Wednesday, June 26, 2019

Sentinel Satellite Imagery

Note: due to the costs of accessing this data, it may be restricted to paid CalTopo accounts at some point in the future - we're going to leave it public as a trial run and see how that goes.

It's been a long, heads-down grind here at CalTopo as we work on the app, and new desktop features have been put on hold for now.  Occasionally, however, something crosses our desk that's so exciting that we can't not work on it.  Sentinel imagery is one of those features, and I haven't been able to put it down since discovering it yesterday.

Thanks to the Copernicus program, its Sentinel satellites, and the Sentinel Hub aggregation site, CalTopo's low-resolution MODIS daily satellite imagery is now supplemented by high-resolution Sentinel imagery on a weekly update cycle (Sentinel-2 images the globe every 5 days, but to keep things simple, the CalTopo UI uses weekly blocks).  For now, the layer is named "Weekly High-Res".


As with MODIS, once you select the layer, there are some configuration dropdowns:


When it comes to pre-trip planning, I truly believe this is a game changer - and that's not a term that's thrown around lightly at CalTopo.  How good is it?

A major use case is checking snow coverage for spring or summer trips, for example Mt Whitney.  MODIS can often give you a rough sense of the snow level to +/- 1000', but here's what it looks like zoomed in:


By comparison, here's a Sentinel image taken sometime in the past 5 days:


Dialing the clock back two weeks (+/- the 5-day acquisition window) gives a sense of the melt rate.  For exact dates, you'd need to consult Sentinel Hub's playground.


Say you want to know how 2017 (another high-snow year) compares to 2019?  Setting the timeline to "2 years ago" shows slightly less snow than the most recent shot from this year, but given the melt rate and uncertainty around exact acquisition dates, I don't think you can draw any conclusions other than the years being roughly comparable:


If you're not familiar with the Whitney area, a satellite image alone isn't going to help orient yourself.  Here's MapBuilder Topo blended with false color Sentinel imagery, giving a good visual of snow coverage without obscuring the map features:


Beyond snow coverage, here's a pair of images showing how Lake Powell's changing elevation over the past two months has impacted a canyon (show in false color so that the water is easier to identify):






33 comments:

  1. Already having a positive impact on my forthcoming weekend! Thanks Matt!!

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  2. Game changer indeed! Well done!

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  3. Amazing imagery, thank you! I was just looking at adding additional custom layers to determine summer snow pack, so this is very timely for trip planning.

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  4. Is that working only in the USA!

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  5. Thanks so much! Quick question, do you know which day of the week the Sentinel imagery is updated?

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    Replies
    1. There is a change coming which will show the date on the imagery.

      Delete
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      Delete
  6. Holy cow. Not just a game changer for trips, but a massive help for improving safety and pre-planning for sar teams. NCSSAR thanks you!

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  7. Awesome, thank you! Great help for our SAR team!

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  8. This is awesome! Was starting to go crazy trying to find out if any of my researched itineraries will be clear of snow. Would be happy to have a "Pro+" option which includes this beyond the usual pro ones.

    Now if you can just get the NatGeo maps.....which is all I ever use Gaia for.

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  9. Awesome work! Glad to see this getting implemented!!!

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  10. This feature seems not to be working today. I am looking at Mt. Sopris in Colorado and there is no change from today to 3 months ago. Is there some other choice that also needs to be made?

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  11. Nice work. I wish I had seen this a couple of months ago. Would have used it to map remote fires in Alaska.

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  12. Thanks, for such a great post. I have tried and found it really helpful. For more details to visit Satellite Imagery.

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    ReplyDelete
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    ReplyDelete
  18. My health was horrible before I decided to try the Protocol Of taking Dr. Okojie pure herbal mixture. I felt there was no hope for my health and I was to try the Protocol, thinking it wouldn’t work because I have visited so many hospital but same result. However, I was convinced by a Instagram friend to try the herbal medicine because I wanted to get rid of Herpes virus. The herbal mixture that was given to me was really quick and easy to take, within 2 week I was fully cured from Herpes. The herbal medicine really work and I will like to share this great doctor contact with you all email him drokojie2@gmail.com or WhatsApp +2349078751746 you won't regret it, I promise.

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  19. WHAT A GREAT MIRACLE THAT I HAVE EVER SEE IN MY LIFE. My names are Clara David I’m a citizen of USA, My younger sister was sicking of breast cancer and her name is Sandra David I and my family have taking her to all kind of hospital in USA still yet no good result. I decided to search for cancer cure so that was how I found a lady called Peter Lizzy. She was testifying  to the world about the goodness of a herbal man who has the roots and herbs to cure all kinds of disease and the herbal man's email was there. So I decided to contact the herbal man @herbalist_sakura for my younger sister's help to cure her breast cancer. I contacted him and told him my problem he told me that I should not worry that my sister cancer will be cure, he told me that there is a medicine that he is going to give me that I will cook it and give it to my sister to drink for one week, so I ask how can I receive the cure that I am in USA, he told me That I will pay for the delivery service. The courier service can transport it to me so he told me the amount I will pay, so my dad paid for the delivery fee. two days later I receive the cure from the courier service so I used it as the herbal man instructed me to, before the week complete my sister cancer was healed and it was like a dream to me not knowing that it was physical I and my family were very happy about the miracle of Doctor so my dad wanted to pay him 5 million us dollars the herbal man did not accept the offer from my dad, but I don't know why he didn't accept the offer, he only say that I should tell the world about him and his miracle he perform so am now here to tell the world about him if you or your relative is having any kind of disease that you can't get from the hospital please contact dr.sakuraspellalter@gmail.com or WhatsApp him +2348110114739  visit his website https://www.instagram.com/herbalist_sakurahttps://web.facebook.com/herbalistsakura/    https://drsakurahealthclinic.wixsite.com/website https://sites.google.com/view/herbalistsakura                               https://drsakuraspellcentre.blogspot.com/                 https://drsakuraspellcentre.wordpress.com/         for the cure, he will help you out with the problem. And if you need more information about the doctor you can mail me    davidclara223@gmail.com

    ReplyDelete
  20. I’m giving a testimony about Dr. KOKOBI, the great Herbalist, he has the cure to all manner of diseases, he cured my  breast cancer, though II went through different websites and I saw different testimonies about different spell casters and herbalists. I was like: ‘Many people have the breast cancer remedy, So why are people still suffering from it?’ I thought of it, then I decided to contact kokobiherbalremedycentre@gmail.com , I didn’t believe him that much, I just wanted to give him a try, he replied my mail and Needed some Information about me, then I sent them to him, he prepared it(CURE) and sent it to Airfreight Online Courier Service for delivery, he gave my details to the Courier Office, they told me that 3-5 days I will receive the package and i took the medicine as prescribed by him and I went for a check-up 1 week after finishing the medicine, I was tested for breast cancer negative, if you are a breast cancer patient or any cancer patient at all. Do me a favor for you to contact him and I will try my possible best to make sure you get cured, when you contact him, make sure you tell him that I referenced you.. contact him via: kokobiherbalremedycentre@gmail.com You can also message him on WhatsApp +254746618873 you can also call him via +2348114448587 website:https://kokobiherbalremedycentre.weebly.com  email me for more info @ pamela.drews77@gmail.com

    ReplyDelete
  21. ALL THANKS TO DR OSO WITH HIS HERBAL PORTION I WAS COMPLETELY CURED FROM BREAST CANCER. I'm here again to appreciate it. DR OSO God will always continue to bless you more abundantly, for the good works you do in my life, I will always keep on writing good and posting my testimonies about you on the Internet, I’m MARY JOHNSON from TEXAS . I was tested breast cancer positive, I saw a blog on how DR OSO cured people with his herbal portion, i did not believe in natural medicine but i just decided to give him a try, I contacted him, and explain my situation to him, few day later he sent me the herb, after taking DR OSO herbal medicine for few weeks i went to hospital for check up so luckily i was healed with his herbal portion, i am so happy. If you have any type of cancer problem or you are also infected with any kind of disease,

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    you can also email me for more info about DR oso via maryjohnson9700@gmail.com ALL THANK TO DR OSO . 

    ReplyDelete
  22. WHAT A GREAT MIRACLE THAT I HAVE EVER SEE IN MY LIFE. My names are Clara David I’m a citizen of USA, My younger sister was sicking of breast cancer and her name is Sandra David I and my family have taking her to all kind of hospital in USA still yet no good result. I decided to search for cancer cure so that was how I found a lady called Peter Lizzy. She was testifying  to the world about the goodness of a herbal man who has the roots and herbs to cure all kinds of disease and the herbal man's email was there. So I decided to contact the herbal man @herbalist_sakura for my younger sister's help to cure her breast cancer. I contacted him and told him my problem he told me that I should not worry that my sister cancer will be cure, he told me that there is a medicine that he is going to give me that I will cook it and give it to my sister to drink for one week, so I ask how can I receive the cure that I am in USA, he told me That I will pay for the delivery service. The courier service can transport it to me so he told me the amount I will pay, so my dad paid for the delivery fee. two days later I receive the cure from the courier service so I used it as the herbal man instructed me to, before the week complete my sister cancer was healed and it was like a dream to me not knowing that it was physical I and my family were very happy about the miracle of Doctor so my dad wanted to pay him 5 million us dollars the herbal man did not accept the offer from my dad, but I don't know why he didn't accept the offer, he only say that I should tell the world about him and his miracle he perform so am now here to tell the world about him if you or your relative is having any kind of disease that you can't get from the hospital please contact dr.sakuraspellalter@gmail.com or WhatsApp him +2348110114739  you can follow him up on Instagram @herbalist_sakura visit his website     https://drsakurahealthclinic.wixsite.com/website https://sites.google.com/view/herbalistsakura                               https://drsakuraspellcentre.blogspot.com/                 https://drsakuraspellcentre.wordpress.com/         for the cure, he will help you out with the problem. And if you need more information about the doctor you can mail me    davidclara223@gmail.com

    ReplyDelete
  23. I had HIV I was told there was no cure except medication that can control it, I totally lost hope, all I could think was losing my life because I was so depressed and confused about the whole situation , few weeks ago I read about Dr Ojie natural herbal medicine which was guaranteed, I ordered the medicine after using it for 2 weeks I went for test and I tested negative I am so excited to share my testimony thank you so much dr Ojie you can also contact dr Ojie via WhatsApp or call +2349015357322 Email doctorojie1@yahoo.com Dr ojie also have medications for, Kidney failure ,Herpes 1/2, CANCER, ALS (Lou Gehrig’s disease), Hepatitis A/B, chronic pancreatitis, Emphysema, COPD (Chronic , Obstructive Pulmonary Disease), asthma, Acute angle-closure Glaucoma, Diabetes, CHRONIC PANCREATITIS thanks everyone God bless.

    ReplyDelete
  24. HERPES INFECTION CURE IS 100% AVAILABLE WITH THE HELP OF DR OGBERAESE HERBAL MEDICINE.Joy and happiness is all i can see around ever since i came in contact with this great man Called Dr Ogberaese. i complained bitterly to him about me having herpes only for him to tell me it’s a minor stuff. He told me he has cured thousands of people but i did not believe until he sent me the herbal medicine and i took it as instructed by this great man, only to go to the hospital after two weeks for another test and i was confirmed negative. For the first time in four years i was getting that result. i want to use this medium to thank this great man. His name is Dr Ogberaese , i came in with his email through a friend in USA called Edith Rose and ever since then my live has been full with laughter and great peace of mind. i urge you all with herpes or HSV1&2 to contact him if you are willing to give him a chance. you can contact him through his email drogberaese54@gmail.com or you can also WhatsApp him +2348073818653

    ReplyDelete
  25. I’m giving a testimony about Dr. ISHIAKU, the great Herbalist, he has the cure to all manner of diseases, he cured my breast cancer, though I went through different websites and I saw different testimonies about different spell casters and herbalists. I was like: ‘Many people have the breast cancer remedy, So why are people still suffering from it?’ I thought of it, then I decided to contact ishiakuherbalcure@gmail.com , I didn’t believe him that much, I just wanted to give him a try, he replied my mail and Needed some Information about me, then I sent them to him, he prepared it(CURE) and sent it through DHL Online Courier Service for delivery, he gave my details to the Courier Office, they told me that 3-5 days I will receive the package and i took the medicine as prescribed by him and I went for a check-up 1 week after finishing the medicine, I was tested for breast cancer negative, if you are a breast cancer patient or any cancer patient at all. Do me a favor for you to contact him and I will try my possible best to make sure you get cured, when you contact him, make sure you tell him that I referenced you.. contact him via: ishiakuherbalcure@gmail.com You can also message him on WhatsApp +2348180828544 you can also call him via +2348180828544 website:https://www.ishiakuherbalcure.wordpress.com email me for more info @ juwanjames81@gmail.com

    ReplyDelete
  26. God bless Dr. Agbonhale for his marvelous work in my life, I was diagnosed of HERPES since 2018 and I was taking my medications, I wasn't satisfied i needed to get the HERPES out of my system, I searched about some possible cure for HERPES i saw a comment about Dr. Agbonhale, how he cured HERPES with his herbal medicine, I contacted him and he guided me. I asked for solutions, he started the remedy for my health, he sent me the medicine. I took the medicine as prescribed by him and 14 days later i was cured from HERPES you can reach him through his whatsapp +2349073130326 OR Email: dragbonhaleherbalhome@gmail.com

    ReplyDelete