South and Central American Trimetrogon Resources

Alirio de Matos  (1945) General Principles of Cartography. Brasilian Journal of Geography Vol 7:4 621:630

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Sub-director Geographic and Cartographic Service, Brasilian National Council of Geography

Abstract: The author first devotes some attention to the definition of Cartography and discusses its objectives as well as the paths it must follow to achieve them. After considering various definitions of Cartography, the author does not attempt to decide among them, but suggests as a working definition it is well to include within the scope of Cartography all field work which leads to map-making.

He then shows that the composition of a map always starts from previous work, and a map 1s in fact a problem resolved by successive approximations.

He examines field operations as they are carried out in Brazil: he considers various elements about the use of photogrammetry and is of the opinion that the trimmetrogon should be used in regions where there is no cartography or where it very poor. He gives a general outline of the method to be followed.

Then he examines those methods which have greatest precision and shows how photogrammetry obtains thousands of maps in less time than other methods, and furthermore economizes very considerably on the amount of field work necessary. Next he discusses the diverse field and office operations for the production of maps, and finally examines the processes used in design and the methods of reproduction.

At the end he discusses very briefly the most commonly used projections for topographic maps.

 

Jorge Zarur (1948) Geography and Cartography for Census Purposes in Latin America. Brasilian Journal of Geography V10:4, 561:5999

Assistant Secretary, Brasilian National Council of Geography

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A review of photography available for Central and South America. Indicates that there is vertical and trimetrogon photography for the following countries:

Argentina, Uruguay, Paraguay, Brazil, Mexico, Guatemala, El Salvador, Dominican Republic, Haiti, Cuba

But coverage is questionable in:

Ecuador, Peru, Bolivia, Chile, Honduras, Nicaragua, Costa Rica, Panama, Columbia, Venezuela

 

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