Unit Testing in the netCDF-c library using cmake

It appears to be the case that all current tests in the netcdf-c source tree are integration tests. That is they only access the library using calls to the externally visible API.

The DAP4 code testing is different in that it includes (for the first time) unit tests. These tests reference code that is considered internal to the library. For the library generated under autoconf, this is not a problem because those symbols are visible in the library: nothing is hidden.

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Implementing Multi-threaded IO for the NetCDF-3 format

The issue of multi-threaded read and write of NetCDF files has repeatedly arisen in the netcdf mailing list (netcdfgroup@unidata.ucar.edu). Read on for a discussion of some options.

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High Performance Netcdf-4 Proposal

This documents outlines a proposal to create an alternate Netcdf-4 file format targeted to high-performance, READ-ONLY, access.

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NetCDF Compression

The steady state of disks is full. --Ken Thompson

Introduction

From our support questions, it appears that the major feature of netCDF-4 attracting users to upgrade their libraries from netCDF-3 is compression. The netCDF-4 libraries inherit the capability for data compression from the HDF5 storage layer underneath the netCDF-4 interface. Linking a program that uses netCDF to a netCDF-4 library allows the program to read compressed data without changing a single line of the program source code. Writing netCDF compressed data only requires a few extra statements. And the nccopy utility program supports converting classic netCDF format data to or from compressed data without any programming.

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Accessing netCDF Data by Coordinates

Library software like netCDF or HDF5 provides access to multidimensional data by array indices, but we would often rather access data by coordinates, such as points on the Earth's surface or space-time bounding boxes.  This blog, with an accompanying iPython notebook, explores some issues with correctness and efficiency in accessing data by coordinates instead of array indices in a real-world example.

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