From the web page of Thanh NGO-DUC

TRIP2: Flow Direction Map

Prepare the maps required by TRIP2

In this version of TRIP 2, we provide the 1.0 degree and 0.5 degree global flow direction map.

You can build a flow direction map with different resolution and for different regions by yourself. Some "rules" for the flow direction map that you should follow are listed below:

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[thanh@shui 1.0_deg_global]$ ncdump -h 1.0_deg_flwdir.nc
netcdf 1.0_deg_flwdir {
dimensions:
lon = 360 ;
at = 180 ;
variables:
float lon(lon) ;
lon:units = "degrees_east" ;
lon:valid_min = -180.f ;
lon:valid_max = 180.f ;
lon:long_name = "Longitude" ;
float lat(lat) ;
lat:units = "degrees_north" ;
lat:valid_min = -90.f ;
lat:valid_max = 90.f ;
lat:long_name = "Latitude" ;
int flwdir(lat, lon) ;
flwdir:missing_value = -9999 ;
}

Note: In the flow direction map, the longitude values were saved from "small to big". The latitude values were saved from "big to small".

Đã gọi từ http://hydro.iis.u-tokyo.ac.jp/~thanh/wiki/index.php?n=TRIP2.FlowDirectionMap
Trang này được sửa đổi cuối cùng vào June 15, 2007, at 03:04 PM