Local Data Manager Slices, Dices, Makes Julienne Fries

A prominent Canadian researcher has discovered that the command line argument -ayfs (pronounced "aye-fuzz"), when added to Unidata's Local Data Manager (ldm) software, creates a whole new era in IT infrastructure capability and a radical paradigm shift for mobile platform deployment.

Canadian scientist Steve Emmerson, currently employed by Unidata, added the option in 1993 to the C code base, but didn't get around to trying it until April 1st, 2014. Once he tried it he found that the option creates unprecedented scalability and on-demand self-service provisioning of computer capabilities. "It seemed like a good idea at the time," said Dr. Emmerson about the switch that can be enabled at runtime, "but I had no idea that it would transform Geoscience through innovative data services and enable revolutionary ways of wringing knowledge from an ever-expanding pool of Earth System science data."

[Read More]

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.

[Read More]

Quickly create Makefile entries for all objects in a project using Sed

ls *.f | sed 's/\.f/\.o) \\/' | sed 's/^/\t\$(ALIB)(/'
[Read More]

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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NetCDF4 use of dimension scales

Some thoughts on how shared dimensions could be done in a simpler way. [Read More]
Unidata Developer's Blog
A weblog about software development by Unidata developers*
Unidata Developer's Blog
A weblog about software development by Unidata developers*

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