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:: 856641294

Title:: Remote sensing for resources development and environmental management

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

Scope:: IX Seiten, Seiten 551-956

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A,. A. Balkema

Identifier (digital):: 856641294

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(26,7,2)

Language:: English

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

Editor:: Damen, M. C. J.

Editor:: International Society for Photogrammetry and Remote Sensing, Commission of Photographic and Remote Sensing Data

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:: 5 Non-renewable resources: Geology, geomorphology and engineering projects. Chairman: J. V. Taranik, Liaison: B. N. Koopmans

Write comment:: Wegen zu enger Bindung kommt es teilweise im Original zu Textverlust.

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: Assessment of desertification in the lower Nile Valley (Egypt) by an interpretation of Landsat MSS colour composites and aerial photographs. A. Gad & L. Daels

Document type:: Multivolume work

Structure type:: Chapter

destructive effects of the thunderstorms between the years 1965 and 1975. Studies are now performed to protect the New El-Menia town against the run-off caused by the thunderstorms (Salem et al 1982). 3 INTERPRETATION followed in more details by using a 10 times magnifi cation of band 7. Some representative photomorphic units have been choosen to be studied in detail on aerial photographs. The aerial photographs were stu died with a mirror stereoscope and the zoom-transfer scope. 3.1 Multistage analysis 4. RESULTS AND DISCUSSION The main idea of a multistage analysis is to make a maximum use of the different remote sensing documents, in view of organizing but also of minimizing the field observations. This approach is referred by Lillesand and Kiefer (1979) for geology mapping. It has been recommended for the assessment of deserti fication by Rapp (1974/ and was successfully used by El-Hag (1984') . Landsat MSS imagery, conventional aerial photo graphs and ground truth have been used in the current study. Also, different tools have been employed to zoom on different features (e.g. over head projec tor and transparant screen, mirror stereoscope and zoom-transfer scope). It resulted progressivelly in more accurate information for corresponding smal ler units of the study area. The detailed informa tions, obtained from the aerial photographs and from the field observations have been fed in the small scale interpretation of the MSS landsat imagery. That allowed us to establish a map of the soil con ditions by comparing the image characteristics with the ground conditions. 3.2 Diazo processing technique This technique is based upon the idea that each fea ture has its own specific reflectance characteristics. Thus, the grey tone of different features in diffe rent bands will differ according to these characte ristics. It was noticed from the original negative images that the vegtation is dark in band 7 and light in band 5, whereas water is dark in band 4 and 5 and light in band 7. Light sand is dark in all bands. Consequently vegetation and light sand are indis tinguishable on band 7 but different in band 5, whereas vegetation and water can only he distingui shed by examining both band 5 and band 7. This comparison between two or more black and white ima ges is inconvenient. Producing the colour composites by superimposing two or three bands, each in a dif ferent colour, is a more convenient method. The in formation contained in different spectral bands are combined into a single colour composite. The preliminary documents used were neaative hlack and white frames of three spectral bands (4, 5 and 7) on a scale 1:1,000,000. A photographic enchancement was performed by using Agfa-Gevaert 081P-Graphic Gevalith ortho film. It resulted in two different enchanced images for each band, one has the maximal contrast within the desert area and the other within the cultivated Nile Valley. The obtained images were then colour-coded using the colour diazo tech nique (Gad and Daels 1985). For the desert area the colour composite was for med by magenta (band 7), cyan (band 5) and green (band 4). For the cultivated area the following combination was used : cyan (band 7), magenta (band 5) and green (band 4). 3.3 Visual interpretation The different landscape elements are represented by the image characteristics. The interpretation of the landsat images was performed first for the colour composites on Macro and micro photomorphic unit levels. The used image characteristics were : the colour classes, the, texture, the quality of the unit boundaries, homogeneity of shape and size and rela tive size. Some features have been choosen to be The delineation of photomorphic units in the desert area, supplemented with field observations and the existing base maps, reveals the different physieqtra- phic regions. 4.1 Western desert It was possible to distinguish the different erosio- nal and depositional features from the different docu ments. It was obvious that the wind erosion process is dominant obscuring the drainage pattern. Multista ge interpretation enabled us to localize the belts of sand sheet, sand dunes and the eroded limestone pla teau. @ 5(263) cm 263 l~n~n 135/134-263,®, Y.H.P (5~51 3/4(263),®,X,h,P/ti A ¡’TH 12(263) (ft Pi 4(263)(189) B in nl 4/189,®-c,Y,h,P/b I I 263,f,Y,H,b lo3 2/263-134, ®,Y,h,b c Multistage analysis of a sand sheet zone. A. Macro photomorphic units 8. Micro photomorphic units C. Aerial photo interpretation A. Plateau and Hills, 3. Sloping area (sandy and graveily material). :. Low elevated area (sandy rsaterltl}. Guillas * avin « V } /1 Nile Valley (Z2 16 íNlle Va 03 • *(3) f 7 r 71 (Nile /alle i6,f-m.X,H, iTTI 263/189,c,Y FF»=t3 3/189,c.Y.h 4.1.1 San< This land just west part of t (fig. 2a) patches. parts, wi pebble de also that nation of gravel. 1 the micro differeno deposits The aer area of s that it i It was al: tern in t! SE direct SE direct 1962). 4.1.2 Sam This phys: tomorphic composite bluish wh: microphoti smaller ui The inter] (fig. 3C) and the ii its morph< the movinc wind direc sat images it was no 1 tudinal d\ colour in detailed : vealed th< tudinal d)

Access restriction

Copyright

fullscreen: Remote sensing for resources development and environmental management (Volume 2)

Multivolume work

Volume

Chapter

Chapter

Table of contents

Cite and reuse

Volume

Chapter

Image

Image fragment

Citation links

Citation recommendation