GDL may refer to:
- German Defence League
- GDL, the IATA airport code for Don Miguel Hidalgo y Costilla International Airport in Guadalajara, Mexico.
- Guadalajara, Mexico often referred just as "GDL" for its abbreviation.
- Godley railway station, England; National Rail station code GDL
- Grand Duchy of Lithuania
- GNU Data Language
- Geometric Description Language
- General-purpose Declarative Language
- Graph Description Language
- Graphite Description Language
- Game description language
- GNOME Developers Library
- The Graduate Diploma in Law, also known as the Common Professional Examination
- Gas diffusion layer, a component of a PEM fuel cell
- Gas dynamic laser
- Gewerkschaft Deutscher Lokomotivführer, a German trade union present in train companies
- Glucono delta-lactone, a natural food additive
- Graduated driver's licenses, a system used for identifying different tiers of drivers used by some states in the United States
- Generalized Distributive Law, a general message passing algorithm
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GNU Data Language
The GNU Data Language (GDL) is a free alternative to IDL (Interactive Data Language). Together with its library routines, GDL is developed to serve as a tool for data analysis and visualization in such disciplines as astronomy, geosciences, and medical imaging. GDL is licensed under the GPL. Other open-source numerical data analysis tools similar to GDL include GNU Octave, NCAR Command Language (NCL), Perl Data Language (PDL), R, Scilab, SciPy, and Yorick.
GDL as a language is dynamically-typed, vectorized, and has object-oriented programming capabilities. GDL library routines handle numerical calculations (e.g. FFT), data visualisation, signal/image processing, interaction with host OS, and data input/output. GDL supports several data formats, such as NetCDF, HDF (v4 & v5), GRIB, PNG, TIFF, and DICOM. Graphical output is handled by X11, PostScript, SVG, or z-buffer terminals, the last one allowing output graphics (plots) to be saved in raster graphics formats. GDL features integrated debugging facilities, such as breakpoints. GDL has a Python bridge (Python code can be called from GDL; GDL can be compiled as a Python module). GDL uses Eigen_(C++_library) numerical library (similar to Intel MKL) to have excellent computing performance on multi-cores processors, with better benchmark than IDL on large matrix operations.
