The Nigerian GNSS TEC (NIGTEC) Model, version 1.2

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INTRODUCTION
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The NIGTEC is a model of the ionospheric GNSS TEC over Nigeria (Longitudes 2-15 degrees East, Latitudes 4-14 degrees North)
The model can be used to obtain the ionospheric GNSS TEC at all locations over Nigeria.
For this version of the model (version 1.2), usage is encouraged to be restricted between years 2010-2018. There is plan to update the model biennially. The year span of encouraged usage will be expanded in subsequent versions of the model.
The model is developed by the method of artificial neural networks as detailed in the full paper which is on open access at http://www.sciencedirect.com/science/article/pii/S1674984716300052

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USAGE
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The program comes in a folder which contains all associating files
The main program to run is named NIGTEC.m
It generates a graphical user interface which is simple and easy to use
Users can either produce diurnal profiles or spatial maps
Users can also generate the diurnal profiles for all the days in a year by ticking the checkbox on the user interface
When the program runs, it creates the figure for the user specified details, and stores the corresponding data in a folder named Output (which is created within the same folder where the NIGTEC program is located)

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ALLOWED USAGE
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This program is only open for applications in research and education. Other users should contact Dr Daniel Okoh (okodan2003@gmail.com)

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ACKNOWLEDGEMENT
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Users must acknowledge the development of this program appropriately as stated below:
I (or We) acknowledge the developers of the NIGTEC model, and the Centre for Atmospheric Research, National Space Research and Development Agency, for making the NIGTEC model available

Appropriate citation of the full paper is:
Okoh et al. (2016)

Reference:
Okoh, D., Owolabi, O., Ekechukwu, C., Folarin, O., Arhiwo, G., Agbo, J., Bolaji, S., Rabiu, B. (2016). A regional GNSS VTEC model over Nigeria using Neural Networks; a novel approach. Geodesy and Geodynamics, 7(1), doi: 10.1016/j.geog.2016.03.003.

The full paper is available on open access at http://www.sciencedirect.com/science/article/pii/S1674984716300052

Download the Model here

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CORRESPONDENCE
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Dr Daniel Okoh
Space Environment Research Laboratory
Centre for Atmospheric Research
National Space Research and Development Agency
Airport Road, Abuja, Nigeria
Email: okodan2003@gmail.com

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