Aggregation and Subsetting in ERDDAP (a middleman data server). http://coastwatch.pfeg.noaa.gov/erddap Bob Simons <[email protected]> NOAA NMFS SWFSC ERD. Aggregating Gridded Data.
PowerPoint Slideshow about ' Aggregation and Subsetting in ERDDAP (a middleman data server)' - jill
An Image/Link below is provided (as is) to download presentation
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Standard request: time, lat, lon bounding boxWhat about unusual requests of gridded data,e.g., SST>35 ("Select by value")
ERDDAP's EDDTableFromEDDGrid creates a giant virtual table from a gridded dataset.Columns: longitude, latitude, time, sstQuery: e.g., longitude,latitude,time,sst&sst>35Response: a table (one data point per row)
Users can find and deal with one aggregated dataset.
Users can make one subset request to one aggregated datasetGrids: indices to get a temporal and spatial subset.Tables (selection constraints): any subset you want.(Not: one subset request to each unaggregated file,or worse, using FTP to download lots of entire files.)
Don't treat tabular/in-situ data like gridded data.