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

Damen, M. C. J.

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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

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Chapter

Title:: An integrated study of the Nairobi area - Land-cover map based on FCC 1:1M. F. Grootenhuis & H. Weeda, K. Kalambo

Document type:: Multivolume work

Structure type:: Chapter

447 The mountain area (M) occurs above 2100 m with contour-lines close together, slopes >5% with parallel drainage. The slope area (S) ranges from between 1500-1800 to 2100 m, the general slope is <5% with parallel drainage. The escarpment area (E) ranges from 1800- 2100 m and is relatively flat with internal drainage. The plains (P) form the lowest elevation category below 1500-1800 m, slope <2% and a dendritic drainage pattern. In the mountain, area and the slope area, the altitude declines from NW-SE giving contour patterns with a SW-NE trend. The slope area has a very dissected appearance with the streams flowing to the SE giving a striking texture to the whole of this zone. The es carpment, the eastern edge of the Gregory Rift, is a distinct zone with an abrupt ele vation change marked by clear fault lines visible on the image. The plains in contrast are flatter and characterized by much less striking features. Vegetation is closely associated with these zones and provides more detail within these broad physiographic cate gories. For the landscape planner, this background knowledge of the physiography, is of great importance for constructing a viable plan. Land-use and proposed land-use must be appro priate to the whole bio-physical environment, and in the case of Nairobi, this cannot be properly understood without a perception of the physiography. Related to the physio graphic zones are variables such as climate, vegetation and soils which control human activity and ultimately establish land values, 3.2 Land-cover map 1:1M (Figure 4) The checking of the map in the field provided information on the location and character of the identified boundaries. The upper and lo wer boundaries of zone M, S,- E anti P could be- verified, but other boundaries within these zones were also visible. In some cases, the boundaries are a transition between forest and agriculture which is never very clear; foresters cultivate crops and farmers grow trees. Other boundaries between slopes (S) and plains (P) are very clear where large Table 2. Photo-tones of the land -coven map Symbol Phototone Land cover Location M1 dark red, red patches forest Aberdare Range M2 red, light yellow rangeland forest Ngong Hills E green mottled rangeland W of Nairobi light yellow yellow brown red bright red built up agriculture forest Limuru Road S1 light red light yellow (small patches) agriculture N£ of Limuru S2 green agriculture red mottled yellow built up Kikuyu Kiambu area S3 bright red Kahawa green agriculture Ruiru red mottled yellow black built up water bodies Thika area S4 bright red pink yellow (few spots) agriculture dairy SE of Limuru S5 brownish red built up Nairobi yellow/brown blue (few spots) agriculture range land forest Ngong area P1 yellow brown blue/brown/green rangeland Athi Plains P2 bright blue yellow/brown (small patches) built up Nairobi P3 green/yellow bright red brown rangeland agriculture between Nairobi and Thika P4 brown agriculture bright red yellow/brown rangeland (all' in small patches) 01 Donyo Sabuk Ruiru area Figure 4. Land-cover map. scale irrigated coffee plantations have been established. Informal settlements at the out skirts of Nairobi City, small scale farms and pastoral settlements form a transition and not a sharp line. The escarpment area (E) is more clearly delineated by the geographical features producing differences in physio graphic characteristics. These variations in vegetation and land- use visible on the satellite image, led to the realization that the original four ?ones could be further sub-divided into nine land- cover zones, based on differences in texture and tone (Table 2) In the mountain area (M) two zones were distinguished. M1, on the slope of the Aber- dares, this is a zone of forest plantations and mixed indigenous forest. M2, the Ngong Hills, which is a zone of grasslands with small forest remnants (Photo 1 and 2).

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