Accuracy considerations in creating a topographic data base

Ammatzia Peled, Ron Adler, Joseph Forrai

Research output: Contribution to conferencePaperpeer-review


Accuracy constraints are of primary importance in developing a strategy for creating a National/Regional (DMDB) Digital Mapping Data Base. Other major considerations are cost benefit analysis and the current and future status of the data base components. Three sets of input sources were available for comparison within two areas, each one 5×5 km, in size: (a) Aerial photography at 1:40,000; (b) Aerial photography at 1:70,000; (c) The existing 1:50,000 - scale map color separations. The obtained data were compared with separately established control and with one another. In addition, data capture from air-photographs through photogrammetric stereoplotters, were analyzed. This combined with analyses of geodetic control and aerial triangulation accuracies was implemented to define the projected accuracy potential of the various mapping products. The cost benefit analysis included work time invested in various procedures involved. The paper presents the result of these investigations which became a basis for policy formulation. The major conclusion arrived at is that the National Digital Mapping Data Base should be based on newly captured data, organized in pre-specified coding system permitting the derivation of graphical output of known accuracy for different purposes. The newly created NDMDB will serve both future production of map series at the Survey and as a national source of digital mapping data for spatial analyses systems.

Original languageEnglish
StatePublished - 1991
Externally publishedYes
Event1991 ACSM-ASPRS Fall Convention - Atlanta, GA, USA
Duration: 28 Oct 19911 Nov 1991


Conference1991 ACSM-ASPRS Fall Convention
CityAtlanta, GA, USA

ASJC Scopus subject areas

  • General Engineering


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