The use of TM imagery to monitor the general health of coastal marshes /
(prepared by using training sites from the National
| Main Author: | |
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1994.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | (prepared by using training sites from the National accurate and reliable assessments concerning marsh health and a 1990 Winter scene were overlaid for change-detection and no-change errors. As was the case in this study, the any degradation and loss, causing unintentionally-introduced are possible. The traditional 2-layer overlay procedure be used more efficiently, by channeling resources directly because of field work and personnel required, the procedure between true-change and no-change situations, from change but less harsh conditions may give promising results. The change detection, in that two varied sources of information, clarity to warrant quantitative investigations to evaluate classes do not seem likely under the conditions stipulated, classifying an image to be used as a GIS layer in the 2- concerning alterations in the study area, except that which conditions of the test. These were: (1) seasonal could be extracted from the images and the NWI Map, and 5) DeSousa procedure, or modifications thereof to suit specific detected, at little expense; therefore limited budgets can differences, 2) no ground-truthed image, 3) no field work to difficult conditions. The classes were much cleaner (less digitally produced maps. each image to be studied. Therefore, a 4-layer overlay is error, by unrealistically shifting the water regime to a excessive care by the image-processing operator to capture field-corrected, 4-layer overlay appears to be of such General marsh-health monitoring without field observations guide the image processing; 4) no information used health were possible. The interpretations given in this Imagery. As monitoring is very expensive and time-consuming its full potential (not the subject of this study). layer over- Jay, each pixel is given a classification that layer overlay procedure for change detection. It involved logical mapping unit, and eliminates error. The results are may be correct or not. There is information to distinguish modelled out of the change-detection process; thus more much drier one. much superior to those of 2-layer processing. Applying the offer more information to be processed in a GIS. Errors are pern-tits no truly convincing means to correct errors. When Practically all areas of digital map making can benefit from prepared. The 4-layer overlay has superior structure for procedure was devised and compared to the traditional 2- processed change-detection map difficult conbecomes speckled processing of TM imagery permits classifications to the most proposed should cut costs. Areas of declining health can be requirements, can greatly enhance the quality of most speckled with error). Interpretations concerning marsh study are visual. Area quantification of marsh-health The 4-layer overlay procedure fared well under these the concepts involved in the procedure proposed. Multi-layer to be interpreted into general marsh-health classes. A new to locations where they are needed. Preprocessed imagery using a supervised and an unsupervised classification of was demonstrated to be feasible using TM (Thematic Mapper) Wetlands Inventory Map for the area) of a 1983 Summer scene with error. The 2-layer overlay could not cope with the |
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| Item Description: | "Major subject: Geography". Vita. |
| Physical Description: | x, 73 leaves : illustrations, maps ; 28 cm. Also available online. |
| Bibliography: | Includes bibliographical references. |