Proceedings of the Symposium on Global and Environmental Monitoring: Proceedings of the Symposium on Global and Environmental Monitoring

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Multivolume work

Persistent identifier:: 856665355

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts ; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856665355

Language:: English

Document type:: Multivolume work

Volume

Persistent identifier:: 856669164

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Scope:: XIV, 912 Seiten

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856669164

Illustration:: Illustrationen, Diagramme, Karten

Signature of the source:: ZS 312(28,7,1)

Language:: English

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

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:: [TP-4 SOILS]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: SOIL SALINITY ESTIMATION IN SOUTHERN ALBERTA USING RADAR DATA. C. A. Hutton, R. J. Brown, M. G. Lowings

Document type:: Multivolume work

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120 SOIL SALINITY ESTIMATION IN SOUTHERN ALBERTA USING RADAR DATA C.A. Hutton INTERA KENTING 1525 Carling Ave. Ottawa, Ontario R.J. Brown Canada Centre for Remote Sensing 1547 Merivale Rd. Ottawa, Ontario M.G. Lowings Polar Sea Research 204, 740 - 4 Avenue South Lethbridge, Alberta Soil salinity is an increasing problem in the Canadian prairies. Irrigation, in addition to many popular farming practices such as summerfallowing have increased and intensified the problem. Since land reclamation is difficult and expensive remote sensing offers a potential tool with which to monitor the problem and allow more accurate and timely remedial measures. Since areas of salinity will move, shift, be introduced or increase in severity, as changes occur in the rainfall and groundwater patterns, an adequate monitoring method becomes critical. Previous efforts to identify saline soils with VIR data have indicated some intermediate to mature saline seeps can be detected by salt crusting or identification of indicator plant species. (Chaturvedi, L., et al., 1983; Dalsted, K.J., 1979) Since, SAR offers a unique interaction with ground targets, the potential for identification of saline areas and their severity is unknown. SAR data was acquired over an area surrounding the town of Warner, in southern Alberta to assess its potential for mapping and monitoring salinity. The objectives of the present work were to assess 1) the capability of SAR data for saline area identification and 2) determine the potential for mapping the severity of these areas. C and X-Band narrow mode HH data was acquired in July while both HH and VV were collected in October of 1989. The July data were analyzed to locate saline areas through varied backscatter related to salt crusts (or chemical variations in the soil) or differing dielectric constants which might indicate less severe areas. In vegetated areas a reduction in crop health, identified through reduced backcscatter, hopefully will correlate with salinity. Using the October data set, collected after harvest, the indicators of salt crusting were assessed in addition to the location of two saline indicator plant species Kochia and Foxtail. Due to the absence of other vegetative growth (crops) these plant species were felt to be a means of determining saline areas. The methodology of combining the poor growth areas on the July imagery with regions with indicator species was developed as a means of saline identification. The C and X-Band data were used both to compare the information found with each frequencies and determine a preferred frequency or combined frequency for mapping. Also, HH and VV were both assessed addressing any polarization dependence that might occur. A number of preprocessing tasks were carried out in preparation of this data analysis. The data were radiometrically corrected to remove the antenna pattern effects and were filtered with a 5x5 median filter to remove the speckle. The data were stretched to fill the entire dynamic range or enhanced to provide the greatest visual contrast between the features on these images. Negatives were created from these data and reproduced photographically at an enlarged scale for use in the analysis. The analysis was conducted qualitatively in the first stages using photo interpretation but will be expanded to include digital methods at a later data. A SUN system running the PCI EASI/PACE software, was used to carry out the preprocessing. A Compaq-base EASI/PACE package and a PAMAP GIS package was used to conduct the mapping portions of this experiment. A map was produced identifying the crop types and medium and severe saline areas. The salinity information was digitized from a Soil survey of the County Warner, Alberta, 1984. Using the saline map and field overlay, the ability to identify these known saline areas were determined. The factors influencing the radar backscatter such as crop type, topography and hopefully salinity were assessed. The regions of known salinization were assessed to determine whether the SAR could identify these and map any changes which have occurred. Outputs from the analysis will include maps indicating saline areas derived from the SAR imagery and, SAR/VIR imagery in combination. The mapping potential of the SAR data set in reference to frequency, polarization, incidence angle and date are discussed. REFERENCES Chaturvedi, L., K.R. Carver, J.C. Harlan, G.D. Hancock, F.V. Small and K.J. Dalstead, 1983, "Multispectral Remote Sensing of Saline Seeps", IEEE Transactions on Geoscience and Remote Sensing, Vol. GE-21. No. 3, pp 239-250.

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