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:: 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:: 6 Hydrology: Surface water, oceanography, coastal zone, ice and snow. Chairman: K. A. Ulbricht, Co-chairman: Mikio Takagi, Liaison: R. Spanhoff

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Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: Present state, changes and quality of Sologne and Brenne, two French large wetlands, studied with the MSS and TM Landsat data. Michel Lenco, Jean-Pierre Dedieu

Document type:: Multivolume work

Structure type:: Chapter

Symposium on Remote Sensing for Resources Development and Environmental Management / Enschede / August 1986 Present state, changes and quality of Sologne and Brenne, two French large wetlands, studied with the MSS and TM Landsat data Michel Lenco Ministry of Environment, Quality of Life Delegation, Neuilly s/Seine, France Jean-Pierre Dedieu Company SFERES-Teledetection, Montrouge, France ABSTRACT : This work was undertaken to give original informations to local administrative and scientific autho rities as an assistance to decision. At first, from Landsat TM and MSS data, the study yields cartographical (at 1/50.000 scale) and numerical informations in 23 classes on the present state and the late 1975/84 changes of the watershed land cover of two french large wetlands. Secondly, Landsat TM data processing in supervised classification have afforded mapped informations about depth, aquatic vegetation, turbidity and outer tempera ture of the ponds in ascertaining thresholds in channels 5, 1, 2, 3 and 6. RESUME : Ce travail a été entrepris pour fournir des informations originales aux autorités administratives et scientifiques locales en tant qu'aide à la décision. En premier lieu, à partir des données Landsat TM et MSS, l'étude donne les informations cartographiques (à l'échelle de 1/50.000) et numériques en 23 classes sur l'état actuel et les changements récents 1975/84 de l'occupation biophysique du sol du bassin versant de deux grandes zones humides françaises. En second lieu, des traitements des données Landsat TM en classification supervisée ont apporté des informations cartographiques sur la profondeur, la végétation aquatique, la turbidité et la température de surface des étangs en procédant à des seuillages dans les bandes spectrales 5, 1, 2, 3 et 6. 1. INTRODUCTION The aims of the study carried out in 1985 was to know the present state and the late changes of ecozones and land cover of the watershed and the water areas of Sologne and Brenne, which are two large wetlands of 130,000 and 145,000 ha extent respectively, situa ted in the center of France below the Loire river. There are several schemas both to bring out and pro tect these two natural media where the changes were important during the last ten years owing to hunting and fishing or maize cultivation development, and cattle breeding withdrawal. The remote sensing seemed a good tool to give cartographical, quanti tative and qualitative data on these humid areas as an aid to the decision. The study was managed in col laboration with local administrative and scientific authorities. 2. METHOD Two Landsat data recordings were used, a 7/27/1975 MSS tape and 6/17/1984 TM tape. An improved and restored false color image was elaborated for each date at 1/50.000 scale. After restoration, the ground resolu tion (pixel) was 50 x 50m in the first case, and 30 30m in the second one. The three wavelenghts choosen to establish the two restored images were 4, 5.and 7 for Landsat MSS, and 2, 4 and 5 for Landsat TM. The second image was interpretated to study the land cover of the two watersheds with the support of topographical, geological and potential vegetation maps and a sampling of photographies drawn out of the last national coverage at 1/30.000 scale. It was pos sible to obtain a classification with 23 items (see hereafter results). Landsat TM data appeared interes ting to detect easily meadows, cereals, conifers, wa ter surfaces and wetlands with the level of the soil humidity in the classes. Some difficult points needed a control on the ground, during the mapping proces sing : classification of wet vegetation on humid areas near water surfaces. The changes since 1975 were distinguished by compa rison of interpretated TM data with corresponding MSS data called on a screen in a processing station. Between the two dates a perceptible increasing of ponds in number and surface and a rise of the draina ge to develop the maize cultivation were noticed. The interpretated map was treated on computer to get sta tistics in hectorage for each class and changes. The channel 5 of 1984 Landsat TM data gives the possi bility to draw out the water surfaces and the wave lengths 1,2, 3 and 6 allow to study the characteris tics of water surfaces (depth, nature of the bottom, turbidity, aquatic,vegetation and temperature) in se lecting thresholds" in supervised classification with a discriminant analysis, because some ponds are regu larly analyzed and watched by local scientists and administrative authorities and were used as ground data. It was possible also to observe on the ground some ponds in june 1985 at the same period of the year that the catch of TM data. In the middle infra red, the channel 7 has brought nothing more than channel 5 to study the water surfaces. * some ratios 3. RESULTS 3.1 Classifications for mapping at 1/50,000 scale LAND COVER CLASSIFICATION code category 1- Building areas VI urban, dense 12 urban, mean and few dense 13 urban, diffuse 14 urban hold (industrial areas...) 15 bare soil, quarry, building yard 2- Agricultural areas 21 arable land 22 fields in copse (arable land and grassland) 23 wet meadows 24 reaped grassland and dry grassland 25 orchards, vineyards, nurseries 26 draining areas and areas in changing 3- Natural areas 31 hardwoods (oaks species,...) 32 softwoods (pines) 33 mixed forests 34 cuts 35 reafforestings (in conifers)

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