Photogrammetry means To Measure With Light. As with any type of measurement there are of course a series of components that all contain some error, many of which are unknown at the time of observation. Images are recorded in the image space, which is to say that units of length in the x and y direction are … Continue reading Least Squares for Mapping Polynomials

# Author: geodesycorner

# Sample Lesson Plan: Intro to Satellite Altimetry

REQUIRED READING Ch. 5.2.7 Satellite Alitmetry - Torge, Wolfgang (2001) Geodesy. De Gruyter. Berlin, New York Overview of Satellite Altimetry Satellite Gravimetry v. Altimetry for Geoid Determination OVERVIEW What is Satellite Altimetry? Active remote sensing Missions Application of Satellite Altimetry Mean Sea Surface Geoid Determination Dynamic Ocean Topography OBJECTIVES Understand the basic principles of satellite … Continue reading Sample Lesson Plan: Intro to Satellite Altimetry

# HySEPs Presentation

# Overview of Satellite Altimetry

Due to the complexity of the Continuous Vertical Datum for Canadian Waters (CVDCW) project, this will become clearer as I write more about it, it was necessary to form a (semi) multidisciplinary team to tackle the problems that the project faced. This team is comprised of the Canadian Hydrographic Service (CHS) and the Canadian Geodetic … Continue reading Overview of Satellite Altimetry

# Re-Processing Old Altimetry Data

With satellite altimetry there have been two types of missions, geodetic missions (GM) and exact repeat missions (ERM). GM altimetry has a very high density of measurements that is due to its very long repeat orbit, this makes it particularly useful for deriving short wavelength features such as the variations in the geoid that are not … Continue reading Re-Processing Old Altimetry Data

# Satellite Gravimetry v. Altimetry for Geoid Determination

The question posed in this post is; whether it is better to use satellite gravimetry or satellite altimetry to determine a marine geoid? Satellite Gravimetry Major Missions: GOCE (ESA), GRACE (NASA) How it works: GOCE uses a gradiometer which is comprised of six accelerometers that measure differences in the gravity field. GRACE measures gravity by … Continue reading Satellite Gravimetry v. Altimetry for Geoid Determination

# Continuous Vertical Datum for Canadian Waters (CVDCW)

When navigating a ship the number one objective is to not sink the ship. To achieve this, it of course helps if the ship does not run into anything above or below the water surface but it is not always possible to see submerged objects coming up in time to navigate around them and so … Continue reading Continuous Vertical Datum for Canadian Waters (CVDCW)

# Right-Handed/Left-Handed Rules

For any kind of vector mathematics it is common to find cases in which you want to find a vector that is perpendicular to two other vectors, e.x. current/magnetic field/force, the moment of force (the cross-product of two force vectors), coordinates, etc.. We know from linear algebra that we can calculate this perpendicular vector by … Continue reading Right-Handed/Left-Handed Rules

# Describing a Coordinate System

One of the fundamentals of any spatial project is establishing a coordinate system to describe the data. This coordinate system allows us to pass our data along to another person and they are able to understand it, or enter the data into a computer system to process the data. A coordinate system is described by … Continue reading Describing a Coordinate System