SRTOGR performs a slant range to ground range conversion on the input SAR image, without requiring an elevation image or ground control points. Slant range radar data have a systematic geometric distortion in the range direction.

The horizon (in nautical miles) will be approximately the square root of the height in feet: Transformation to ground range requires correction at each data point for local terrain slope and elevation. The simplest conversion is to compensate for Earth's curvature, but leave the mountains leaning over.

elevation(lat1,lon1,alt1,lat2,lon2,alt2) computes the elevation angle, slant range, and azimuth angle of point 2 (with geodetic coordinates lat2, lon2, and alt2) as viewed from point 1 (with geodetic coordinates lat1, lon1, and alt1). The true, or ground range, pixel sizes vary across the range direction because of the changing incident angles. The angle between the horizontal plane and the line of sight is called as elevation angle. Overhead a Distance Measuring Equipment (DME) the indicated range will be equal to the altitude of the aircraft.

- ground range image, in which distances are measured between the platform ground track and the target, and placed in the correct position on the chosen reference plane Slant range data is the natural result of radar range measurements. 3. a = Equatorial radius (6,378.1370 km) b = Polar radius (6,356.7523 km) Derivation. You could use the OrthoResample tool to convert your PASLSAR-2 Level 1.1 scene into ground coordinates in a new output image.

The geocenter is the description of the universe where the earth is in the center.

Convert polar coordinates to specific angle range. This is usually called "slant range to ground range conversion". In order to deal with these problems, this paper presents an advanced equivalent slant range (AESR) model for the synthetic aperture radar undergoing an inclined circular orbit.

A better conversion requires an accurate DEM, but compensates for Earth's curvature as well as mountain layover. Slant Range.

In radio electronics, especially radar terminology, slant range is the line-of-sight distance between two points which are not at the same level relative to a specific datum. Radar scenes in slant range are automatically geocoded as they are read into the IMAGINE Viewer, therefore they are already in ground range projection. Most SAR images are converted to ground range. The mean radius of an ellipse equation (r_mu = (2 a +b)/3) computes the mean radius of an ellipsoid Ellipsoid with semi-axes of lengths a and b.. An example of slant range is the distance to an aircraft flying at high altitude with respect to that of the radar antenna. Because we want to know the range resolution in the ground-range (not the slant-range) it is necessary to convert slant-range to ground-range by dividing the slant-range distance by the cosine of the depression angle (γ). Since the Earth is an oblate spheroid, closely approximated by an ellipsoid, the IUGG defines the Earth's mean radius using:. The slant range is the distance between the two points, from radar to the target. The slant range (1) is the hypotenuse of the triangle represented by the altitude of the aircraft and the distance between the radar antenna and the aircraft's ground track (point (3) on the earth directly below the aircraft). Satellite Slant Range Calculator. The coordinates alt1 and alt2 are ellipsoidal heights.
Ask Question Asked 4 years, 4 months ago. One NM is approximately 6,000’ (actually 6,076’) Slant Range Overhead DME = Altitude in feet/6000. The resulting distance is measured in the slant-range previously discussed. SRTOGR can be used instead of the FLIGHT and STG functions when an elevation model does not exist, or where ground control points are difficult to collect (such as over water). Calculating Down Range and Cross Range Coordinates. Horizon Range.