323 research outputs found

    Land cover map 2007: using OBIA for LCM2007

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    Land cover map 2007 (LCM2007) is an object-based land cover map for the UK containing around 10 million objects. The LCM2007 spatial framework is based on the generalisation of national cartography products (OS MasterMap for Great Britain and Ordnance Survey Northern Ireland for NI). 34 composite images (based on summer and winter data) were classified using a maximum likelihood classifier. Areas where composite data were not available were filled with classifications from single-date data. A set of knowledge-based enhancements (KBEs) were then applied to refine the classification using ancillary data sets, including soil and altitude data. The final product showed a correspondence of 83%, when compared to 9127 ground reference polygons. A range of LCM2007 data products are available ranging from the full vector data set, with 10 attributes per polygon, to a 25m raster data set and a series of 1km raster products

    Flying

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    The milliped genus Euryurus Koch, 1847 (Polydesmida: Euryuridae) west of the Mississippi River; occurrence of E. leachii (Gray, 1832) on Crowley’s Ridge, Arkansas

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    The milliped genus Euryurus Koch, 1847, and the species, E. leachii (Gray, 1832) (Polydesmida: Euryuridae), are recorded from three sites on the northern part of Crowley’s Ridge (Cross, Lee, and Poinsett counties), Arkansas, where the only prior familial records are of Auturus evides (Bollman, 1887). Coupled with the published locality of E. leachii in Phillips Co., at the southern extremity of the Ridge, the only known occurrences of both the genus and species in Arkansas and west of the Mississippi River are in this physiographic feature. The Arkansas population is geographically peripheral but anatomically intermediate between the two recognized subspecies, E. l. leachii and E. l. fraternus Hoffman, 1978, and we do not assign it to a race. Molecular investigations seem necessary to resolve relationships in the “E. leachii complex.

    Distribution of \u3ci\u3eAbacion texense\u3c/i\u3e (Loomis, 1937), the only milliped species traversing the Rio Grande, Mississippi, and Pecos rivers (Callipodida: Abacionidae)

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    Localities are documented for the milliped Abacion texense (Loomis, 1837) (Callipodida: Abacionidae) whose distribution forms both the northern and southern ordinal limits in the Western Hemisphere. The westernmost component of Abacion Rafinesque, 1820, A. texense is the only milliped species whose range spans the Mississippi and Pecos rivers and the Rio Grande. Distribution extremes are in Hennepin County (Co.), Minnesota, in the north; Terrell and Potter cos., Texas, in the west; Alcorn Co., Mississippi, in the east; and southwestern Tamaulipas, Mexico, in the south. Occurrences are projected for southeastern South Dakota, northwestern Alabama, and the southwestern periphery of Tennessee. The type series of A. texense consists solely of the male holotype, so a neotype will be needed if this individual is ever lost, because no paratypes were officially designated

    Millipeds (Arthropoda: Diplopoda) of the Ark-La-Tex. I. New Distributional and State Records for Seven Counties of the West Gulf Coastal Plain of Arkansas

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    Unlike the Diplopoda of the Ozark Mountains region of north Arkansas, the millipeds of the West Gulf Coastal Plain of the state are poorly known. During the winter months of 2001-2002, we collected millipeds in four counties (Hempstead, Lafayette, Little River, and Miller) of southwest Arkansas and three counties (Columbia, Nevada, and Ouachita) of south Arkansas. We found the following species/subspecies Eurymerodesmus dubuis and Pseudopolydesmus pinetorum from Hempstead County; E. birdi birdi, E. mundus, Oxidus gracilis, and Pseudopolydesmus ? minor from Lafayette County; Aniulus (Hakiulus) diversifrons diversifrons, P. pinetorum, and a possible new species of Tiganogona in Little River County; Abacion ? texense, E. Mundus, 0. gracilis, P. pinetorum, Thrinaxoria lampra, and a new species of Aniulus (Hakiulus) from Miller County; Auturus louisianus louisianus, E. dubuis, Cambala minor, O. gracilis, P. pinetorum, and a female xystodesmid of the tribe Pachydesmini from Columbia County; Virgoiulus minutus, C. minor, P. pinetorum, and A. l. louisianus from Nevada County; and P. pinetorum, Eurymerodesmus sp., Narceus americanus, and C. minor from Ouachita County. A new state record is documented for T. lampra from Miller County, and the finding of V. minutus in Miller and Nevada counties represents the southwesternmost distributional records for the genus and species. To our knowledge, all millipeds reported herein for Little River County are the first ever documented for that county, including a potentially new species of Tiganogona, a genus known previously from Carroll, Clay, Sebastian, and Washington counties, Arkansas, Lincoln Parish, Louisiana, and more distant locales in Missouri and Indiana

    Millipeds (Arthropoda: Diplopoda) of the Ark-La-Tex. II. Distributional Records for Some Species of Western and Central Arkansas and Easter and Southeastern Oklahoma

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    We collected millipeds between November 2001 and March 2002 at several sites in the Ouachita Provinces of western (Garland, Hot Spring, Pike, and Polk counties) and central Arkansas (Pulaski County) and the Ouachita and Kiamichi Provinces of southeastern Oklahoma (LeFlore and McCurtain counties). The following millipeds were found: Eurymerodesmus dubius, Auturus louisianus louisianus, Pseudopolydesmus pinetorum, and Cambala minor in Garland County; Eurymerodesmus sp., A. I. louisianus, P. pinetorum, and juveniles of the family Parajulidae (tribe Aniulini) from Hot Spring County; E. dubius, A. I. louisianus, and juveniles of the family Cleidogonidae from Pike County; Brachycybe lecontei, A. I. louisianus, Abacion tesselatum, and P. pinetorum in Polk County; Eurymerodesmus pulaski, P. pinetorum, Auturus evides, C. minor, B. lecontei, and a possible new species of Cleidogona in Pulaski County; A. I. louisianus, Apheloria virginiensis ?reducta, P. pinetorum, Narceus americanus, and E. dubius in McCurtain County; and B. lecontei, A.l. louisianus, Eurymerodesmus b. birdi, A. Ptesselatum, and juveniles of the family Parajulidae (tribe Aniulini) in LeFlore County. Two new state records are documented for Oklahoma: B. lecontei (Platydesmida: Andrognathidae), a record not only for the genus and species but also for the family and order; and E. dubius, the westernmost locality ever reported for the species
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