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The identification of clear-sky and cloudy pixels is a key step in the processing of satellite observations. This is equally important for surface and cloud-atmosphere applications. In this paper, the Separation of Pixels Using Aggregated Rating over Canada (SPARC) algorithm is presented, a new method of pixel identification for image data from the Advanced Very High Resolution Radiometer (AVHRR) on board the NOAA satellites. The SPARC algorithm separates image pixels into clear-sky and cloudy categories based on a specially designed rating scheme. A mask depicting snow/ice and cloud shadows is also generated. The SPARC algorithm has been designed to work year-round (day and night) over the temperate and polar regions...
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1.?Mixed-wood boreal forests are often considered to undergo directional succession from shade-intolerant to shade-tolerant species. It is thus expected that overstorey gaps should lead to the recruitment of shade-tolerant conifers into the canopy in all stand development stages and that the recruitment of shade-intolerant hardwoods would be minimal except in the largest gaps. 2.?We analysed short-term gap dynamics over a large 6-km2 spatial area of mixed-wood boreal forest across a gradient of stands in different developmental stages with different times of origin since fire (expressed as stand ?age?) that were affected differentially by the last spruce budworm (SBW) outbreak. Structural measurements of the canopy...
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The evolution of permafrost in cold regions is inextricably connected to hydrogeologic processes, climate, and ecosystems. Permafrost thawing has been linked to changes in wetland and lake areas, alteration of the groundwater contribution to streamflow, carbon release, and increased fire frequency. But detailed knowledge about the dynamic state of permafrost in relation to surface and groundwater systems remains an enigma. Here, we present the results of a pioneering 1,800 line-kilometer airborne electromagnetic survey that shows sediments deposited over the past 4 million years and the configuration of permafrost to depths of 100 meters in the Yukon Flats area near Fort Yukon, Alaska. The Yukon Flats is near the...
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This paper discusses the application of digital terrain analysis modeling techniques to the parameterization of a semi-distributed hydrologic model. Most current techniques for deriving physiographic parameters in watershed analyses, including those using commercial geographic information systems (GIS), are tedious, costly and time consuming. The demands of these techniques result in them usually being limited in practical application to deriving parameters at only one level of detail or for only one set of sub-basins. This paper presents a computerized interface (SLURPAZ) that was developed to combine the output of an established digital terrain analysis model (TOPAZ) with digital land cover data to derive all...
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We present a comprehensive approach to carry out community-wide assessments of in situ conservation of forest trees based on basic botanical and ecological data. This is a first step, resulting in a consistent framework to set priorities for collection and inclusion of species- specific biological and genetic information. We use botanical sample data to generate high-resolution distribution maps as a basis for a gap analysis of how well each species is represented in protected areas. To account for adaptive genetic variation of tree species we stratify populations by ecological zones that represent different macroclimates. In a detailed example for Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), we show that...
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a wide range of people and groups have interests in the Peel River watershed, from community people who rely on the watershed for drinking water, big game outfitters and tourism operators who guide here, trappers who use trap-lines, members of the public who pursue outdoor recreation activities, conservationists who seek the protection of important ecological areas, to businesses and industries that seek to explore for oil, gas and mineral resources or pursue other economic activities. It is important that this wide range of interests be considered when developing a land use and conservation plan. Although lots of information exists for some aspects of the Peel watershed, others are not nearly as well known. This...


map background search result map search result map Denali National Park and Preserve Landcover Mapping Project Volume 1: Remote Sensing Data, Procedures and Results Interactions of multiple disturbances in shaping boreal forest dynamics: a spatially explicit analysis using multi-temporal lidar data and high-resolution imagery Airborne electromagnetic imaging of discontinuous permafrost Kanuti NWR/Ray Mountains/Hogatza River earth cover classification Peel watershed atlas [conservation values and land use in the Peel River watershed]: a working draft atlas of physical, biological and cultural features of the Peel River watershed Evaluating GCM outputs for past climates in North America based on the distribution of Sphagnum peatlands An ecogeographic framework for in situ conservation of forest trees in British Columbia Use of remote sensing to identify areas of groundwater upwelling on active glacial floodplains: Their frequency, extent and significance on a landscape scale Using digital terrain analysis modeling techniques for the parameterization of a hydrologic model Application of time-lapse digital imagery for ground-truth verification of satellite indices in the boreal forests of Alaska A test of detecting spring leaf flush within the Alaskan boreal forest using ERS-2 and Radarsat SAR data Denali National Park and Preserve Landcover Mapping Project Volume 2: Landcover classes and plant associations A test of detecting spring leaf flush within the Alaskan boreal forest using ERS-2 and Radarsat SAR data Kanuti NWR/Ray Mountains/Hogatza River earth cover classification Denali National Park and Preserve Landcover Mapping Project Volume 1: Remote Sensing Data, Procedures and Results Denali National Park and Preserve Landcover Mapping Project Volume 2: Landcover classes and plant associations Airborne electromagnetic imaging of discontinuous permafrost Use of remote sensing to identify areas of groundwater upwelling on active glacial floodplains: Their frequency, extent and significance on a landscape scale Peel watershed atlas [conservation values and land use in the Peel River watershed]: a working draft atlas of physical, biological and cultural features of the Peel River watershed Application of time-lapse digital imagery for ground-truth verification of satellite indices in the boreal forests of Alaska Using digital terrain analysis modeling techniques for the parameterization of a hydrologic model An ecogeographic framework for in situ conservation of forest trees in British Columbia Interactions of multiple disturbances in shaping boreal forest dynamics: a spatially explicit analysis using multi-temporal lidar data and high-resolution imagery Evaluating GCM outputs for past climates in North America based on the distribution of Sphagnum peatlands