparaíso Fono: +56 - 32 - 299 59 47 - [phone] El mié., 28 ago. 2019 a las 9:11, Francisco Molteni Perez (< [email protected]>) escribió:

Hi Kilian, tomorrow I will send you the files !! in this moment i'm not in my office so i can't send it ! Hugs ! *Francisco Molteni Pérez* Ingeniero Civil Oceánico | Especialización Ingeniería Portuaria Encargado Laboratorio de Procesos Costeros - LabOcéano Ingeniería Civil Oceánica | Facultad de Ingeniería Universidad de Valparaíso | Av. Brasil 1786, oficina 29, Valparaíso Fono: +56 - 32 - 299 59 47 - [phone] El mar., 27 ago. 2019 a las 15:48, sepaas2019 ***@***.***>) escribió: > Hello Francisco, > > It was me that I sent the message to you. Yes, I think it would be > interesting to see the GIFs and the points of the beaches as you kindly > suggested. Could you please send them to the email that I sent you? > > Best wishes, > H. > > — > You are receiving this because you were mentioned. > Reply to this email directly, view it on GitHub > <#30?email_source=notifications&email_token=AM52JUHOUH4HJNFWAUIWV53QGWAHTA5CNFSM4IMTC53KYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD5I45NA#issuecomment-525455028>, > or mute the thread > <https://github.com/notifications/unsubscribe-auth/AM52JUGIRYNX44PGHJWC7PLQGWAHTANCNFSM4IMTC53A> > . >

Acapulco/el sol/ Marineros

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-71.542919, -32.990665 -71.553098, -33.018152 -71.564618, -33.016163 -71.556480, -32.990038 -71.542919, -32.990665 Tunquen

-71.654757, -33.270431 -71.635419, -33.299001 -71.665376, -33.305069 -71.686421, -33.275598 -71.654757, -33.270431 Punta de Lobos

-72.026323, -34.411730 -72.030283, -34.431197 -72.048528, -34.423529 -72.035199, -34.411181 -72.026323, -34.411730 Reñaca

-71.543633, -32.962298 -71.541941, -32.974406 -71.550450, -32.974552 -71.550544, -32.962223 -71.543633, -32.962298 Portales -71.587275, -33.030514 -71.595513, -33.034681 -71.596752, -33.032777 -71.589031, -33.028781 -71.587275, -33.030514