Remote sensing for resources development and environmental management: Remote sensing for resources development and environmental management

Damen, M. C. J.

Bibliographic data

Multivolume work

Persistent identifier:: 856342815

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A. A. Balkema

Identifier (digital):: 856342815

Language:: English

Additional Notes:: Volume 1-3 erschienen von 1986-1988

Editor:: Damen, M. C. J.

Document type:: Multivolume work

Volume

Persistent identifier:: 856343064

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Scope:: XV, 547 Seiten

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A. A. Balkema

Identifier (digital):: 856343064

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(26,7,1)

Language:: English

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: Damen, M. C. J.

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: 4 Renewable resources in rural areas: Vegetation, forestry, agriculture, soil survey, land and water use. Chairman: J. Besenicar, Liaisons: M. Molenaar, Th. A. de Boer

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: Land use from aerial photographs: A case study in the Nigerian Savannah. N. J. Field, W. G. Collins

Document type:: Multivolume work

Structure type:: Chapter

435 Symposium on Remote Sensing for Resources Development and Environmental Management / Enschede / August 1986 Land use from aerial photographs: A case study in the Nigerian Savannah NJ.Field Department of Surveying, Ahmadu Bello University, Zaria, Nigeria W.G. Collins Department of Civil Engineering & Construction, Aston University, Birmingham, UK ABSTRACT: Using medium scale photographs it was possible to estimate the land use in a test area of the Nigerian Savannah. A method of primary and secondary sampling was applied covering about 17% of the area. Significant changes were noted between 1950 and 1972 in woodland, farmland, and grass/scrub. Correlations were noted between accessibility and changes in land use. 1. OBJECT OF THE PROJECT 1.1 The object of this project was to devise a method for monitoring land use and land use changes over .areas of the Nigerian savannah region, using available aerial photography and simple interpretation techniques. Information on land use and land resources is not readily available and although methods using satellite data are very efficient they tend to be out of the reach of the ordinary user in a developing country because of expense and the lack of equipment for interpretation. 1.2 There is a large amount of aerial photography of Nigeria which has been flown at different times and was designed for use in the production of topographical maps. This material is archived after use, and still contains a wealth of information on vegetation and land use which has not been transferred to the topographical maps produced from it. As Philipson (1980) says, "if the aerial photography is available, the expense of acquiring and analysing other forms of remote sensing may not be justifiable." 1.3 The .project makes use of some of this material and obtains land use data from it with simple photointerpretation equipment such as would be available in most small survey organisations. Because of the large volume of data and the statistical tests which are necessary to test its relevance a microcomputer has been used in the processing of the information. It has been shown by Emmott (1981) in a pioneering study that"The Combination of conventional photointerpretation techniques with widely available computer facilities provides an efficient means for the measurement, storage and representation of land use data". 2. CHOICE OF TEST AREA 2.1 The test area is covered by the national map series Nigeria 1:50,000 sheet 145 NW Kajuru, and is an approximate rectangle bounded by longitudes 7°30 E 7°45 E; and latitudes 10°15'n, IOOso'N; with an approximate area of 750 sq km. The boundaries were slightly modified because of the photographic coverage. The area is situated in the southern part of Kaduna State immediately to the S.E. of the large industrial and administrative centre of Kaduna. The topography consists of gently undulating plains wide valleys (fadama) , the plains being interrupted in the S.W. by frequent rocky hills (inselbergs) (see figures 1 and 2) . The vegetation and climate are typical of the savannah with a 5-6 month growing period during the rains from April to September (Kowal and Knabe 1972) and it falls within the Northern Guinea savannah zone (LRDC 1979) recognised by some writers. Population density is nowhere very high, although several new market villages have developed over the last 30 years. Communications are generally poor, but there has been a certain amount of road improvement recently which has improved accessibility. (see figure 3). 2.2 The test area was chosen for five reasons: 1. It is fairly representative of the savannah; neither too far south to contain large areas of forest or derived savannah, nor far enough north to contain Sudan or Sahel vegetation. 2. The terrain and climate give rise to several types of farming systems, the influences of which on the landscape, could be interesting to investigate. 3. The influence of the large growing city of Kaduna on the nearby rural landscape may be worth studying. 4. The area is covered by 1 : 25, 000 scale aerial photography. Other areas, perhaps more suitable, are not so well provided for. 5. The Kajuru area is the site of the annual departmental survey camp and is therefore convenient and accessible for fieldwork. 3. SOURCE MATERIAL 3.1 The test area is covered by three generations of aerial photography flown at medium scale in 1950, 1'962, and 1972. Maps are also available at 1/50,000, 1/100, 000 and ' 1/250,000 scales, prepared from the 1962 photography. For this project the 1962 photography was not used directly because it is of a smaller scale (1/40,000) than that of other years and there would have been problems caused by the varying scales and the possibility of features recognisable on the other photography not being visible. 3.2 1972 photography This photography was taken by Renting Africa

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