Detection and mapping of burnt areas from time series of MODIS-derived NDVI data in a Mediterranean region

Moderate resolution remote sensing data, as provided by MODIS, can be used to detect and map active or past wildfires from daily records of suitable combinations of reflectance bands. The objective of the present work was to develop and test simple algorithms and variations for automatic or semiautomatic detection of burnt areas from time series data of MODIS biweekly vegetation indices for a Mediterranean region. MODIS-derived NDVI 250m time series data for the Valencia region, East Spain, were subjected to a two-step process for the detection of candidate burnt areas, and the results compared with available fire event records from the Valencia Regional Government. For each pixel and date in the data series, a model was fitted to both the previous and posterior time series data. Combining drops between two consecutive points and 1-year average drops, we used discrepancies or jumps between the pre and post models to identify seed pixels, and then delimitated fire scars for each potential wildfire using an extension algorithm from the seed pixels. The resulting maps of the detected burnt areas showed a very good agreement with the perimeters registered in the database of fire records used as reference. Overall accuracies and indices of agreement were very high, and omission and commission errors were similar or lower than in previous studies that used automatic or semiautomatic fire scar detection based on remote sensing. This supports the effectiveness of the method for detecting and mapping burnt areas in the Mediterranean region.

Global 2009 1km MODIS (MOD35/MOD09) cloud frequency and MOD35 processing path

Identifying cloud interference in satellite-derived data is a critical step toward developing useful remotely sensed products. Most MODIS land products use a combination of the MODIS (MOD35) cloud mask and the 'internal' cloud mask of the surface reflectance product (MOD09) to mask clouds, but there has been little discussion of how these masks differ globally. We calculated global mean cloud frequency for both products, for 2009, and found that inflated proportions of observations were flagged as cloudy in the Collection 5 MOD35 product. These erroneously categorized areas were spatially and environmentally non-random and usually occurred over high-albedo land-cover types (such as grassland and savanna) in several regions around the world. Additionally, we found that spatial variability in the processing path applied in the Collection 5 MOD35 algorithm affects the likelihood of a cloudy observation by up to 20% in some areas. These factors result in abrupt transitions in recorded cloud frequency across landcover and processing-path boundaries impeding their use for fine-scale spatially contiguous modeling applications. We show that together, these artifacts have resulted in significantly decreased and spatially biased data availability for Collection 5 MOD35-derived composite MODIS land products such as land surface temperature (MOD11) and net primary productivity (MOD17). Finally, we compare our results to mean cloud frequency in the new Collection 6 MOD35 product, and find that landcover artifacts have been reduced but not eliminated. Collection 6 thus increases data availability for some regions and land cover types in MOD35-derived products but practitioners need to consider how the remaining artifacts might affect their analysis.

MODIS : moderate resolution imaging spectroradiometer /

Mode of access: Internet.

Aduersus nouam Marci Beneuentani astronomia[m] : quae positionem Alphonsinam, ac rece[n]tiorum omniu[m], de motu octaui orbis multis modis deprauauit, & secu[m] pugnatem fecit : Alberti Pighii Campensis Apologia, in qua, tota ferme Alphonsina positio, hactenus a paucissimis recte intellecta, a Purbachio etiam in multis perpera[m] explicata, mathematice demonstrata est ; Breuis & luculenta enarratio Alphonsinae positionis per eundem ; eiusdem, Quo possit ingenio Alphonsinarum tabularum abacus referri ad ecliptica[m] mobilem octauae sphaerae, a puncto vernalis aequinoctij facto supputationis initio, Thebitianarum tabularum instar, succincta explanatio

Mode of access: Internet.

De anima disputationes quatuor : ubi natura illius, proprietates, modis operandi, vitales que operationes ... exponuntur ... /

Mode of access: Internet.

Decades quinque principiorum seu regularum pro intelligentiae Sacrae Scripturae sive Super modis loquendi Sacrae Scripturae ... /

Mode of access: Internet.

Tractatus de conditionibus et modis impossibilibus, ac iure prohibitis contractibus, [et] testamentis adscriptis / auctore Paulo Duran, episcopo Vrgellensi et nuper S. Rotae Romanae auditore

Mode of access: Internet.

Troiani herois Aeneae iter ad Elysium, carmen allegoricum musicis modis concinnatum, & dictum, dum Benedictus Pamphilius faustissimis, sanctissimisque auspicijs Innocentii XI pont. max. philosophica, ac theologica laurea in Romano Societatis Iesu Collegio donaretur

Mode of access: Internet.

Joa. Simonis ... Lexicon manuale hebraicum et chaldaicum in Veteris Testamenti libros, post Joa. Godofr. Eichhornii curas, denuo castigavit, emendavit, multisque modis auxit Georg. Benedict. Winer.

Mode of access: Internet.

De omnigena hominis nobilitate libri IV : quêis pertractantur quae ad usum & utilitatem de nobilitate hominis naturali, tum corporis tum animae (hujusque vera origine, substantia & immortalitate), deque morali, politica, gentilitia, educatione & institutione nobilis & ingenuae jnventutis [sic], modis acquirendi, probandi, traducendi, defendendi, conservandi, condecorandi, augendi, obscurandi, amittendi nobilitatem : digesti ex jure divino, canonico, civili, feudali, publico, scriptoribus ecclesiasticis, ethicis, juridicis, historicis ac politicis /

Includes index.

Historia s. Petri persice conscripta, simulque multis modis contaminata. Latine reddita, & brevibus animadversionibus notata,

"Narratio brevis rervm à Societate in regno magni Mogor gestarum, transcripta ex literis p. Hieronymi Xavier Societatis Iesv, anni 1598. & p. Emmanyelis Pigneiro, anni 1598.": p. 122-144.

Tractatus de variis passionem domini nostri Jesu Christi meditandi modis : ad fidelium Christi utilitatem conscriptus /

Engraved t.-p.

Multi-year Trends in MODIS and MISR Observed Cloud Fraction over the Extratropical Oceans

Thesis (Master's)--University of Washington, 2016-06