homepage Forums Altimetry Forum Obtaining point-wise SLA from gridded altimetry data

This topic contains 1 reply, has 2 voices, and was last updated by  aambrozio 9 months, 3 weeks ago.

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  • #16483

    Survix

    Hi

    Firstly, I want to appreciate everybody for sharing their ideas on this forum to help people get aroun their task. I hope to get answers to my problem also.

    So, I have the monthly gridded SLA altimetry data and I have been able to perform operation to plot the sla data against the latitude. However, I am interested in getting the value of sla at some particularly points (that coincides with the tide gauge locations). For to know the sla at the point latitude = 6.431 and lon =99.764 from a particular plot of the monthly sla.

    Please, how do I go about this?

    looking forward to prompt response.

    Thanks.

  • #16485

    aambrozio
    Participant

    Dear Survix,

    You can extrapolate the values at your points of interest.

    As an example, using the coordinates you provided , and using the product ESACCI-SEALEVEL-L4-MSLA-MERGED-20151215000000-fv02.nc from the SL_cci dataset V2.0_20161205:

    1. Create a dataset and load your product
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    2. Optionally, create a spatial filter around your area of interest, to limit the amount of data being processed
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    3. Select the variable of interest. In this example it’s SLA. And finally, this is the important step, in sampling select LOESS_EXTRAPOLATE, the limits of the area you want to resample, number of steps, and cut-off values (check BRAT’s manual, section ‘4.3.5.4.6. Sampling’, page 55, for more information)
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    4. Execute your operation and see the results
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    5. You can just see the extrapolated values or you can export the results to NetCDF, ASCII, …
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    I hope this helped.

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