TND TRIP2/Elevation Map

TRIP2

Prepare the maps required by TRIP2

Flow direction map
River sequence map
Elevation map
Extract a region of interest
Mask the upstream region of one given point

Attach:elevtn.gif Δ

Example of the 1.0 degree global elevation map provided by TRIP2

[thanh@shui 1.0_deg_global]$ ncdump -h 1.0_deg_elevtn.nc

netcdf 1.0_deg_elevtn {

dimensions:

lon = 360 ;
lat = 180 ;
time = UNLIMITED ; // (1 currently)

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" ;

float time(time) ;

time:title = "Time" ;
time:long_name = "Time axis" ;

float elevtn(time, lat, lon) ;

elevtn:missing_value = -9999f ;

}

Note: In the elevation map, the longitude values were saved from "small to big". The latitude values were saved from "big to small". The missing value is -9999f.