数据高程数据srtm-56-06

PROCESSED SRTM DATA VERSION 4.1 The data distributed here are in ARC GRID, ARC ASCII and Geotiff format, in decimal degrees and datum WGS84. They are derived from the USGS/NASA SRTM data. CIAT have processed this data to provide seamless continuous topography surfaces. Areas with regions of no data in the original SRTM data have been filled using interpolation methods described by Reuter et al. (2007). Version 4.1 has the following enhancements over V4.0: - Improved ocean mask used, which includes some small islands previously being lost in the cut data. - Single no-data line of pixels along meridians fixed. - All GeoTiffs with 6000 x 6000 pixels. - For ASCII format files the projection definition is included in .prj files. - For GeoTiff format files the projection definition is in the .tfw (ESRI TIFF World) and a .hdr file that reports PROJ.4 equivelent projection definitions. DISTRIBUTION Users are prohibited from any commercial, non-free resale, or redistribution without explicit written permission from CIAT. Users should acknowledge CIAT as the source used in the creation of any reports, publications, new data sets, derived products, or services resulting from the use of this data set. CIAT also request reprints of any publications and notification of any redistributing efforts. For commercial access to the data, send requests to Andy Jarvis (a.jarvis@cgiar.org). NO WARRANTY OR LIABILITY CIAT provides these data without any warranty of any kind whatsoever, either express or implied, including warranties of merchantability and fitness for a particular purpose. CIAT shall not be liable for incidental, consequential, or special damages arising out of the use of any data. ACKNOWLEDGMENT AND CITATION We kindly ask any users to cite this data in any published material produced using this data, and if possible link web pages to the CIAT-CSI SRTM website (http://srtm.csi.cgiar.org). Citations should be made as follows: Jarvis A., H.I. Reuter, A. Nelson, E. Guevara, 2008, Hole-filled seamless SRTM data V4, International Centre for Tropical Agriculture (CIAT), available from http://srtm.csi.cgiar.org. REFERENCES Reuter H.I, A. Nelson, A. Jarvis, 2007, An evaluation of void filling interpolation methods for SRTM data, International Journal of Geographic Information Science, 21:9, 983-1008.