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Topographic Change Mapping
Sample Results from LDART: Filled versus NonfilledBin Method Comparison | Bin Method Differences | Filled versus Nonfilled | Raw Point Data | GeoTiff Example | Elevation Contours The two images below were generated with exactly the same LDART options selected with the exception that the Filled option was either on or off. The images are color-coded by elevation as identified in the color bar to the right of the images. The lowest elevations are the darkest blue, the highest are dark red, and cells without a known elevation value are white. Elevations range between -2 to 50 meters (referenced to the North American Vertical Datum of 1988, or NAVD88). The Filled option results in an estimation of elevation values for cells without data values through the application of an inverse distance weighting (IDW) interpolation method. As can be seen in the examples below, the left image has not been Filled, so only cells containing actual elevation values are colored. Cells without elevation data are assigned a "nodata" value and appear white in the images. The right image was Filled during the binning process and, therefore, any cell without a value and with sufficient surrounding cells containing actual elevation values are Filled. The area shown is in the vicinity of Singleton Swash at the north end of Myrtle Beach, South Carolina. The data were collected during the October 1, 1997, LIDAR survey. The data were binned using a 2-meter cell size.  |
