Guide to Using the PolarWatch Catalog

Submitted by pwadmin on Mon, 03/04/2019 - 23:30

PolarWatch ERDDAP

ERDDAP is the data server that contains all the data in the PolarWatch catalog. Data can be previewed directly with the PolarWatch ERDDAP.

PolarWatch ERDDAP Data Holdings Screen Capture

To see the PolarWatch ERDDAP server data holdings, go to the following url:

https://polarwatch.noaa.gov/erddap/info

For more information on using the ERDDAP interface visit https://coastwatch.pfeg.noaa.gov

 

Using the PolarWatch Data Catalog to Preview and Download Data

 

The PolarWatch catalog enhances ERDDAP with a search and filter view of the datasets, interactive projected map based previews and a simplified data download interface.

  1. Open a browser and go to the following url:

    https://polarwatch.noaa.gov/catalog

    You will see summary entries for the datasets. Dataset composites from ERDDAP have been grouped to make the catalog less overwhelming. Key information about the dataset is front and center. You can filter the cards using the fields on the left.

    PolarWatch search and filter catalog

  2. Click on the Ice category from the list on the left

    You should see that only one card is now displayed.

    osi-saf card

  3. Click on the OSI-SAF Sea Ice Concentration Card

    You should see another summary page for the dataset.

    osi saf summary

  4. Click on the Preview button

    You will see a map of sea ice concentration for the antarctic.

    osi saf preview

  5. Go to the following url to view a preview map of Arctic Sea Ice

    https://polarwatch.noaa.gov/catalog/ice-MUR/preview/?dataset=daily&var=sea_ice_fraction&time=2019-03-02T09:00:00Z&proj=epsg3413&colorBar=KT_ice|||0|1|

    arctic osi saf preview

  6. Zoom in twice to select the area we will download for this tutorial.

  7. Click the refine and download button to go to the download form.

    The form is pre-filled with the details from your map view. The latitude, longitude, time and parameter are set to the area displayed on the map.

    polarwatch download form

  8. Click the download button to download a netcdf file to your computer.

Now you can view the NetCDF file in panoply or work with it in R, python or your software of choice.