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  • Spatial pattern  (1)
  • landscape pattern  (1)
  • rangelandcondition  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Mapping and analyzing landscape patterns (1994)
    Springer
    Landscape ecology 9 (1994), S. 7-23 
    Details
    ISSN: 1572-9761
    Keywords: landscape pattern ; land cover ; classification ; GIS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Landscapes were mapped as clusters of 2 or 3 land cover** types, based on their pattern within the clusters and tendency for a single type to dominate. These landscapes, called Landscape Pattern Types (LPTs), were combined with other earth surface feature data in a Geographic Information System (GIS) to test their utility as analysis units. Road segment density increased significantly as residential and urbanized land cover components increased from absent, to present as patch, to present as matrix (i.e., the dominant land cover type). Stream segment density was significantly lower in LPTs with an urbanized or residential matrix than in LPTs with either a forest or agriculture matrix, suggesting an inverse relationship between stream network density and the prevalence of human development other than agriculture in the landscape. The ratio of average forest patch size to total forest in the LPT unit decreased as agriculture replaced forest, then increased as residential and urban components dominated. Wetland fractal dimension increased as agriculture and residential land cover components of LPTs increased. Comparison of LPT and LUDA land cover area statistics in ecoregions suggested that land cover data alone does not provide information as to its spatial arrangement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00135075
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A note on contagion indices for landscape analysis (1996)
    Springer
    Landscape ecology 11 (1996), S. 197-202 
    Details
    ISSN: 1572-9761
    Keywords: Spatial pattern ; image texture ; information index ; computation ; statistics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The landscape contagion index measures the degree of clumping of attributes on raster maps. The index is computed from the frequencies by which different pairs of attributes occur as adjacent pixels on a map. Because there are subtle differences in the way the attribute adjacencies may be tabulated, the standard index formula may not always apply, and published index values may not be comparable. This paper derives formulas for the contagion index that apply for different ways of tabulating attribute adjacencies — with and without preserving the order of pixels in pairs, and by using two different ways of determining pixel adjacency. When the order of pixels in pairs is preserved, the standard formula is obtained. When the order is not preserved, a new formula is obtained because the number of possible attribute adjacency states is smaller. Estimated contagion is also smaller when each pixel pair is counted twice (instead of once) because double-counting pixel adjacencies makes the attribute adjacency matrix symmetric across the main diagonal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02071810
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  • 3
    Electronic Resource
    Electronic Resource
    Evaluating Change in Rangeland Condition using Multitemporal AVHRR Data and Geographic Information System Analysis (1999)
    Springer
    Environmental monitoring and assessment 59 (1999), S. 211-223 
    Details
    ISSN: 1573-2959
    Keywords: GIS ; multitemporal analysis ; NDVI ; rangelandcondition ; remote sensing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Coarse-scale, multitemporal satellite image data were evaluated as a tool for detecting variation in vegetation productivity, as a potential indicator of change in rangeland condition in the western U.S. The conterminous U.S. Advanced Very High Resolution Radiometer (AVHRR) biweekly composite data set was employed using the six-year time series 1989–1994. Normalized Difference Vegetation Index (NDVI) image bands for the state of New Mexico were imported into a Geographic Information System (GIS) for analysis with other spatial data sets. Averaged NDVI was calculated for each year, and a series of regression analyses were performed using one year as the baseline. Residuals from the regression line indicated 14 significant areas of NDVI change: two with lower NDVI, and 11 with higher NDVI. Rangeland management changes, cross-country military training activities, and increases in irrigated cropland were among the identified causes of change.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006126622200
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