XVIIIth Congress: Commission VI

Kraus, Karl; Waldhäusl, Peter

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Multivolume work

Persistent identifier:: 1667435949

Title:: XVIIIth Congress

Sub title:: Vienna, Austria 1996

Year of publication:: 1996

Place of publication:: Vienna

Publisher of the original:: Austrian Society of Surveying and Geoinformation

Identifier (digital):: 1667435949

Language:: English

Editor:: Kraus, Karl; Waldhäusl, Peter

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing

Document type:: Multivolume work

Volume

Persistent identifier:: 1677550198

Title:: Commission VI

Scope:: 149, 110, 92 Seiten

Year of publication:: 1996

Place of publication:: Vienna

Publisher of the original:: Austrian Society of Surveying and Geoinformation

Identifier (digital):: 1677550198

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(31,B6)

Language:: English

Additional Notes:: Die Vorlage enthält insgesamt 3 Werke: Commission VI (Seiten 1-149); National reports (Seiten 1-110); Special sessions (Seiten 1-92)

Other Title:: Enthaltendes Werk: National Reports; Enthaltendes Werk: Special sessions

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

Editor:: Kraus, Karl; Waldhäusl, Peter

Corporations:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Economic, Professional, and Educational Aspects of Photogrammetry and Remote Sensing

Adapter:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Economic, Professional, and Educational Aspects of Photogrammetry and Remote Sensing

Founder of work:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Economic, Professional, and Educational Aspects of Photogrammetry and Remote Sensing

Other corporate:: International Society for Photogrammetry and Remote Sensing, Congress, 18., 1996, Wien; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Economic, Professional, and Educational Aspects of Photogrammetry and Remote Sensing

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: Special Session

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: FOREST FIRES FROM SPACE: CONSIDERING SPATIAL AND TEMPORAL RESOLUTION. Dr. Emilio Chuvieco and David Cocero [...]

Document type:: Multivolume work

Structure type:: Chapter

fire risk assessment (both are related to pre-fire management), fire detection (during the fire), and fire effects assessment (post-fire). A brief description of the work carried out in these areas follows. 2. SHORT-TERM FIRE RISK MAPPING Better methods to evaluate the probability of fire out breaks would significantly reduce fire incidence by intensifying aerial or terrestrial vigilance, by forbidding certain risky activities or by adapting the level of alertness of fire suppression resources. Fire danger estimation demands frequent monitoring of vegetation stress. Vegetation moisture is a particularly difficult parameter to estimate as it accounts for little spectral variation with respect to other environmental factors (Cohen, 1991). However, spectral characterisation of vegetation stress is possible if temporal profiles are derived, and the contrast between living and dead components is emphasised. The most common methodology for the estimation of vegetation water stress has been the analysis of vegetation indices (VI) multitemporal series. VI has proven to be related to critical physiological variables, such as absorbed radiation (APAR), Green biomass or Leaf Area Index (LAI). Therefore, these VI provide a good indication of vegetation healthiness. On the other hand, decrements of VI are related to reduction of plant vigour and greenness which are also linked with vegetation moisture content (Paltridge and Barber, 1988). An alternative to the use of VI series for vegetation moisture estimation is to follow the thermal dynamism of the vegetation cover. Ratio of actual and potential evapotranspiration (LE/LEp) appears to be a good indicator of canopy water status. This index has been successfully applied to fuel moisture estimation from NOAA-AVHRR data (Vidal et al., 1994). A combination of surface temperature and NDVI has also been successfully applied to 46 fire danger estimation in the South of France (Prosper-Laget et al., 1994). 3. LONG-TERM FIRE RISK MAPPING Long-term risk refers to permanent factors associated to fire ignition or propagation, such as topography, vegetation structure, human activities or weather patterns. Therefore, the integration — capabilities of Geographic Information Systems (GIS) makes them a suitable tool for mapping fire risk. These maps are quite critical for a rational management of forest areas, since fire protection programs will be spatially and temporally oriented to the areas labelled as having high risk. Several GIS applications have been developed in the last decade to improve management of fire risk, specially to the generation of GIS- based risk maps. Most of these models are locally oriented, so they cover a small area at high resolution (typically from 50 to 100 meter grid size: Burgan and Shasby, 1984; Yool et al., 1985; Chuvieco and Congalton, 1989). However, there are also some experiences with global, low resolution, fire danger maps (Werth et al., 1985; McKinley et al., 1985). The critical point of these systems is the vegetation layer. Several studies have found a close correlation between the spread and intensity of the fire and fuel characteristics, such as size, plant moisture, compactness and density (Burgan and Rothermel, 1984). Several papers have explored the use of satellite remote sensing to generate these fuel models through digital image processing. Most have worked with Landsat-MSS or TM images (Salazar, 1982), but there are also interesting experiences using low resolution sensors like NOAA- AVHRR (Miller and Johnston, 1985). Finally, radar data can provide complementary information too for fuel mapping, particularly at local scale, since it is very sensitive to temporal and spatial variation of the canopy biomass. International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B6. Vienna 1996 Th the fol cri CIO (Ye dar Da Ch of | we anc loc for reg (CI Fir bas Coi con (Rc fire (mi the of (arc infr infr fire Fire mu Ear SP( frec met use] ima maj cyc whi

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fullscreen: Commission VI (Part B6)

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