Evaluation of the Digital Elevation Model from the Shuttle Radar Topography Mission (SRTM) on the Papaloapan Macro-Basin, Mexico, using LiDAR as benchmark
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引用次数: 0
Abstract
The Digital Elevation Model (DEM) from the Shuttle Radar Topography Mission (SRTM) is evaluated using a LiDAR DEM from INEGI as benchmark in the Papaloapan Basin (~58,000km2) in Mexico. Three representative regions are selected: 1) a hilly region with strong slopes and elevations over 3,000m, 2) a transitional region with relatively smoother slopes and elevations around 1,000m, and 3) a floodplain with flat terrain and elevations below 100m. The straight comparison of both datasets shows very similar elevation values at the hilly and transitional regions. However, in the floodplain, the relationship has a parabolic shape, and errors are relatively higher, in terms of the elevation range. This is probably due to systematic errors in SRTM being very close to the actual low elevations. Maps of errors suggest strong association with water bodies and the aspect. For example, in the transitional region, most negative errors are found on slopes facing east, while positive errors are found on slopes facing west. Three-dimensional histograms of errors vs. topographic features (elevation, slope, and aspect) are estimated. The histograms suggest a systematic error, which means SRTM could be improved with a simple calibration at least in these cases. Evaluations of public DEMs from different sources in Mexico are considered necessary for the identification of their strengths and weaknesses. We believe these evaluations might provide the grounds for the creation of improved MEDs in the future either by either a simple calibration or through composite MEDs from multiple sources.
期刊介绍:
Published by the Mexican Institute of Water Technology, Water Technology and Sciences (Tecnología y ciencias del agua) is a highly specialized journal which reflects two important characteristics:
The interdisciplinary nature of its articles and notes.
The international scope of its authors, editors, reviewers, and readers.
It constitutes the continuity of the journal Irrigación en México (Irrigation in Mexico) (1930-1946); Ingeniería hidráulica en México (Hydraulic Engineering in Mexico) (1947-1971); Recursos hidráulicos (Hydraulic Resources) (1972-1978), and Ingeniería hidráulica en México, second period (1985-2009).
The journal is aimed at researchers, academics, and professionals who are interested in finding solutions to problems related to the water.
The journal’s contents are interdisciplinary and contain previously unpublished articles and notes that offer original scientific and technological contribution that are developed in the fields of knowledge related to the following disciplines:
Water and energy.
Water quality.
Hydro-agricultural sciences.
Political and social science.
Water management.
Hydrology.
Hydraulics.