add io

README.md

@@ -3,7 +3,7 @@
 [![Language](https://img.shields.io/badge/python-3.5%2B-blue.svg)](https://www.python.org/)
 [![License](https://img.shields.io/badge/license-GPLv3-yellow.svg)](https://github.com/insarlab/MintPy-tutorial/blob/master/LICENSE)
 [![render](https://img.shields.io/badge/render-nbviewer-orange.svg)](https://nbviewer.jupyter.org/github/insarlab/MintPy-tutorial/tree/master/)
-[![Citation](https://img.shields.io/badge/DOI-10.1016%2Fj.cageo.2019.104331-blue)](https://doi.org/10.1016/j.cageo.2019.104331)
+[![Citation](https://img.shields.io/badge/doi-10.1016%2Fj.cageo.2019.104331-blue)](https://doi.org/10.1016/j.cageo.2019.104331)
 
 MintPy-tutorials contains the documentations for the [MintPy repo](https://github.com/insarlab/MintPy), mainly in Jupyter Notebook.
 
@@ -21,18 +21,23 @@ MintPy-tutorials contains the documentations for the [MintPy repo](https://githu
    - Interactive transection with [plot_transection](https://nbviewer.jupyter.org/github/insarlab/MintPy-tutorial/blob/master/visualization/plot_transection.ipynb)
    - Google Earth [doc](https://mintpy.readthedocs.io/en/latest/google_earth/)
 
-3. Custom applications. List of examples of how to build customized application using mintpy modules or processing recipe using mintpy scripts.     
+3. Read / write data files
+
+   - Read GMT *.grd file: [nbviewer](https://nbviewer.jupyter.org/github/insarlab/MintPy-tutorial/blob/master/io/read_gmt_grd.ipynb)
+   - Read / save time-series HDF5 file into text file: [nbviewer](https://nbviewer.jupyter.org/github/insarlab/MintPy-tutorial/blob/master/applications/save_data2text.ipynb)
+   - Read HDF5 files in Matlab: [m file](./io/read_hdf5.m)
+
+4. Custom applications. List of examples of how to build customized application using mintpy modules or processing recipe using mintpy scripts.     
 
    - Create water mask in radar coordinates: [nbviewer](https://nbviewer.jupyter.org/github/insarlab/MintPy-tutorial/blob/master/applications/water_mask.ipynb)
    - Tropospheric delay correction using GACOS products: [nbviewer](https://nbviewer.jupyter.org/github/insarlab/MintPy-tutorial/blob/master/applications/tropo_gacos.ipynb)
    - Post-processing of single interferogram after ISCE/stripmapApp: [nbviewer](https://nbviewer.jupyter.org/github/insarlab/MintPy-tutorial/blob/master/applications/stripmapApp_postprocessing.ipynb)
-   - Read / save time-series HDF5 file into text file: [nbviewer](https://nbviewer.jupyter.org/github/insarlab/MintPy-tutorial/blob/master/applications/save_data2text.ipynb)
    - Geo / radar coordinates conversion: [nbviewer](https://nbviewer.jupyter.org/github/insarlab/MintPy-tutorial/blob/master/applications/coordinate_conversion.ipynb)
    - Extract / plot displacement time-series of one pixel: [nbviewer](https://nbviewer.jupyter.org/github/insarlab/MintPy-tutorial/blob/master/applications/plot_displacement_timeseries.ipynb)
    - Plot GPS as quiver on top of InSAR data: [nbviewer](https://nbviewer.jupyter.org/github/insarlab/MintPy-tutorial/blob/master/applications/plot_gps_quiver.ipynb)
    - Average velocity estimation demonstration: [nbviewer](https://nbviewer.jupyter.org/github/insarlab/MintPy-tutorial/blob/master/applications/timeseries2velocity.ipynb)
 
-4. Simulation of 3D phase time-series. An example of simulating displacement, tropospheric delays, topographic residuals and phase ramps to construct a 3D raw phase time-series: [nbviewer](https://nbviewer.jupyter.org/github/insarlab/MintPy-tutorial/tree/master/simulations/). Handy tools for algorithm developers.    
+5. Simulation of 3D phase time-series. An example of simulating displacement, tropospheric delays, topographic residuals and phase ramps to construct a 3D raw phase time-series: [nbviewer](https://nbviewer.jupyter.org/github/insarlab/MintPy-tutorial/tree/master/simulations/). Handy tools for algorithm developers.    
 
 ## Useful links from external repositories ##