Select signals per GNSS system

[alainmuls]

Dear Michael,

I have another question. Suppose we have a mixed GPS / Galileo RINEX observation file. Both systems have as observable type C1C and L1C. Now suppose that I only to read the C1C for both systems but only the C1C signal for Galileo. How should I specify the "meas" or do I have to select the same signals for both GNSS systems if they are both available?

kind regards Alain

[scivision]

Currently, we can't filter for different measurement sets on different systems.

So now, it's either ['L1C', 'C1C'] for every system you selected, or 'C1C' for every system selected, there isn't a subset selection like that at this time.

To enable this feature, one would have to consider if there would be enough benefit in read speedup. Is the motivation to read the files faster with the suggested subset of measurements?

[scivision]

One can of course do such selections after reading, that is fundamental to the choice of using xarray as an output data type.

[alainmuls]

Dear Michael,

Thanks for your answer. The intention was to separate the observables of the systems, but I discovered now also the possibility to just select a GNSS which does the job for me.

bye/ALain

On Tue, 5 Mar 2019 at 17:44, Michael Hirsch, Ph.D. [email protected] wrote:

Currently, we can't filter for different measurement sets on different systems.

So now, it's either ['L1C', 'C1C'] for every system you selected, or 'C1C' for every system selected, there isn't a subset selection like that at this time.

To enable this feature, one would have to consider if there would be enough benefit in read speedup. Is the motivation to read the files faster with the suggested subset of measurements?

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[scivision]

I think it's worth to consider this as a future enhancement. One could maintain the current usage of passing a string, list or tuple of systems. But then if one wants to select different measurements for each system, they could pass in a dict() with the key being system and values being measurements for each system. This isn't there today, but could be done in the future.

[alainmuls]

Dear Michael,

Yet another request from me. I read RINEX obs file in its full length, sometimes up to 24hr @ 1Hz. Is it possible for the plot command to specify a specific time interval, something like

tlim=['2017-02-23T12:59', '2017-02-23T13:13']

which can be used at reading the RINEX file?

Tx/Alain

[alainmuls]

Hi Michael,

Sorry, me again. Since sv and time are both coordinates, I thought it would be something like:

ax.plot(obsData.time, obsData['C1C'].sel(sv=['E04','E01'], time= ['2019-02-10T11:00:00', '2019-02-10T11:20:00']).dropna(dim='time',how='all'))

to select the first 20 minutes of a 1 hour NetCDF file obtained from RINEX obs data.

Info from that file: Dimensions: (sv: 6, time: 3600) Coordinates:

• sv (sv) object 'E01' 'E04' 'E14' 'E19' 'E21' 'E27'
• time (time) datetime64[ns] 2019-02-10T11:00:00 ... 2019-02-10T11:59:59

But then I get the error: KeyError: "not all values found in index 'time'"

I tried with adding ", method='nearest'" but that gives then errors about not being able to substraction or domething of that sort.

Also sometimes (only selecting on sv) the dropna part is giving errors, so when not using it, the plots are made.

Tx/Alain