[GRASS-dev] Single row computational region

[Nikos Alexandris]

Dears, bear with me please.

# a raster map
r.info lst_LC81920282013103LGN01 -e |grep -v comments

map=lst_LC81920282013103LGN01
mapset=lst
location=wgs84_utm_z32n
database=/geo37/grassdb
date="Tue Oct 24 09:57:09 2017"
creator="nik"
title="Land Surface Temperature (C)"
timestamp="13 Apr 2013 10:00:09 +0000"
units=Celsius
vdatum="none"
source1="LC81920282013103LGN01"
source2="Image courtesy of the U.S. Geological Survey"
description="Land Surface Temperature derived from a split-window algorithm. "

# current extent
g.region -g

projection=1
zone=32
n=5033970
s=5032560
w=728550
e=729900
nsres=30
ewres=30
rows=47
cols=45
cells=2115

# raster profile
r.univar -g lst_LC81920282013103LGN01

n=1146
null_cells=969
cells=2115
min=21.1275978440738
max=38.3413213282611
range=17.2137234841874
mean=30.9545992176352
mean_of_abs=30.9545992176352
stddev=2.96870910093284
variance=8.81323372596147
coeff_var=9.59052669382173
sum=35473.97070341

# define a single row region
eval `g.region -g`
g.region -g s=n-$nsres

projection=1
zone=32
n=5033970
s=5033940
w=728550
e=729900
nsres=30
ewres=30
rows=1
cols=45
cells=45

# raster profile?
r.univar -g lst_LC81920282013103LGN01
# returns nothing.

# again, for the whole of it
r.univar -r lst_LC81920282013103LGN01
 100%
total null and non-null cells: 2115
total null cells: 969

Of the non-null cells:
----------------------
n: 1146
minimum: 21.1276
maximum: 38.3413
range: 17.2137
mean: 30.9546
mean of absolute values: 30.9546
standard deviation: 2.96871
variance: 8.81323
variation coefficient: 9.59053 %
sum: 35473.97070341


Is this expected? Continuing further with

g.region -g s=s-$nsres

returns nothing before up until the region becomes 7 rows tall. Then

r.univar -g lst_LC81920282013103LGN01

returns

n=33
null_cells=282
cells=315
min=27.1068085576393
max=31.2078924764929
range=4.10108391885359
mean=29.504924461646
mean_of_abs=29.504924461646
stddev=1.20251677356142
variance=1.44604659069658
coeff_var=4.07564769441995
sum=973.662507234318

Nikos
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