Closed b-reyes closed 2 years ago
Small correction:
The goal of this issue should be to make Platform.time1
identical to Platform/NMEA.time1
(for EK60/EK80) as Platform.time1
is a subset of Platform/NMEA.time1
.
Based on an offline discussion between @leewujung and me, we found that it is best to NOT make Platform.time1
identical to Platform/NMEA.time1
(for EK60/EK80).
The reasoning behind this:
Platform.time1
identical to Platform/NMEA.time1
, this makes it so that Platform.time1
can have repeated time values (something that wasn't apparent when we first created this issue). The problem with repeated time values is that several downstream items are impacted by this.
EchoData.compute_range()
we often use EnvParams._apply()
, which eventually uses the Xarray interp
function with respect to Platform.time1
. However, the interp
function does not allow for repeated values. Thus, we have to remove these repeated times if we want to use it.Platform
group, the only variables that use time1
are latitude
, longitude
, and sentence_type
. The really important variables in this group (in regards to time1
) are latitude
and longitude
. As it currently stands, Platform.time1
only corresponds to GPS NMEA sentences. Thus, by making Platform.time1
identical to Platform/NMEA.time1
the only upside is that sentence_type
can now have all of the NMEA sentence identifiers in it. The downside is that the variables latitude
and longitude
now need to have NaNs for NMEA sentences that are not GPS NMEA sentences and we now have repeated time1
values. Thanks @b-reyes for summarizing the result of our discussion. I'll close this issue now.
In issue #656 we found that it is important to make
Platform/NMEA.time1
identical toPlatform.time1
(for EK60/EK80) and that it is best to address this in V0.6.0. This topic has been discussed in #580, however, for this issue we will not address all items discussed in #580 (as some of them can be made in the v0.6.1 release).To make this change we need to remove the selection of certain times based off of
messages
in the lines belowhttps://github.com/OSOceanAcoustics/echopype/blob/e0b3cbff9459b57cc8320388cc1ac86da6063343/echopype/convert/set_groups_base.py#L145-L150