Radiometric and Geometric Correction of Tm-Data of Mountainous Forested Areas

Itten, K.I.; Meyer, P.; Kellenberger, Tobias; Leu, R.; Sandmeier, Stefan; Bitter, Peter H. von

doi:10.1109/igarss.1992.578660

Cited by 19 publications

(23 citation statements)

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“…We used a LIDAR‐based 1.8‐m DEM (Terrapoint 2003) and KH‐4B satellite specifications from declassified documents (McDonald 1995) to model the terrain and satellite position during orthorectification. Pre‐processing procedures were employed to remove systematic errors from the DEM (Keqi et al 2003; Rottensteiner et al 2005) and the Minnaert correction was used to mitigate radiometric variability from the imagery, which is common in mountainous areas (Itten & Meyer 1993).…”

Section: Methodsmentioning

confidence: 99%

Post‐fire tree establishment patterns at the alpine treeline ecotone: Mount Rainier National Park, Washington, USA

Stueve

Cerney

Rochefort

et al. 2009

J Vegetation Science

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Questions: Does tree establishment: (1) occur at a treeline depressed by fire, (2) cause the forest line to ascend upslope, and/or (3) alter landscape heterogeneity? (4) What abiotic and biotic local site conditions are most important in structuring establishment patterns? (5) Does the abiotic setting become more important with increasing upslope distance from the forest line? Location: Western slopes of Mount Rainier, USA. Methods: We performed classification analysis of 1970 satellite imagery and 2003 aerial photography to delineate establishment. Local site conditions were calculated from a LIDAR‐based DEM, ancillary climate data, and 1970 tree locations in a GIS. We used logistic regression on a spatially weighted landscape matrix to rank variables. Results: Considerable establishment after 1970 caused forest line elevation to increase over 150 m in specific locations. Landscape heterogeneity increased with distance from the 1970 forest line. At a broad spatial context, we found establishment was most common near existing trees (0‐50 m) and at low elevations (1250‐1350 m). Slope aspect (W, NW, N, NE, and E), slope angle (40‐60°), and other abiotic factors emerged as important predictors of establishment with increasing upslope distance from the forest line to restricted spatial extents. Conclusions: Favorable climatic conditions likely triggered widespread tree establishment. Readily available seed probably enhanced establishment rates near sexually mature trees, particularly in the less stressful environment at low elevations. The mass effect of nearly ubiquitous establishment in these areas may have obscured the importance of the abiotic setting to restricted spatial extents. Topographic variability apparently produced favorable sites that facilitated opportunistic establishment with increasing upslope distance from the forest line, thereby enabling additional trees to invade the alpine tundra.

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Section: Methodsmentioning

confidence: 99%

Post‐fire tree establishment patterns at the alpine treeline ecotone: Mount Rainier National Park, Washington, USA

Stueve

Cerney

Rochefort

et al. 2009

J Vegetation Science

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“…We applied calibration coefficients to estimate at-satellite radiance (Chander et al 2004) and a modified 5S radiative transfer model that incorporates a terrain-dependent illumination correction (Radeloff et al 1997) to calculate surface reflectance. To prevent overcorrection in areas of low illumination, the Minnaert constant (Itten and Meyer 1993) was set to 0.75 for the October image. Comparison of neighboring spectra from shaded and unshaded hillsides and visual assessments confirmed successful atmospheric and topographic correction.…”

Section: Preprocessing Of Landsat Tm and Etmþ Datamentioning

confidence: 99%

Post-Socialist Forest Disturbance in the Carpathian Border Region of Poland, Slovakia, and Ukraine

Kuemmerle

Hostert

Radeloff

et al. 2007

Ecological Applications

129

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Forests provide important ecosystem services, and protected areas around the world are intended to reduce human disturbance on forests. The question is how forest cover is changing in different parts of the world, why some areas are more frequently disturbed, and if protected areas are effective in limiting anthropogenic forest disturbance. The Carpathians are Eastern Europe's largest contiguous forest ecosystem and are a hotspot of biodiversity. Eastern Europe has undergone dramatic changes in political and socioeconomic structures since 1990, when socialistic state economies transitioned toward market economies. However, the effects of the political and economic transition on Carpathian forests remain largely unknown. Our goals were to compare post-socialist forest disturbance and to assess the effectiveness of protected areas in the border triangle of Poland, Slovakia, and Ukraine, to better understand the role of broadscale political and socioeconomic factors. Forest disturbances were assessed using the forest disturbance index derived from Landsat MSS/TM/ETM+ images from 1978 to 2000. Our results showed increased harvesting in all three countries (up to 1.8 times) in 1988-1994, right after the system change. Forest disturbance rates differed markedly among countries (disturbance rates in Ukraine were 4.5 times higher than in Poland, and those in Slovakia were 4.3 times higher than in Poland), and in Ukraine, harvests tended to occur at higher elevations. Forest fragmentation increased in all three countries but experienced a stronger increase in Slovakia and Ukraine (approximately 5% decrease in core forest) than in Poland. Protected areas were most effective in Poland and in Slovakia, where harvesting rates dropped markedly (by nearly an order of magnitude in Slovakia) after protected areas were designated. In Ukraine, harvesting rates inside and outside protected areas did not differ appreciably, and harvests were widespread immediately before the designation of protected areas. In summary, the socioeconomic changes in Eastern Europe that occurred since 1990 had strong effects on forest disturbance. Differences in disturbance rates among countries appear to be most closely related to broadscale socioeconomic conditions, forest management practices, forest policies, and the strength of institutions. We suggest that such factors may be equally important in other regions of the world.

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“…The magnitude of these effects varies as a function of solar inclination and azimuth as well as slope incline and aspect [51,52]. In the mountainous regions of our study area, these effects are particularly pronounced at Eifel, Hunsrück, and Westerwald, where major morphological features extend almost orthogonally to the illumination azimuth (see Figure 1).…”

Section: Atmospheric Correctionmentioning

confidence: 91%

Satellite-Based Derivation of High-Resolution Forest Information Layers for Operational Forest Management

Stoffels

Hill

Sachtleber

et al. 2015

Forests

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A key factor for operational forest management and forest monitoring is the availability of up-to-date spatial information on the state of forest resources. Earth observation can provide valuable contributions to these information needs. The German federal state of Rhineland-Palatinate transferred its inherited forest information system to a new architecture that is better able to serve the needs of centralized inventory and planning services, down to the level of forest districts. During this process, a spatially adaptive classification approach was developed to derive high-resolution forest information layers (e.g., forest type, tree species distribution, development stages) based on multi-temporal satellite data. This study covers the application of the developed approach to a regional scale (federal state level) and the further adaptation of the design to meet the information needs of the state forest service. The results confirm that the operational requirements for mapping accuracy can, in principle, be fulfilled. However, the state-wide mapping experiment also revealed that the ability OPEN ACCESSForests 2015, 6 1983 to meet the required level of accuracy is largely dependent on the availability of satellite observations within the optimum phenological time-windows.

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Radiometric and Geometric Correction of Tm-Data of Mountainous Forested Areas

Cited by 19 publications

References 1 publication

Post‐fire tree establishment patterns at the alpine treeline ecotone: Mount Rainier National Park, Washington, USA

Post‐fire tree establishment patterns at the alpine treeline ecotone: Mount Rainier National Park, Washington, USA

Post-Socialist Forest Disturbance in the Carpathian Border Region of Poland, Slovakia, and Ukraine

Satellite-Based Derivation of High-Resolution Forest Information Layers for Operational Forest Management

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