Map Projections And Coordinate System Pdf Map Geodesy Arcgis desktop 10.8.2 projected coordinate system tables note: values may be rounded for display. area of use values are in decimal degrees based upon wgs 1984. table of contents. L3 map projections and coordinate system free download as pdf file (.pdf), text file (.txt) or view presentation slides online. this document provides an introduction to coordinate systems and map projections in geographic information systems.
Lec02 Coordinate Systems And Map Projections Pdf Latitude Geodesy In a projected coordinate system, locations are identified by x,y coordinates on a grid, with the origin at the center of the grid. each position has two values that reference it to that central location. Map projections are sets of mathematical models which transform spherical coordinates (such as latitude and longitude) to planar coordinates (x and y). in the process, data which actually lie on a sphere are projected onto a flat plane or a surface. Projections distort distance, area, direction and shape to greater or lesser degrees; choose projection that minimizes the distortion of the map theme. points of tangency, standard parallels and secants are points or lines of no distortion. It is important to understand the difference between a geographic coordinate system and a projected coordinate system and the spatial reference system for each.
Arcgis Explorer Map Projections Projections distort distance, area, direction and shape to greater or lesser degrees; choose projection that minimizes the distortion of the map theme. points of tangency, standard parallels and secants are points or lines of no distortion. It is important to understand the difference between a geographic coordinate system and a projected coordinate system and the spatial reference system for each. Projected coordinate systems, map projections, parameters, and linear units of measure current as of arcgis version 9.3 map projection parameters name sphere only. Two of the most challenging concepts in gis are geographic coordinate systems, projections, and the relationship between the two. this handout provides a brief overview of these two concepts, how they relate to one another, and how they are operationalized in arcgis and other gis programs. Supported linear units, map projections, and projected coordinate systems map projection parameters hotine two point lam1 phi1 lam2 phi2 phi0 k0. You will see the coordinate system from a global perspective while learning the location of some of the more significant lines of latitude and longitude. you will also demonstrate that the characteristics of the grid change with different map projections.
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