Euro-Mediterranean Wildland Fire Laboratory, a “wall-less” Laboratory for Wildland Fire Sciences and Technologies in the Euro-Mediterranean Region Deliverable D-08-01 Hyperspectral camera: its principles and rules of use
نویسندگان
چکیده
SUMMARY A hyperspectral camera has been acquired by the Department of Geography of the University of Alcalá. The system has been manufactured by Specim (www.specim.fi) at Oulu, Finland. The hyperspectral camera is composed of an ImSpector N17, a SU320-1.7TR NIR CCD camera, a spinning mirror installed in order to scan a 2 dimensional target and a fibre optic downwelling irradiance sensor (FODIS). The FODIS data is used to normalised radiance and derive from that the reflectance. The hyperspectral camera measures 320 pixels in the across scanning direction. The field of view (FOV) in this direction is 24° in total, which results in 0.075° per pixel. In the along track direction the number of pixels is variable. It may vary from 1 to around 500 pixels depending on the application characteristics. Spectral range covered by the hyperspectral camera is from 900 to 1750 nm with a full width at half maximum (FWHM) of 4.5 nm. The hyperspectral camera accuracy has been tested with an Opdima and a Labsphere Spectralon TM white reference panels, showing good results. Hyperspectral measurements of rare earths have been compared with " true " reflectance values from Labsphere. Results show very good agreement regarding the position of the absorption bands. Absolute reflectance values were overestimated by our hyperspectral camera due to the illumination conditions. The hyperspectral camera will be used in forest fire research mainly to estimate fuel moisture content (FMC) as a critical variable in fire danger rating. Additionally, it will be tested to discriminate fire severity levels in experimental fires.
منابع مشابه
مطالعۀ فلوریستیکی مراتع درمنۀ کوهی در استان اصفهان، ایران
To investigate the Artemisia vegetation in Isfahan Province, two rangelands of Khorous Galu in the southwest and Ashan in the west of Isfahan were selected. These rangelands are mountainous with semiarid climate. In Khorous galu, 68 species belonging to 50 genera and 24 families were identified. Life forms included hemicryptophytes (39%), therophytes (27.5%), chamaephytes (19%), geophytes (13%)...
متن کاملPrehistoric fire area and emissions from California’s forests, woodlands, shrublands, and grasslands
In the majority of US political settings wildland fire is still discussed as a negative force. Lacking from current wildfire discussions are estimates of the spatial extent of fire and their resultant emissions before the influences of Euro-American settlement and this is the focus of this work. We summarize the literature on fire history (fire rotation and fire return intervals) and past Nativ...
متن کاملReducing the Wildland Fire Threat to Homes: Where and How Much?
Understanding how ignitions occur is critical for effectively mitigating home fire losses during wildland fires. The threat of life and property losses during wildland fires is a significant issue for Federal, State, and local agencies that have responsibilities involving homes within and adjacent to wildlands. Agencies have shifted attention to communities adjacent to wildlands through presupp...
متن کاملA territorial fire vulnerability model for Mediterranean ecosystems in South America
a r t i c l e i n f o Keywords: Fire risk Risk map Danger Damage potential Urban–wildland interface zone A forest fire risk model was designed and applied to a South American Mediterranean ecosystem, taking into consideration three analysis groups: fire risk; danger of fire spread, or propagation; and damage potential over economic threat values. The study area for development and validation of...
متن کامل