About 300bceDicaearchus, adiscipleof Aristotle, placed an orientation line on theworld map,runningeast and west through Gibraltar and Rhodes.Eratosthenes, Marinus of Tyre, and Ptolemy successively developed the reference-line principle until a reasonablycomprehensivesystem of parallels and meridians, as ...
The combination of meridians of longitude and parallels of latitude establishes a framework or grid that can be used to locate exact positions on a map or globe. For example, a point made up of the coordinates 40° N 30° W is located at latitude 40° north of the Equator and longitude...
conic projection,conical projection- a map projection of the globe onto a cone with its point over one of the earth's poles equal-area map projection,equal-area projection- a map projection in which quadrilaterals formed by meridians and parallels have an area on the map proportional to their...
who remained unexcelled until the 16th cent. Scientific measurements of earth distances by means of meridians and parallels were first made byEratosthenes(3d cent. B.C.). Of the ancient scholars, the mathematician and geographerPtolemy(2d cent. A.D.), expounded on the principles of cartography...
Further, the precision of positioning in any given arbitrary system is determined ultimately by alignments with moving orbs not on the earth at all, be they navigational stars or Global Positioning System (GPS) satellites. The key to earthly positioning is in the heavens, and it has been so ...
GridUnderContentIndicates whether the map meridians and parallels will be drawn under the map content. InstanceGets the report instance object that contains the calculated values of this report definition object. LeftMarginGets the left margin for the subitem. (从MapSubItem继承。) ...
(Physical Geography) an equal-area map projection with the parallels and the central meridian being straight lines and the other meridians curved. It is often used to show world distributions of various phenomena [C19: named after Karl B.Mollweide(1774–1825), German mathematician and astronomer]...
2.269 MapMeridians 2.270 MapParallels 2.271 CustomData 2.272 DataColumnHierarchy 2.273 DataMembers 2.274 DataMember 2.275 DataRowHierarchy 2.276 DataRows 2.277 DataRow 2.278 DataCell 2.279 DataValue 2.280 DataColumnGroupings 2.281 DataGroupings 2.282 DataGrouping ...
ContentMargin Gets the margin between a map viewport and its content. GridUnderContent Indicates whether the map meridians and parallels will be drawn under the map content. Instance Gets the report instance object that contains the calculated values of this report definition object. LeftMargin ...
The projection maps meridians to vertical straight lines of constant spacing for meridional intervals of constant spacing, and circles of latitude to horizontal straight lines of constant spacing for constant intervals of parallels. Advantages: