These capabilities can be explored through the 3DEP Demonstration Elevation Application, an application enabling the exploration of US Digital Elevation Models (DEMs) that are published by USGS on The National Map. Contour – a raster contour function that supports specified contour intervals and options for smoothing to create more cartographically pleasing contours.Aspect categories are symbolized using hues (e.g., red, orange, yellow, etc.) and degree of slope classes are mapped with saturation (or brilliance of color) so that the steeper slopes are brighter. AspectMap - simultaneously shows the aspect (direction) and degree (steepness) of slope for a terrain (or other continuous surface).SlopeMap – the degree of slope is represented by a colormap that represents flat surfaces as gray, shallow slopes as light yellow, moderate slopes as light orange and steep slopes as red-brown.Elevation Tinted Hillshade – is a combination of a hillshade applied to the Terrain, fused to a colormap applied to the same Terrain to represent elevation.Multi-Directional Hillshade – shows hillshades computed from 6 different directions.Hillshade – a grayscale 3D representation of the terrain surface with a solar azimuth of 315 degrees and solar altitude of 45 degrees.Quick access to the following dynamically-generated elevation derivatives include: Datasets are described on the 3DEP Products and Services webpage. Availability and scales of data vary by location. All available resolutions of data can be visualized through the 3DEP Elevation Data Availability Index service.
The most current, highest resolution elevation data available are highlighted as users zoom in to larger scales. That data will continue to become increasingly available as 3DEP progresses towards its goal to complete nationwide lidar data coverage (IfSAR in Alaska) by 2023. The dynamic platform supports the exploration of Digital Elevation Models (DEMs) for the US and territories at a mixture of scales, including 1 meter DEMs. Elevation aspect map rendered in the 3DEP Demonstration Elevation Viewer.
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