PPT-Geodesy, Map Projections and Coordinate Systems

Geodesy the shape of the earth and definition of earth datums Map Projection the transformation of a curved earth to a flat map Coordinate systems xyz coordinate systems for map data. 23 to 24 26 to 30 25 to 30 23 to 25 20 to 23 23 to 25 21 to 32 21 to 30 20 to 27 18 to 27 September projection 20 to 22 26 to 30 26 to 29 23 to 25 20 to 23 18 to 23 21 to 32 21 to 30 20 to 26 18 to 26 Unemployment rate 58 52 to 53 50 to 52 49 to 5 But if you are doing a problem with either spherical symmetry going out the same distance in the x y and z directions is the same or cylindrical symmetry this means symmetry about one axis using different coordinate systems may make the problem easi – . An assessment of past emission projections reported by Member States under EU air pollution and greenhouse gas legislation. . Martin . Adams, Melanie Sporer. . Air and Climate Change Programme . (. mis. )Usage and (. mis. )Interpretation?. Greg Ball. BSPS meeting 16 December 2013: Gregball@orangehome.co.uk. Projections and Planning. Planners mainly interested in change over time rather than future stock. Bob Garland. Why project households?. Can’t just rely on population. projections for long term planning for housing. Need some systematic view of future housing requirements that is consistent from each local authority upwards to England. Datums. and Map . Projections. D’Arcangelis. 11/9/09. Every map user and maker should have a basic understanding of projections, no matter how much computers seem to have automated the process.. Hmmm…. COORDINATE SYSTEMS. . RECTANGULAR or Cartesian. . CYLINDRICAL. SPHERICAL. Choice is based on symmetry of problem. Examples:. Sheets - RECTANGULAR. Wires/Cables - CYLINDRICAL. Spheres - SPHERICAL. Geodesy. - the shape of the earth and definition of earth datums. Map Projection. - the transformation of a curved earth to a flat map. Coordinate systems. - (x,y,z) coordinate systems for map data. – . An assessment of past emission projections reported by Member States under EU air pollution and greenhouse gas legislation. . Martin . Adams, Melanie Sporer. . Air and Climate Change Programme . & . Sphere GCS. Celina Bolding & James Hughes. Historical Stereographic Projections. Believed to be one of the world’s oldest projections. Hipparchus (190 – 120 BCE) & Ptolemy (90 – 168 BCE) . 11.2. PROJECTIONS. DEF:. a projection is a representation of a three-dimensional shape on a two-dimensional surface.. PROJECTIONS. Projections are arranged into 3 categories:. multi-view. Isometric. distort a certain property. .. Definition: The representation of the globe on a two dimensional flat map.. All maps have four features that can be distorted that include: Shape, Size (area), distance, and direction. The reason for this being that there is no perfect way to represent a 3-D object on a 2-D plane. Each different type of map sacrifices one or more of these properties to make a flat map. . Helen You. Texas Demographic Conference. May 2018 . Austin, Texas. Texas Population . Projections . Program. TDC . produces. projections of the population of the . STATE. and all . COUNTIES. in the state by . & Types of maps. Map projections. Map projections. Cartographers have to deal with the problem of making maps of a spherical earth onto a flat surface .  this leads to . distortions. Shape can be distorted.