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Use of High Resolution Satellite Data for Soil Mapping- Pilot Study in Botswana

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Use of High Resolution Satellite Data for Soil Mapping- Pilot Study in Botswana REMOTE SENSING CENTRE FAORSC Series No. 53 High resolution data series No. USE OF HIGH RESOLUTION SATELLITE DATA FOR SOIL MAPPING Pilot study in Botswana Study implemented by GCP/INT/458/FRA with the assistance of the Government of France by S. Guillobez (CIRAD-IRAT) and D. Lantieri (FAO) FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS Acknowledgements The authors would like to express then thanks to: - The Ministry of Agriculture of Botswana, and Mr Remmelzwaal and his team on the FAD project BOT/85/011, for their assistance and valuable advice during the field visit The Land and Water Development Division, AGL, of the FAO Agriculture Department, for their support and comments - The technical services of IRAT - Mrs E. David for her editing of the report TABLE OF CONTENTS INTRODUCTION I - GENERAL PRESENTATION OFTHE STUDY, A - General considerations I A 1 - Ob1ectives of the studV I A 2 - Introducing Botswana I B - Presentation of the test sites I P 1 - Choice of the test sites I B 2 - Gaborone, Kanye and Molepolole sites I R 3 - Nxai Pan test site I C - Basic products and documents available I C 1 - Satellite and airborne products acquired I C 2 - Basic cartographic products I D - General methodology I D 1 - General considerations on soil mapping I D 2 - Methodology for satellite data analysis: the hierarchical approach I D 3 - Methodological aspects of pilot projects II - TEST SITES: RESULTS OF THE ANALYSIS II A - 1:250 000 soil mapping using remote sensing II A 1 - The results in Gaborone site II A 2 - The results in Kanye site II A 3 - The results in Nxai Pan site TT A 4 - Technical conclusions (1:250 000) II B - 1:50 000 soil mapping using remote sensing II B 1 - Results in the Dimawe Alveole sub-area test site IT R 2 - Results in the Molepolole sub-area test site II R 3 - Technical conclusions (1:50 000) II C - Technical conclusions on soil mapping and remotely sensed data IT C 1 - General conclusions on the use of high resolution data II C 2 - 1:250 000 soil mapping II C 3 - 1:50 000 soil mapping VI III - ECONOMIC ASPECTS OF SMALL SCALE SOIL MAPPING (1:250 000) III A - Cost analysis III A 1 - Basic unit costs III A 2 - Pedologic study costs III A 3 - Conclusions on cost analysis III B - Benefit analysis III B 1 - Accuracy of results III B 2 - Speed of implementation III B 3 - Multidisciplinary interest III B 4 - Special case III C - Conclusions of Cost/Benefit analysis FINAL CONCLUSIONS BIBLIOGRAPHY VII LIST OF PLAITS, TABLES (SEF ANNEXES) PLATES Pl. 1 : Location map of study areas Pl. 2: Ground photographs Pl. 3 : 1:250 000 SPOT XS color composite image of Gaborone Pl. 4 : SPOT panchromatic 1:250 000 stereoscopic pairs of west of Gaborone image Pl. 5 : 1:250 000 geological map of Gaborone . 6 : 1:250 000 morpho-pedological map of Gaborone Pl. 7 : 1:250 000 standard SPOT XS color composite image of Kanye Pl. 8 : 1:250 000 morpho-pedological map of Kanye Pl. 9 : 1:25C 000 standard SPOT XS color composite image of Nxai Pan P1.10 : 1:250 000 physiographic map of Nxai Pan P1.11 : 1:50 000 SPOT XS color composite image extract of Dimawe P1.12 :1:50 000 morpho-pedological map of Dimawe P1.13 : 1 50 000 SPOT XS color composite image of Molepolole P1.14 : 1:50 000 morpho-pedological map of Molepolole TABLES Tab. T. : Hierarchical approach Tab IT : Soil mapping costs Tab. III : Summary of costs for the various steps in soil mapping according Lo the different methodologies compared Tab. IV : Analysis of mapping accuracy (1:250 000 soil map) Tab. V : Comparison of the advantages of various existing approaches using remote sensing (1:250 000 soil map) Tab. VI : Cost benefit. synthesis Tab. VII : Remote Sensing decision tree for 1:250 000 soil mapping IX INTRODUCTION This report deals with a pilot project carried out in Botswana. It seeks to assess the usefulness of high resolution satellite data, and in particular SPOT data, for soil mapping at 1:250 000 and ]:50 000 scale, The study was implemented by the FAO Remote Sensing Centre, in conjunction wiLh a"host" FAO project(ROT/85/011)currently being carried out in Botswana by the Land and Water Development Division. The technical study was subcontracted to CIRAD (International Cooperation Center for Agronomical Research and Development). The technical and administrative coordination of this project was undertaken through a French Trust Fund project of the FAO Remote Sensing Centre. The pilot study was performed over a five-month period. The 4eek period of field-work in Botswana was organized by the team oil specialists of the "host" project. I. GENERAL PRESENTATION OF THE STUDY I.A. GENERAL CONSIDERATIONS I.A.1 - Objectives of the study This study aims at analysing the conditions for using high resolutionsatellitedata, mainly SPOT, in soil mappingprojects carried out by FAO. It concentrates on three test sites, and endeavours to show the methodological approach and to analyse the economic advantages of using high resolution satellite data in developing countries. The project investigates in particular: the possibilities offered by visual and digital analysis methods of SPOT data for 1:250 000 and 1:50 000 soil mapping; the cost/benefit analysis of using SPOT data for soil mapping as compared to other data such as Landsat TM or MSS, or aerial photographs; further suggestions concerning the methodological approach which could prove technically and economically valuable for soil mapping in the framework of FAO projects. In addition, the report contains a number of specific comments concerning the use of SPOT data. I.A.2 - Introducing Botswana Physical geography Botswana is located in southern Africa and is traversed by the Tropic of Capricorn. It stretches over an area of 582,000 km2, a third of which is occupied by the Kalahari desert (Figure 1). The vast majority of the territory is more than 900 m in altitude. The Kalahari basin is surrounded by two high-standing regions: the Ganzi Ridge and the Eastern Ridge. Northwards, it is dividedinto three sections: the Okavango delta, the Kalahari desert and Lhe Makgadikgadi depression. Geology The ancient African land base is mainly a substratum composed of granites, gneiss, amphibolites, etc. Following an early volcanic phase, various sedimentary rocks (sandstone, dolomite, ...) belonging to different systems (Venterdop, Transvaal, Waterberg, Damara, ...) were deposited. At a local level, these formations were subsequently crossed by basaltic rocks(dolerites). Later, a new sediment layer settled closely associated to a volcanic phase, forming an infringement over the existing phases (Karoo system).Finally, since the quaternary, the Kalahari sands have covered a large portion of the country. Climate The climate can be described as arid, with annual rains ranging from 200 to 650 mm. The rainy season starts in Octobey and ends in March/April. Average temperatures are around 10 and 15°C in July and go up to 22-26°C in January. Vegetation The natural vegetation reflects the climatic conditions. The shrub and tree savannah is mainly made up of xerophile species (dominated by acacias), often mixed and variable in density. It covers the major part of the country, apart from the northernmost extent of the territory where deciduous forests can be found. Soils All the large soil groups can be found. Sandy soils are by far the most abundant (Kalahari sands). Cambisoils and luvisoils are also common. Locally, there are vertisoils and salted soils (Makgadikgadi). Human geography Only 5 per. e,17 the country area is cultivated land. The import of agricu]tt ( ainly sorghum) does not compare with the outsa value of raising and mining. The Governmentis towards the 1»-Aylotion of agricultural potential and, unquestionably,this cannot be carried out without better knowledge mapping of soils. I. B. - PRESENTATION OF THE TEST SITES I. B.1 - Choice of the test sites (plate 1) Three sites which were representative ofthe many pedologic conditions foundin Botswana were chosen by the FAO Land and Watcr Development Division and the Remote Sensing Centre: these were the following: Gahorone/Molepole site, in the southeast, Kanye, in the southeast, Nxai Pan, in the northeast. Soil studies were to be implemented over these areas, within framework of the main F.A.O. "host" Project, and the work was et: already being carried out or about to start. I.B.2 - GABORONE, MOLEPOLOLE and KANYE sites The Gabor. and Kanye sites belong to the same geographical region and there!=ore can be presented jointly. 3 Physical Geography Gaborone and Kanye are located in south eastern Botswana, mi the eastern border ofthe Kalahari basin, and are bordered by the Eastern Ridge. Geology Most existing geological formations in Botswana can be found in this region. Starting in the southeast and going northeastwards, the substratum (Gaborone granite), Kanye volcanites, Transvaal, Waterberg and Karoo sedimentary rocks, and finally Kalahari sands can be observed respectively. Dolerte sills are often included within the stratified sedimentary formations. e) Climate A feature of the Gaborone and Kanye region is its semi-arid climate with a dry season during which temperatures are so low they can lead to frost, and whose monthly rainfall does not exceed 100 mm. This is better explained by the fact it is located south of the Tropic of Capricorn. Vegetation Thevegetation growing in this region fits the major landscape units quite well. As an example, the Sandweld, made up of different types of tree and shrub formations, occupies theexpanse of Kalahari sands. The Harweld corresponds to tree savannas and forest and covers the soils developed over other geologicalformations.
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