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Preconcentration of phenanthrenequinone-like compounds for electrochemical determination at a carbon paste electrode via spontaneous adsorption (1982)

Cheng, H. Y. ; Falat, L. ; Li, R. L.

s.l. : American Chemical Society

Analytical chemistry 54 (1982), S. 1384-1388

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ISSN: 1520-6882

Quelle: ACS Legacy Archives

Thema: Chemie und Pharmazie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1021/ac00245a026

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Crop classification using airborne radar and LANDSAT data (1981)

Shanmugam, K. S. ; Li, R. Y. ; Ulaby, F. T.

In: CASI

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Publikationsdatum: 2019-06-28

Beschreibung: Airborne radar data acquired with a 13.3 GHz scatterometer over a test-site near Colby, Kansas were used to investigate the statistical properties of the scattering coefficient of three types of vegetation cover and of bare soil. A statistical model for radar data was developed that incorporates signal-fading and natural within-field variabilities. Estimates of the within-field and between-field coefficients of variation were obtained for each cover-type and compared with similar quantities derived from LANDSAT images of the same fields. The classification accuracy provided by LANDSAT alone, radar alone, and both sensors combined was investigated. The results indicate that the addition of radar to LANDSAT improves the classification accuracy by about 10; percentage-points when the classification is performed on a pixel basis and by about 15 points when performed on a field-average basis.

Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING

Materialart: E83-10255 , NASA-CR-171628 , SR-K1-04043 , NAS 1.26:171628 , RSL-TR-360-13

Format: application/pdf

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NASA TECHNICAL REPORTS

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Crop classification using airborne radar and Landsat data (1982)

Li, R. Y. ; Shanmugan, K. S. ; Ulaby, F. T.

In: Other Sources

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Publikationsdatum: 2019-06-28

Beschreibung: NASA 13.3 GHz airborne radar data from a soil moisture measurement analysis is used to investigate the statistical nature of the radar backscattering coefficient for bare ground and three different crop types, and to evaluate the crop classification rates using Landsat data alone or combined with the airborne survey. The scatterometer was a fan-beam Doppler system, VV polarized, and is considered only for 50 deg angles of incidence. A total of 36 fields were covered a week apart by the aircraft and Landsat, and Rayleigh statistics were used in the frequency averaging to eliminate fluctuations due to random fluctuations. Within-field variances were calculated for the Landsat and the radar data and used to design optimum crop classification procedures. The Landsat Band 4 readings were 67% accurate, and an increase in accuracy of 10% was achieved by the addition of the radar data.

Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING

Materialart: IEEE Transactions on Geoscience and Remote Sensing; GE-20; Jan. 198

Format: text

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Crop classification with a Landsat/radar sensor combination (1980)

Eyton, J. R. ; Li, R. Y. ; Ulaby, F. T.

In: Other Sources

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Publikationsdatum: 2019-07-13

Beschreibung: A combined Landsat/radar approach to classification of remotely sensed data, with emphasis on crops, was undertaken. Radar data were obtained by microwave radar spectrometers over fields near Eudora, Kansas and Landsat image data were obtained for the same test site. After Landsat digital images were registered and test-cells extracted, a comparable set of radar image pixels were simulated to match the Landsat pixels. The combined data set is then used for classification, and the results are examined with the best combination of sensor variables identified. Finally, the usefulness of radar in a simulated cloud-cover situation is demonstrated. The major conclusion derived from this study is that the combination of radar/optical sensors is superior to either one alone.

Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING

Materialart: Annual Symposium on Machine processing of remotely sensed data and soil information systems and remote sensing and soil survey; Jun 03, 1980 - Jun 06, 1980; West Lafayette, IN

Format: text

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