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shows that `np.genfromtxt()`is consuming about 30% of processing time, and`xarray.concat`and xarray.Dataset` nested inside `concat` takes over 60% of time.
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shows that `np.genfromtxt()`is consuming about 30% of processing time, and`xarray.concat`and xarray.Dataset` nested inside `concat` takes over 60% of time.
*GPS satellite position is given for each time in the NAVfileas Keplerian parameters, which can be [converted to ECEF](https://ascelibrary.org/doi/pdf/10.1061/9780784411506.ap03).
* Maximum: ~60SV maximum near the equator in Asia / Oceania with5 degree elev. cutoff
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* Minimum: ~6SV minimum at poles with20 degree elev. cutoff andGPS only
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### RINEX OBS reader algorithm
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1. read overall OBS header (so we know what to expect in the rest of the OBSfile)
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2. fill the xarray.Dataset with the data by reading in blocks --
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another key difference from other programs out there, instead of
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reading character by character, I ingest a whole time step of text
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at once, helping keep the processing closer to CPU cache making it
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much faster.
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1. read overall OBS header (so we know what to expect in the rest of the OBSfile)
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2. fill the xarray.Dataset with the data by reading in blocks -- another key difference from other programs out there, instead of reading character by character, I ingest a whole time step of text at once, helping keep the processing closer to CPU cache making it much faster.
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### Data
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@@ -397,11 +399,10 @@ UNAVCO RINEX 2 data:
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*OBS: ftp://data-out.unavco.org/pub/rinex/obs/
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*NAV: ftp://data-out.unavco.org/pub/rinex/nav/
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### Hatanaka compressed RINEX .crx
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The compressed Hatanaka `.crx`or`.crx.gz` files are supported seamlessly via `crx2rnx`.
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These are distinct from the supported `.rnx`, `.gz`, or`.zip`RINEX files.
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Hatanaka, Y. (2008), A Compression Format and Tools forGNSS Observation
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Data, Bulletin of the Geospatioal Information Authority of Japan, 55, 21-30.
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Hatanaka, Y. (2008), A Compression Format and Tools forGNSS Observation Data, Bulletin of the Geospatioal Information Authority of Japan, 55, 21-30.
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(available at http://www.gsi.go.jp/ENGLISH/Bulletin55.html)
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