Dears, are there real-world examples that show-case t.select?
I cannot select maps from an absolute raster space-time dataset (in a
local Mapset)
that have the same starting dates (only, not time) as maps in another
raster space-time
dataset (stored however in the PERMANENT Mapset).
Is the different Mapset a problem?
I can't make it work, however, for space-time dataset within the same
Mapset.
Shouldn't the expression
```
t.select -d expression="D = if(start_date(A) == start_date(B), A)"
```
work?
I.e., I want to select maps from `milano_mod09gq_qc_250m@modis`
→ trl milano_mod09gq_qc_250m@modis |head
name|mapset|start_time|end_time
milano_mod09gq_QC_250m_1_doy2019001|modis|2019-01-01 10:30:00|None
milano_mod09gq_QC_250m_1_doy2019002|modis|2019-01-02 10:30:00|None
milano_mod09gq_QC_250m_1_doy2019003|modis|2019-01-03 10:30:00|None
milano_mod09gq_QC_250m_1_doy2019004|modis|2019-01-04 10:30:00|None
milano_mod09gq_QC_250m_1_doy2019005|modis|2019-01-05 10:30:00|None
milano_mod09gq_QC_250m_1_doy2019006|modis|2019-01-06 10:30:00|None
milano_mod09gq_QC_250m_1_doy2019007|modis|2019-01-07 10:30:00|None
milano_mod09gq_QC_250m_1_doy2019008|modis|2019-01-08 10:30:00|None
milano_mod09gq_QC_250m_1_doy2019009|modis|2019-01-09 10:30:00|None
whose starting dates (only, not time) coincide with maps from
`test_myd11a2_emissivity_average`
→ trl test_myd11a2_emissivity_average@PERMANENT |head
name|mapset|start_time|end_time
test_myd11a2_emissivity_average_2019_01_01T00_00_00|PERMANENT|2019-01-01
00:00:00|None
test_myd11a2_emissivity_average_2019_01_09T00_00_00|PERMANENT|2019-01-09
00:00:00|None
test_myd11a2_emissivity_average_2019_01_17T00_00_00|PERMANENT|2019-01-17
00:00:00|None
test_myd11a2_emissivity_average_2019_01_25T00_00_00|PERMANENT|2019-01-25
00:00:00|None
test_myd11a2_emissivity_average_2019_02_02T00_00_00|PERMANENT|2019-02-02
00:00:00|None
test_myd11a2_emissivity_average_2019_02_10T00_00_00|PERMANENT|2019-02-10
00:00:00|None
test_myd11a2_emissivity_average_2019_02_18T00_00_00|PERMANENT|2019-02-18
00:00:00|None
test_myd11a2_emissivity_average_2019_02_26T00_00_00|PERMANENT|2019-02-26
00:00:00|None
test_myd11a2_emissivity_average_2019_03_06T00_00_00|PERMANENT|2019-03-06
00:00:00|None
Given the selection works, and for the maps listed above (just an
example, notice the `|head`),
I would expect the maps
milano_mod09gq_QC_250m_1_doy2019001|modis|2019-01-01 10:30:00|None
milano_mod09gq_QC_250m_1_doy2019009|modis|2019-01-09 10:30:00|None
to be picked-up.
I can't work this out. Example:
```
t.select -d expression="C = if(
start_date(milano_mod09gq_surface_reflectance_1) ==
start_date(myd21a1_emissivity_29_best_above_09_low_zenith@PERMANENT,
milano_mod09gq_surface_reflectance_1)"
```
gives an error.
Any concrete examples?
The manual covers in theory all cases.
In practice however and in this case, I don't find it easy to follow.
Thanks, Nikos
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