This week's lab marked the start of three-part series dealing with issues of scale and resolution. For the final portion of the lab we compared SRTM data and LIDAR data, both of which had been re-sampled to a 90 m cell size.
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Comparison of SRTM
data and LIDAR data, both at 90 m resolution.
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The resampled DEMs and their derivatives (slope and aspect rasters) were compared visually and the overall range of DEM elevation values and average slope were also discussed. At the start the LIDAR DEM appears to have slightly more detail than the SRTM DEM. This appearance becomes very pronounced in the derivative products, with the LIDAR based slope and aspect rasters each containing so much detail that they appear almost pixelated.
The SRTM data has less detail than the LIDAR dataset simply because the data was collected from a satellite - it will never be able to capture the amount of data LIDAR can simply because it is too far removed to be able to do so. LIDAR data is normally collected via airplane, making it much closer to the source that it is remotely sensing.
*Originally published on November 23, 2015. Updated on 2/27/2017 to repair image links.
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