GIS COMPARED TO MAPS Data stores • spatial data stored in digital format in a GIS allows for rapid access for traditional as well as innovative purposes • nature of maps creates difficulties when used as sources for digital data o most GIS take no account of differences between datasets derived from maps at different scales o idiosyncrasies (e.g. generalization procedures) in maps become "locked in" to the data derived from them o such errors often become apparent only during later processing of digital data derived from them • however, maps still remain an excellent way of compiling spatial information, e.g. field survey o maps can be designed to be easy to convert to digital form, e.g. by the use of different colors which have distinct signatures when scanned by electronic sensors • as well maps can be produced by GISs as cheap, high density stores of information for the end user o however, consistent, accurate retrieval of data from maps is difficult o only limited amounts of data can be shown due to constraints of the paper
This is the end of the preview. Sign up
access the rest of the document.
This note was uploaded on 12/04/2011 for the course GEB 1011 taught by Professor Staff during the Fall '08 term at Broward College.