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Utj'ITED NATIONS
ErCONOMIC
<AND SOCIAL COUNCIL
ECONOMIC CO~~AISSION FOR AFRICA Second United Nations Regional Cartographic Conference for Africa Tunis (Tunisia) 12-24 September 1966
DOCUMENTS OFFICE
Distr.
LIMITED
E/CN.14/CART/C.2/2 20 September 1966 Original , ENGLISH
'rILE COpy
NO TO BE TAKEN OUT DRAFT REPORT OF COMJ:iITTEE I I
by the Rapporteur
Photogrammetry and Topography
TU-131
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B/CN.14/CAln/c.;:12
DRAFT REPORT OF COMMITTEE II ON PHOTOGRAMMETRY AND TOPOGRAPHY
(by the napporteur)
1. Election of officers
The following wero elected officers of the Committee, Mr. M.C. Adana (Togo) Vice-Chairman Mr. Tayo Rota (Etrnopia) Rapporteur
2, Aerial photography, photograrnmetry and topographical lnapping
Under sub-item 12(b) of the agenda of the Conference" the Committee considered the folloWing papers :
Aerial photography for regional surveying and mapping
(E/CN.14/
CART/192); (submitted by the United states)
Photograrnmetry for regional mapping (E/CN.14/CART/19J) (submitted by the United States)
Mapping from airborne electronic control (E/CN.l ll/CART/194) (submitted by the United States)
The testing of new optical combinations for taking photographs and plotting at the Institut geographique national (E/CN .lh/CART/173)
(submitted by France)
Orthophoto and orthophoto map photogrammetric auxiliary means for solving technical tasks of engineering and land register in Africa
(E.CN.14/CART.204) (submitted by Germany)
Practical improvements in sterooplotting instruments (E/CN.14/
CART/214) and survey instruments and methods in tho United States of America
(E/CN.14/CJ\RT/215)
(submitted by the United States)-...
E/CN.14/CART/C.Z/Z Page 2
Stereo topographic surveying and techniques used in the USSR (E/CN.14/CART/~26) (submitteg hy tho USSR)
Ph:tointerpretation (E/CN. 14/c/u,T/227) (submi tted by the USSR) The Committee then proceeded to consider ,the, separate subjects under the,items :
Aerial photography
The problems encountered in obtaining aerial photographs due to weather conditions, the harmattan, haze and low clouds were discussed
and i t was reported that the use of infra red films and super-wide angle lenses had prodUced very valuable results. Although further successes were aLso reported through the use of electronic navigation devices and colour photography the Committee felt that research into
the methods of overcoming these difficulties should continue.
Auxiliary apparatu~
I t was reported that in addition to the Airborne Profile Recorder (APR) and the Horizon Camera, the aerodit had also been successfully used in Jifrica.
Ground Control
I t was reported that both conventional and electronic methods of establishing ground control were in use in Africa. Reports indicated growing developments in electronic equipment, but the need to continue further rasearch into control mothods was stressed.
Aerial triangulation
The Committee saw the need for further development and research in aerial triangulation. It, however, realized that research into the problems facing "frice could be better cerried out in Lfrica under i.fricun conditions and that the proposed ECA centres for Africa would playa prominent role in this respect.
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Photo interpretation
The raee t.i.ng ~eL., rsct.e of the l'C.l'e.r presented on the subject.
~hoto naps and OOS~iCD
The use of moscics 2nd photomaps weB discussed and it wes reported that Lor flat terrcin, "wamps, etc ••• photooaps could be produced cs ch er-pLy IlS pLamiraetr-a e nap s •
Topographical meps
The "pplice.tion of pbc t.ogr emnet.r-y to topo gr aph.i c uI ,,,epping wile di scussed • It ve s reported thr.t r.Ithough Uf.ps were being pro dueed eloost entirely by photoGrennetry the use of ground survey methods could not be ccnpletely elininetecl, eopecielly where wecther conditions were iopossiblc end ib ~re~s cf dense veget~tion •
Field convIction of D~P8
The Connittee hiscu8sed the ficl~~ c oup Let.tor. c.nu oI:eciing of r.1nps
produced fron aerial ,;r,(;t03rr:.phs c . n d cgrecc u n a mncus Iy thct n a ps Dust be checked on the crouud ~ The use of helicc~ter fur this purpose WRS nlsc reported. It, however, wns reclizecl thnt even ~fter the nost rigorous
c h ee l sa m i a t.r.aa s could n ot. be entirely c v ctd ed end thet it r aa y be useful tc E".dd f. note to e e . c h nc,p r - c q u e s t.in g users s p ot.ti u g m i s t - r . k e s to e n n o t . c t . e
the O"I'S end report thee; to the c artogr-r.pbac cge noy which publishes the
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Lerse scale ocppinH nnd cLdnstr~l survey
The Cooni ttee then c onai de r e d i ten 1~ (c) of, the Lwin cogende and discussed the ftlllowing papers
Grganizcticn and functionmng of the Cnrtogrcphic ~nd
ead~strel Service in Gcbon (E/CN.14/CbRT/16Qj end
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E/CN.24/Cl~T/C.2/2 Pe.ge /,I
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Tunisien experience in c~dnstrGI surveying ~E/CN.14/Cl.RT/196j
The COIlDittee sew ioportenee of ccdestrnl survoys to l,nd surveying, eQDinistrntion, registration and estnblisbclent cf ccdGstre (lnd decided to recoon,.na thet government orgr.nizc.tions dCl'.ling with the r e se s.r-ch end the lldninistrlltion of lund should be closely r e Lat.cc,
The use of eeriel survey methods in large scnle nnd ccdestrol mepping WE'.8 J:'0pcrted by Dor~ porticipnnts end it we s suggested thc~t c o nve rrti oneI and ceriel survey methods could be used in countries where the cnrtogr~_
phie orgnnizetions were still being Reveloped.
