Map Projections - Spatial Mathematics: Theory and Practice through Mapping - page 210

appear on this geographic projection. At what angles do they intersect? Use the
measure tool to measure the distance between two specific lines of longitude.
Use the Data Frame Properties to change the map projection. Change it to
Projected → World → Eckert IV and consider the same issues as in the last
paragraph. Repeat the process for the Robinson projection. Consider the vari-
ation among these three projections.
Change the projection to Mollweide.
Do some research on the Mollweide map projection at sites such as the following
linked site embedded also in the QR code: http://www.diversophy.com/
petersmap.htm ; or, at the next link, also embedded in the next QR code
http://www.research.ibm.com/dx/proceedings/cart/cart.htm . On the Mollweide
projection recall from above that meridians are formed from ellipses.
Review the USGS map projections poster (linked below and also through the QR
code), and observe how Mollweide and Robinson fit into the categories listed on
the poster: http://egsc.usgs.gov/isb/pubs/MapProjections/projections.html
Change the projection to Projected → World—The World from Space. Note that
this is an orthographic projection. This perspective projection views the globe
from an infinite distance, giving the illusion of a globe. This projection is
therefore often referred to as “the world from space” because the globe in this
projection has this appearance. Select Apply but not OK yet to keep the coor-
dinate system box visible along with the map. Right click on the projection
name and select “copy and modify” and customize the orthographic as fol-
lows: Change the Center Longitude to − 75, the longitude of the eastern USA.
Select OK and look at your map. Think about what center latitude and center
longitude the projection should be set to in order to center the map on Egypt.