# Changes between Version 22 and Version 23 of PointObservationConventions

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Timestamp:
03/09/11 10:00:47 (8 years ago)
Comment:

This page has been superseded by a Microsoft Word file, now being edited outside the Trac system.

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• ## PointObservationConventions

 v22 '''This page is obsolete.  For a more recent draft, see''' [https://cf-pcmdi.llnl.gov/trac/attachment/ticket/37/CFch9-may4.docx     this Microsoft Word file] = Chapter 9 Discrete Sampling Geometries = Chapter 5 explains how to specify Coordinate Systems using coordinate variables and auxiliary coordinate variables. This section extends and modifies that framework for data with discrete sampling geometries, previously called "point observation data". {{{ #!html

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}}} == 9.1 Overview == == 9.2 Point Data == {{{ #!html

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}}} To represent data at scattered, unconnected locations, both data and coordinates use the same, single dimension. The 'coordinates' attribute is used on the data variables to unambiguously identify the time, lat, lon, and vertical auxiliary coordinate variables. == 9.3 Time Series Data == {{{ #!html

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}}} Discrete data may be taken at a set of named locations called stations. The set of observations at a particular station, if ordered by time, is a time series, and the file contains a collection of timeSeries features. == 9.4 Trajectory Data == {{{ #!html

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}}} Point data may be taken along a flight path or ship path, constituting a connected set of points called a trajectory. == 9.5 Profile Data == {{{ #!html

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}}} A series of connected observations along a vertical line, like an atmospheric or ocean sounding, is called a profile. The lat, lon locations are factored out into the profile. == 9.6 Time Series of Profiles == {{{ #!html

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}}} When profiles are taken at a set of stations, one gets a time series of profiles at each station, called a timeSeriesProfile. == 9.7 Trajectory of Profiles == {{{ #!html

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}}} When profiles are taken along a trajectory, one gets a time series of profiles called a trajectoryProfile. This looks like a collection of profiles (see 9.5), except that the profile locations are assumed to be a connected set of points along a trajectory. A single file may contain one or more such trajectoryProfile features. == 9.8 Other changes == {{{ #!html

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}}} === 9.8.1 New standard names === [http://www.unidata.ucar.edu/software/netcdf-java/reference/FeatureDatasets/CFencodingTable.html Summary of encodings] {{{ #!html

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}}}