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dc.description.abstractThe paper first reviews the situation regarding topographic mapping in Africa. While for some countries, the main concern is the production of new base maps, for many other African countries the main problem is the revision of a large number of existing maps which are now thoroughly out-of-date. The situation prevailing in most African national mapping agencies is then outlined and the availability of satellite photography and scanner imagery over Africa is then discussed. The results of tests of the accuracy and the content of topographic maps derived from satellite imagery conducted over a number of test sites having different landscape characteristics are summarized and discussed. Next some examples of topographic mapping from stereo-SPOT imagery are described, including those from Ethiopia, Djibouti aid Guinea. This is followed by further examples of purely planimetric line mapping from Nigeria and image mapping from Central Sudan, using monoscopic SPOT and TM images respectively. This leads on to a further discussion of a UNDP-supported national map revision programme carried out over Uganda. The paper then goes on to make a comparison of the respective attributes of small-scale aerial photography and satellite imagery for topographic mapping in Africa and concludes with a short discussion of the likely impact of the availability of higher resolution satellite imagery which is promised for the near future.en
dc.titleTopographic mapping from satellite imagery in Africaen
ags.descriptionNotesIncludes bibliographical references.en
ags.publisherPlaceAddis Ababa :en
ags.publisherNameUN. ECA,en
dc.coverage.spatialAFR
dc.coverage.spatialAfrica
dc.date.accessioned2011-06-16T07:01:38Z
dc.date.available2011-06-16T07:01:38Z
dc.date.issued1996-10
dc.identifier.urihttp://hdl.handle.net/10855/14884
dc.format.extent23 p. :
dc.languageeng
dc.typeWorking paper
uneca.subject.fulltaxonomyUNBIS::NATURAL RESOURCES AND THE ENVIRONMENT::CARTOGRAPHY
uneca.subject.fulltaxonomyUNBIS::NATURAL RESOURCES AND THE ENVIRONMENT::CARTOGRAPHY::PHOTOGRAMMETRY
uneca.subject.fulltaxonomyUNBIS::NATURAL RESOURCES AND THE ENVIRONMENT::CARTOGRAPHY::TOPOGRAPHIC MAPPING
uneca.subject.fulltaxonomyUNBIS::RESSOURCES NATURELLES ET ENVIRONNEMENT::CARTOGRAPHIE
uneca.subject.fulltaxonomyUNBIS::RECURSOS NATURALES Y MEDIO AMBIENTE::CARTOGRAFIA
uneca.subject.fulltaxonomyUNBIS::RESSOURCES NATURELLES ET ENVIRONNEMENT::CARTOGRAPHIE::PHOTOGRAMMETRIE
uneca.subject.fulltaxonomyUNBIS::RECURSOS NATURALES Y MEDIO AMBIENTE::CARTOGRAFIA::FOTOGRAMETRIA
uneca.subject.fulltaxonomyUNBIS::RESSOURCES NATURELLES ET ENVIRONNEMENT::CARTOGRAPHIE::CARTOGRAPHIE TOPOGRAPHIQUE
uneca.subject.fulltaxonomyUNBIS::RECURSOS NATURALES Y MEDIO AMBIENTE::CARTOGRAFIA::CARTOGRAFIA TOPOGRAFICA
uneca.conference.fulltaxonomyConference Categories::Conferences on Surveying, Cartography and Mapping
uneca.workflow.processedtrue
ags.creatorPersonalPetrie, G.
ags.creatorCorporateUnited Nations. Economic Commission for Africa
ags.creatorConferenceUN.ECA Regional cartographic conference for Africa (9th : 1996, Nov. 11 - 15: Addis Ababa, Ethiopia)
ags.subjectThesaurusDigital mapping
ags.subjectThesaurusCARTOGRAPHY
ags.subjectThesaurusPHOTOGRAMMETRY
ags.subjectThesaurusTOPOGRAPHIC MAPPING
ags.subjectThesaurusCARTOGRAPHIE
ags.subjectThesaurusCARTOGRAFIA
ags.subjectThesaurusPHOTOGRAMMETRIE
ags.subjectThesaurusFOTOGRAMETRIA
ags.subjectThesaurusCARTOGRAPHIE TOPOGRAPHIQUE
ags.subjectThesaurusCARTOGRAFIA TOPOGRAFICA
ags.subjectClassification03.01.00 Geo-information
ags.availabilityNumber56522
ags.availabilityNumber1966
ags.availabilityLocationECA-HQ
ags.rights.termsofusepublic
ags.RNECA/NRD/CART.9/ORG.13
ags.JN56522
ags.creatorConferenceCategoryConferences on Surveying, Cartography and Mapping
uneca.language.supporteden


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