Proceedings of Symposium on Remote Sensing and Photo Interpretation: Proceedings of Symposium on Remote Sensing and Photo Interpretation

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Multivolume work

Persistent identifier:: 842147969

Title:: Proceedings of Symposium on Remote Sensing and Photo Interpretation

Sub title:: October 7 - 11, 1974, Banff, Alberta, Canada

Year of publication:: 1974

Place of publication:: Ottawa, Ontario

Publisher of the original:: Canadian Inst. of Surveying

Identifier (digital):: 842147969

Language:: German

Other Title:: Nebentitel: Proceedings : Symposium on Remote Sensing and Photo Interpretation

Corporations:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Adapter:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Founder of work:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Other corporate:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Document type:: Multivolume work

Volume

Persistent identifier:: 84214806X

Title:: Proceedings of Symposium on Remote Sensing and Photo Interpretation

Sub title:: October 7 - 11, 1974, Banff, Alberta, Canada

Scope:: VII, 465 Seiten

Year of publication:: 1974

Place of publication:: Ottawa, Ontario

Publisher of the original:: Canadian Inst. of Surveying

Identifier (digital):: 84214806X

Illustration:: Illustration, Diagramme, Karten

Signature of the source:: T 15 B 1305

Language:: German

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

Corporations:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Adapter:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Founder of work:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Other corporate:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2015

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: WATER AND WETLANDS CHAIRMAN. - R. ELLEFSON

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: THE USE OF ERTS IMAGERY FOR LAKE CLASSIFICATION. F. L. Scarpace, R. E. Wade and L. T. Fisher

Document type:: Multivolume work

Structure type:: Chapter

Figure 5 shows a plot of band 5 exposure versus secchi depth for tree tannin colored lakes. While exposure values for tannin lakes don’t correlate with secchi depths, at a given secchi depth they consistently have lower exposure values than non-colored lakes. One possible explanation for this phenomenon is that turbidity caused by the brown colored tannin dye dissolved in the water absorbs light while the particulate turbidity caused by phytoplankton increases lake reflectivity. Analysis of 11 Lakes Using Digital Gray Level Data From ERTS Computer Tapes Using computer programs developed for this study, digital brightness values for 13 lakes in south central Wisconsin were extracted from ERTS computer tapes. The technique involves the use of a Princeton Electronic Products (PEP) interactive graphics terminal to display a representation of the area of interest in band 7. The high contrast between the lake image and the land surrounding it in this band allows for easy and positive identification of the lake to be analyzed. Using an electronic "joy stick," a cursor is positioned on the lake surface and the scene brightness value from 0 to 63 in all four bands at that location is accessed and stored on a high speed disk for further manipulation and analysis. This procedure eliminates measurement errors due to densitometer spot size and positioning, and data degradation due to photographic processing. In addition, any lake larger than several pixels (200 feet across each) can be analyzed with a high degree of accuracy. Graphs of scene brightness versus secchi depths for bands 4 and 5 are shown in Figures 7 and 8 respectively. The relationships between scene brightness and secchi depth as found by this computer analysis are to be compared with Figures 2 and 3. The relationship found for band 5 seems to be comparable. The standard deviation is less, but significant scatter occurs. The scatter in the regression suggests that there are either measurement errors or that the conditions in the lakes changed between the time of sampling and ERTS passover. Measurement errors are almost non-existent when using the PEP terminal. This would suggest that the scatter is due to changing lake conditions. This past summer secchi depth and other ground truth measures were taken in a number of Wisconsin lakes on the same day as the ERTS overpass. A more reliable relationship between scene brightness and secchi depth should be available after data from this work has been analyzed. The similarity between densitometric-derived exposures and computer-derived exposures lends confidence to the densitometric measurement of all lakes greater than 100 acres in Wisconsin. When the new exposure versus secchi relationship is derived, secchi depth will be predicted for all lakes greater than 100 acres from the exposure values derived from the measure ments on the 70mm imagery. Time Series Analysis A time series analysis was performed to evaluate the variability of lake exposure as the algae growing season progresses through the summer.

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fullscreen: Proceedings of Symposium on Remote Sensing and Photo Interpretation (Volume 1)

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