Yong Min Ho

Yong Min Ho GEOG370: Intro to GIS Lab 2 (7/10)

Question 1 Clear – Removes current coordinate system Transformation – Allows the conversion from one datum to another Modify – Provides information and other parameters of the current datum and allows modification of current datum (Changing angular unit and location of prime meridian) Import – Importing of new layers and data source New – It gives a choice between Geographic Coordinate System and Projected Coordinate System Add to Favorite – Adds current datum to favorite list

Question 2 Yes, it has changed. It has become less “flat” laterally and looks like it is projected on a round globe or cone. (-0.5) Since it changed from planner to conic projection. GCS-North American 1983 preserved the shape of the states, while USA Contiguous Albers Equal Area Conic preserved the area of the states.

Question 3 USA_Contiguous_Albers_Equal_Area_Conic Projection: Albers False_Easting: 0.000000 False_Northing: 0.000000 Central_Meridian: -96.000000 Standard_Parallel_1: 29.500000 Standard_Parallel_2: 45.500000 Latitude_Of_Origin: 37.500000 Linear Unit: Meter

GCS_North_American_1983 Datum: D_North_American_1983

Question 3 No it is not appropriate. (-1.0) (why?) Because it is an equivalent area map, it only maintains the correct land area, not the shape. The view of the entire world looks warped because non-USA countries looks “flatter” and more elongated than it should be. USA’s shape looks normal at the expense of the area represented by other countries. (-0.5) This projection is not appropriate for viewing the entire world, but is for viewing one particular country; because it is an equivalent area map, it only maintains the correct land area, not the shape. Question 5

There are four identical data frames within the layout view.

Question 6 (-1) The GCS North American 1983 projection show the world in a more elongated and flatter fashion, laterally. The Mercator projection has the poles elongated vertically but a slightly compressed area around the equator. The Robinson projection shows the areas around the center of the globe slightly warped and curved, while the Sinusoidal projection has the areas around the center of the globe severely warped and curved. GCS North American 1983, unprojected map, is composed only of a datum and has units of decimal degrees.

Robinson Projection appears to be similar to a cylindrical projection but the poles are more rounded in order to refrain from huge distortion near the poles. Question 7