diff --git a/handbook/survey/i/orthoheight.jpg b/handbook/survey/i/orthoheight.jpg new file mode 100644 index 000000000..c70e5de65 Binary files /dev/null and b/handbook/survey/i/orthoheight.jpg differ diff --git a/handbook/survey/l/orthoheight.html b/handbook/survey/l/orthoheight.html new file mode 100644 index 000000000..c6409fcf0 --- /dev/null +++ b/handbook/survey/l/orthoheight.html @@ -0,0 +1,27 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=utf8" /> +<title> +Orthographic Height - Geoid and Ellipsoid +</title> +<link rel="stylesheet" type="text/css" href="../../../css/main2.css" /> +</head> + +<body> +<H1>Orthographic Height - Geoid and Ellipsoid</H1> +<div class="centre"><img alt="" src="/handbook/survey/i/orthoheight.jpg" /> +</div> + +<p>How the Ellipsoid height (which is what GPS reports) relates to the geoid height (altitude above mean sea level). Though many GPS devices say they report height above sea level, they are probably lying. + +<p> +From <a href="https://support.virtual-surveyor.com/support/solutions/articles/1000261349-the-difference-between-ellipsoidal-geoid-and-orthometric-elevations-">support.virtual-surveyor.com/support/solutions/articles/1000261349-the-difference-between-ellipsoidal-geoid-and-orthometric-elevations-</a></p> + + +<p class="caption">Photo © Philip S, 2023</p> + + +<hr /> +</body> +</html> diff --git a/handbook/survey/t/orthoheight.jpg b/handbook/survey/t/orthoheight.jpg new file mode 100644 index 000000000..5aa76de9b Binary files /dev/null and b/handbook/survey/t/orthoheight.jpg differ