Exciting ERDDAP Features for Users Revealed

Discover the latest enhancements in ERDDAP, including the release of v1.74 with long title display improvements, expanded request options, constraints on tabular data, and new ordering functionalities like orderByClosest and orderByLimit. Additionally, get a sneak peek into upcoming v1.76 features like the jsonlCSV output type. Explore these valuable updates for a better user experience.

• ERDDAP
• Data Access
• User Features
• Data Constraints
• Ordering Functionalities

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Presentation Transcript

1. New or Little Known ERDDAP Features (for Users) Bob Simons DOC / NOAA / NMFS / SWFSC / ERD Monterey, CA bob.simons@noaa.gov

2. ERDDAP v 1.74 released 2016-10-07 Didn't publicly announce it. (Long story.) But it is available and good. v1.76 is coming very soon.

3. Long Titles Fully Displayed (v1.74) No more "..." in long titles Thanks to Margaret O'Brien, LTER, and EML.

4. Other Request Options Each dataset's .html page and .graph page have lots of options, but the griddap and tabledap documentation describe more. https://coastwatch.pfeg.noaa.gov/erddap/griddap/documentation.html https://coastwatch.pfeg.noaa.gov/erddap/tabledap/documentation.html Notably, there are several additional parameters for graphs (most v1.66). For example, you can: Make the x or y axis descending &.xRange=min|max|ascending (t*|f) Specify the background color for a graph &.bgColor=0xAARRGGBB Specify the font size &.font=scaleFactor Specify a .png image's canvas size (in pixels) &.size=width|height Trim the whitespace at the bottom of an image &.trim=trimPixels Get an image with out|only the legend &.legend=Bottom*|Off|Only Some of these are thanks to John Kerfoot and Luke Campbell.

5. min(var) and max(var) in Tabular Data Constraints (v1.66) In general: &variable operator value &wtemp>=32 &time>now-2days New: (if min and max are known for a variable) &wtemp>=max(wtemp)-2 &time>max(time)-2days Thanks to John Kerfoot and Luke Campbell.

6. &orderByClosest("stationID, time, 1day:12hours") This is the closest thing to OPeNDAP/griddap "stride" in tabledap. Thanks to the Irish Marine Institute's Damian Smyth, Rob Fuller, and Adam Leadbetter.

7. &orderByLimit("stationID, 100") This is similar to SQL's LIMIT statement. Thanks to the Irish Marine Institute's Damian Smyth, Rob Fuller, and Adam Leadbetter.

8. New Output fileType=.jsonlCSV (v1.76) JSON Lines - For processing line-by-line. No enclosing {}. http://jsonlines.org/ Comma Separated Values. "Better than CSV" Thanks to the Irish Marine Institute's Damian Smyth, Rob Fuller, and Adam Leadbetter.

9. New Output fileType=.jsonlKVP (v1.76) JSON Lines - For processing line-by-line. No enclosing {}. http://jsonlines.org/ Key Value Pairs. Thanks to the Irish Marine Institute's Damian Smyth, Rob Fuller, and Adam Leadbetter.

10. Read about ERDDAP and try it out http://coastwatch.pfeg.noaa.gov/erddap/ Download and install ERDDAP http://coastwatch.pfeg.noaa.gov/erddap/download/setup.html Thank you! Questions? Comments? Suggestions? bob.simons@noaa.gov