Remote Sensing of of Soils and Geomorphology. Soil Characteristics Soil is a mixture of inorganic mineral particles and organic matter of varying size.

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Presentation transcript:

Remote Sensing of of Soils and Geomorphology

Soil Characteristics Soil is a mixture of inorganic mineral particles and organic matter of varying size and composition. The particles make up about 50 percent of the soil’s volume. Pores containing air and/water occupy the remaining volume. Soil serves as the medium for growing plants.Soil is a mixture of inorganic mineral particles and organic matter of varying size and composition. The particles make up about 50 percent of the soil’s volume. Pores containing air and/water occupy the remaining volume. Soil serves as the medium for growing plants.

Standard Soil Profile

Factors Influencing Soil Reflectance mineral composition soil moisture organic matter content texture and roughness salinity

Soils: Mineral Composition Affects the visible, NIR, and thermal portions of the reflectance spectrum Increasing reflectance from visible to NIR Iron and clays are detectable

Basic Dry Soil Spectrum

Iron Oxide

Iron content in the Santa Monica mountains mapped using AVIRIS (Palacios-Orueta et al. 1999)

Soils: Organic Matter Content OM affects soil color, heat capacity, water holding capacity, nutrient exchange, structure, and erodability Dark color generally associated with high OM Landsat TM bands 5 and 6 have negative correlation with OM

Soil Organic Matter

Organic matter content in the Santa Monica mountains mapped using AVIRIS (Palacios-Orueta et al. 1999)

Soils: Texture Texture –%sand, %silt, %clay

Soil Texture Proportion of sand, silt and clay in a soil (or horizon), usually calculated as % weight for each type of particle These percentages are divided different soil texture classes

Basic Dry Soil Spectrum

Soil Moisture Liquid water absorbs sunlight The depths of the water absorption bands at 1.4, 1.9 and 2.7  m can be used to estimate soil moisture.

Soil Moisture and Texture Since clayey soil holds water more tightly than sandy soil, the water absorption features will be more prominent in clayey soils given the same amount of time since the last precipitation or watering

Soils: Moisture Content Theoretically, soil moisture is directly related to surface soil moisture content SAR estimates of soil moisture are also influenced by: –roughness –topography –vegetation density –salinity

Soil Moisture from RADAR Higher dielectric constants (more moisture) yields higher RADAR backscatter. Melfort, Saskatchewan, Canada, ERS-1: Rainfall fell on the area in the lower half of the image but not on the upper half.

Soil Moisture from Thermal Sensors Water has a higher thermal capacity than soil and rock. Moist soils will change in temperature more slowly than dry soils Apparent thermal inertia can be used to distinguish dry from moist soils

Soil Moisture from Thermal Sensors Daedalus thermal image (night time). If we had a daytime image to compare it to, we could see the amount of change in temperature and make inferences on the soil moisture content (less change = more moisture).

Geomorphology from Remote Sensing Landforms: erosion and deposition by various processes –Eolian (wind) –Igneous (volcanic) –Tectonic (crustal motion) –Karstic (limestone erosion) –Fluvial (rivers) –Shoreline (ocean and rivers) –Glacial

Landforms: Patterns and Processes Landforms are typically identified by shape, not spectral properties Shadows and height differences help to identify features

Eolian landforms crescentic dunes from ASTER star dunes from Landsat TM

Igneous landforms Mount Rainier, Washington stratovolcano

Tectonic Landforms Landsat TM image of Nevada basin and range region

Karstic Landforms Karst topography develops by chemical dissolution of limestone rocks Creates caves, sinkholes, solution valleys, towers, pitted landscapes Landsat TM image of Guangxi province, China (karst areas are dark) photo of karstic towers in Guangxi, province China

Fluvial Landforms Radar image of dendritic river network in east-central Colombia

Lower Mississippi River Floodplain

Shoreline Landforms MISR image of Mississippi Delta (birdsfoot delta)

Glacial Landforms ASTER image of receding glaciers in Bhutan (note lakes forming at glacier termini)