Date: Mon Jan 13 2014 - 00:05:02 MST
thank you for you reply.
latitude and longitude of my data is as follows:
print(lat)
Variable: lat
Type: float
Total Size: 376 bytes
94 values
Number of Dimensions: 1
Dimensions and sizes: [lat | 94]
Coordinates:
Number Of Attributes: 3
long_name : latitude
units : degrees_north
mode : time-invariant
(0) -88.54195
(1) -86.65317
(2) -84.75323
(3) -82.85077
(4) -80.94736
(5) -79.04348
(6) -77.13935
(7) -75.23505
(8) -73.33066
(9) -71.42619
(10) -69.52166
(11) -67.6171
(12) -65.71251
(13) -63.8079
(14) -61.90326
(15) -59.99861
ncl 5> print(lon)
Variable: lon
Type: float
Total Size: 768 bytes
192 values
Number of Dimensions: 1
Dimensions and sizes: [lon | 192]
Coordinates:
Number Of Attributes: 3
long_name : longitude
units : degrees_east
mode : time-invariant
(0) 0
(1) 1.875
(2) 3.75
(3) 5.625
(4) 7.5
(5) 9.375
(6) 11.25
(7) 13.125
(8) 15
(9) 16.875
(10) 18.75
(11) 20.625
(12) 22.5
(13) 24.375
(14) 26.25
(15) 28.125
the lat coordinate is gauss grid , and the longitude grid is unformly increasing, they are 1-dimensional arrays.
my variable such as float TBOT ( time, lat, lon ) , 3-dimension.
in terms of your advices, i can extract some domain with TBOT(:,{xstart:xend}, {ystart,yend}) regardless of the lat/lon type
thanks
dyjbean@gmail.com
From: Dave Allured - NOAA Affiliate
Date: 2014-01-13 12:58
To: dyjbean@gmail.com
CC: ncl-talk
Subject: Re: [ncl-talk] can the brace generate domain you specified in non lat/lon projection grid?
What do your lat and lon coordinate variables look like? printVarSummary (lat) and printVarSummary (lon).
Yes you can use "coordinate subscripting" (curly braces) if the lat and lon coordinate variables are 1-dimensional, but not if they are 2-dimensional.
E.g. coordinate variable lat(lat) can be subset with coordinate subscripting {latstart:latend}. However, lat(x,y) can not be subset with coordinate subscripting, except var(:,{xstart:xend}, {ystart,yend}) is okay. But that may not be what you want, because x and y are often NOT latitude and longitude, but something else like index numbers, or meters on a UTM grid.
Published data sets on Gaussian grids are commonly made with 1-D coordinates. There are alternate subscripting methods for 2-D coordinate variables.
--Dave
(Please include user list in replies.)
On Sun, Jan 12, 2014 at 9:04 PM, dyjbean@gmail.com <dyjbean@gmail.com> wrote:
hi,
if data projection is not usually regular lon/lat but gauss projection,and its dimensionality is
time*lat*lon, i want to specify some domain, can the notation in var(:,{latstart:latend},{lonstart:lonend})
show the correct area specified ?
thanks
dyjbean@gmail.com
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