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7 changes: 4 additions & 3 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -179,11 +179,12 @@ Read location from NetCDF4 / HDF5 file can be accomplished in a few ways:
* using `xarray`

```python
obs = xarray.open_dataset('my.nc)
obs = xarray.open_dataset('my.nc')

ecef = obs.position
latlon = obs.position_geodetic # only if pymap3d was used
```

* Using `h5py`:

```python
Expand Down Expand Up @@ -248,7 +249,7 @@ shows that `np.genfromtxt()` is consuming about 30% of processing time, and `xar
## Notes

* GPS satellite position is given for each time in the NAV file as Keplerian parameters, which can be [converted to ECEF](https://ascelibrary.org/doi/pdf/10.1061/9780784411506.ap03).
* https://downloads.rene-schwarz.com/download/M001-Keplerian_Orbit_Elements_to_Cartesian_State_Vectors.pdf
* <https://downloads.rene-schwarz.com/download/M001-Keplerian_Orbit_Elements_to_Cartesian_State_Vectors.pdf>

### Number of SVs visible

Expand Down Expand Up @@ -292,4 +293,4 @@ Python package.
These are distinct from the supported `.rnx`, `.gz`, or `.zip` RINEX files.

Hatanaka, Y. (2008), A Compression Format and Tools for GNSS Observation Data, Bulletin of the Geospatioal Information Authority of Japan, 55, 21-30.
(available at http://www.gsi.go.jp/ENGLISH/Bulletin55.html)
(available at <http://www.gsi.go.jp/ENGLISH/Bulletin55.html>)