spot elevation

For accuracy assessment of the ASTER and SRTM ASTER DEMs, spot elevation were extracted from the toposheet as a reference data.

The authors cover the following modes through comparing and contrasting them: sounding, spot elevation, isobath, contour, hachure, hatch, shaded relief, land classification, figure-ground, stratigraphic column, cross section, line symbol, and conventional sign over the course of the bookAEs ten chapters.

An expert sets the characteristics related to the quality of each layer (e.g., the percent of uncoded spot elevation features).

Spot elevation symbols are useful only in an emergency when there is no time to review them.

Another form of identifying elevations is to mark proposed heights of objects by labeling the object with a spot elevation. It is important that drainage away from structures and important improvements be maintained when establishing elevations.

The "rule-of-thumb" for vertical accuracy expressed as ratio of flying height is that spot elevation accuracy should fall within the range of 1:8000 to 1:15000.

A close look at the spot elevations nearby, also circled in red, show why.