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by: LES

6

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# Webinar checklist none

LES
CU Denver

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webinar checklist
COURSE
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PROF.
TYPE
Class Notes
PAGES
2
WORDS
CONCEPTS
webinar, checklist
KARMA
25 ?

## Popular in none

This 2 page Class Notes was uploaded by LES on Tuesday September 27, 2016. The Class Notes belongs to none at University of Colorado Denver taught by in Fall 2016. Since its upload, it has received 6 views. For similar materials see none in none at University of Colorado Denver.

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Date Created: 09/27/16
GEOG-20180 Textbook notes Chapter 3- Map Projections Map projection - Geometrical transformation of E’s spherical / ellipsoidal surface onto flat map surface. -potentially infinite numver , key pt is some suited beter r osme uses than 4 others. How o distinguish 1 projection rom another and choose among them 1 oranize wide cariety of pojecetions in2 liimted numver of groups and families bo nbasis of shared attributes Common appproaches = classifying in2 families based on geometrical distorion properites ( relate 2 distance,shapedirection +area) -examine nature of surface used 2 onstruct projection ( place,cone, sylinder) -helps 2 udnerstand patern of spatial distoriton over map surface Impo 2 adress both cuz 1. Undestand what spatioal properties are preserved (or lost) an 2 w/ pattern and exctent of distoriotn Why are projecions necessary ? Globes vs Flat Maps Globes - give most realistic pic of E as whole -basic geometric properties )distnaace , direct, shape, area rpesered cuz same scale everwhere Disad = can’t see all pts of E’s surface simultaneiosly , most you can see is Hemisphere= ½ of E , can’t see detail like on raod map ,bulky ,little practical value 4 map reading +analysis cuz scale reduction ~ 1:125,000,000 , instrumets +techniques suited 4 measuring distance , direc, area on spherical surfaces = +diff. 2 ue ,computations +difficult , gobe constuction = laborious +costly , high speed printing press not been developed 4 curved media Why can’t b mapped undistorted onto flat medium ? E= NOT developable surface =surface than can b flattened ont place w/o geometrical distortion Only dev. Surfaces in our 3D world = cylinders, planes, cones Map Projection Process Swries of geometrical trans4mmations requires 1.define E’s irr. Top. as elevations aboe /sea depths below a more reg surface =geoid (WGS 84 ELLIPSOID (result surface if !lvls of worlds oceans (mean sea lvl0 extended under continents -datum(starting reference surface ) for elevation data on maps 2. Project slihlty udnulatin geod ont +reulae oblate ellipsod surface -basis 4 geodetic control pts determined by surveyors +datum 4 geodetic lat+long -Get geodetic lat+long since vertifal diff. Btween geoid +ellispde so smlall that horiz. Positions on geoid surface = oblate ellipsod surface (WGS 84 ) - geodetic lat+long converted in2 spherical coordinates 4 small scale maps - spherical coord. 3 Trans4m in2 planar (x,y) map prpjections furface coord. B manipulating data on comp. Where greatest distorition occurs Map Projection Properties

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