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

261 Densitométrie Analysis of 37 Lakes Using 70mm ERTS Imagery The primary goal of this study is to evaluate the usefulness of densitométrie analysis of ERTS photographic imagery as a tool for a periodic monitoring program of Wisconsin lakes for changes in water turbidity caused by the growth of phytoplanktonic algae. Thirty-seven lakes were selected for densitométrie analysis in each of the four ERTS bands. The location of these lakes, which range in fertility from extremely eutrophic lakes in southeastern Wisconsin to very clear oligo- trophic lakes in the northern part of the state, is shown on Map A. Eight different ERTS images were required to provide coverage of all 37 lakes. Secchi depth readings were selected as the ground truth measure of lake eutrophication to be correlated with lake exposure calculated from the ERTS image. Secchi depths and various other water quality para meters are sampled quarterly in these lakes as a part of the DNR Lake Water Quality Monitoring Program. The sampling date of each of these lakes was within 25 days of the ERTS overflight date.* In addition, each lake 1) had no tannin coloring, 2) was at least 20 feet deep to minimize bottom interference, 3) was large enough to insure that the measurement spot of the microdensitometer was wholly within the lake, and 4) was not obscured at all by clouds or atmospheric haze. A Gamma Scientific spot microdensitometer equipped with a digital readout photomultiplier-picoammeter combination was used for the measure ment of the transmitted intensity of light through the film. A measurement spot size diameter of 50 microns, which corresponds to 550 feet on the ground, was selected for the analysis of lake imagery. This is large enough to average across several of the pixels or resolution cells of the ERTS multispectral scanner which are about 200 feet across on the ground. A one millimeter measurement spot size was used for densitizing the film wedges on each of the ERTS images. The raw current readings output from the densitometer were used to calculate the transmittance of light through the transparency for the lake of interest. On any one frame, lake image transmittance might be expected to correlate with secchi depth. However, the transmittances of lakes on different frames are not comparable because of photographic processing differences. These processing differences can be normalized by using the film wedges provided on each frame to calculate the relative exposure of each lake. Relative exposure is proportional to the light energy hitting the ERTS multispectral scanners and is comparable from frame to frame. Each step on the film wedge was exposed during processing by an amount of For 30 of the lakes the sampling date was within 10 days of the ERTS overflight. The remaining lakes (sampled within 11-25 days) were included because they were all known to be oligotrophic and were not expected to show much variability in algal turbidity over time.

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