tbase - Read 5-minute global terrain elevations from TerrainBase

Syntax

Description

[Z,refvec] = tbase(scalefactor) reads the data for the entire world, reducing the resolution of the data by the specified scale factor. The result is returned as a regular data grid and an associated three-element referencing vector.

[Z,refvec] = tbase(scalefactor,latlim,lonlim) reads the data for the part of the world within the latitude and longitude limits. The limits must be two-element vectors in units of degrees.

Background

TerrainBase is a global model of terrain and bathymetry on a regular 5-minute grid (approximately 10 km resolution). It is a compilation of the public domain data from almost 20 different sources, including the DCW-DEM and ETOPO5. The data set was created by the National Geophysical Data Center and World Data Center-A for Solid Earth Geophysics in Boulder, Colorado.

Note   Terrain Base Documentation: Link Terrain Base Data: Link

Examples

Read every 10th point in the data set:

[Z,refvec] = tbase(10);
whos

  Name              Size         Bytes  Class

  Z               216x432       746496  double array
  refvec            1x3             24  double array

limitm(Z,refvec)

ans =
   -90    90     0   360

Read data for Korea and Japan at the full resolution:

scalefactor = 1; latlim = [30 45]; lonlim = [115 145];
[Z,refvec] = tbase(scalefactor,latlim,lonlim);
whos datagrid

  Name       Size         Bytes  Class

  Z        180x360       518400  double array

See Also

etopo | gtopo30 | usgsdem

© 1984-2012- The MathWorks, Inc.    -   Site Help   -   Patents   -   Trademarks   -   Privacy Policy   -   Preventing Piracy   -   RSS