Viewshed analysis using remote sensing and geographic information systems. Fracamarea weighted mean patch fractal dimension area weighted mean value of the fractal dimension values of all patches, the fractal dimension of a patch equals two times the logarithm of patch perimeter m divided by the logarithm of patch area m2. Areabased initiative definition of areabased initiative. In order to choose the index with intercomplementary ecological meaning, we choose two landscape indices from two perspectives, area weighted mean patch fractal dimension awmpfd from patch attributes and core area percentage of landscape cpl from spatial heterogeneity, to analyze the spatial fragmentation pattern of forest in the study area. Look up the glossary for more information on these indices. Shannons evenness index areaweighted mean patch fractal dimension simpsons evenness index mean nearestneighbor distance modified simpsons evenness index. Ppt teaching with technology powerpoint presentation free. Area weighted mean patch fractal dimension fracam metrics. Therefore, caution should be exercised when using this fractal dimension index as a measure of patch shape complexity. Fractal dimension index is appealing because it reflects shape complexity across a range of spatial scales patch sizes. Description and comparison of geologic maps with fragstats. Spatiotemporal pattern of urban growth in jos metropolis. The relationship of an increasing fractal dimension with spacefilling might be taken to mean fractal dimensions measure density, but that is not so. The appeal of fractal analysis is that it can be applied to spatial features over.
The image illustrates a scan using a 50 pixel maximum box size with the area to skip set at 10 pixels and at 50 pixels. Awmpfd stands for areaweighted mean patch fractal dimension. Number of patches and classes nump number of patches count of number of patches in the. Spatial data analysis the accurate description of data related to a process operating in space, the exploration of patterns and relationships in such data, and the search for explanation of such patterns and relationships. Most useful and relevant metrics for landscape including. The word complexity is part of our everyday lives, of course, but fractal analysts have kidnapped it for their own. A strange attractor is a fractal, and its fractal dimension is less than the dimensions of its phase space.
Areal photography has become beneficial because it allows large areas to be covered and lets people view the marks left in the ground from ancient sites, many of. However, little is known and documented about the historical urban land dynamics in pingtan. Scale variation was addressed by using two levels of patch resolution cover type and. The land use dynamics, both for pattern and quantities were also studied using a post classification change detection technique together with the following selected spatiallandscape metrics. And the value of area weighted mean patch fractal dimension awmpfd of buildings was a maximum 1. Ppt spatial pattern analysis powerpoint presentation free to download id. Download citation computing local fractal dimension using geographical weighting scheme the fractal dimension d of a surface can be viewed as a summary or average statistic for. If sufficient data are available, the slope of the line obtained by regressing logp on loga is equal to 2d burrough 1986. By integrating remote sensing, geographic information systems and statistical analysis, this study aims to quantify and map the spatiotemporal urban.
The spatiotemporal land usecover change of adana city. By integrating remote sensing, geographic information systems and statistical analysis, this study aims to quantify and map the. Areal photography has become beneficial because it allows large areas to be covered and lets people view the marks left in the ground from ancient sites, many of which could not be viewed from ground level. A fractal dimension is an index for characterizing fractal patterns or sets by quantifying their complexity as a ratio of the change in detail to the change in scale 1 several types of fractal dimension can be measured theoretically and empirically.
The word complexity is part of our everyday lives, of course, but fractal analysts have kidnapped it for their own purposes in fractal analysis. Areabyarea allocation how is areabyarea allocation abbreviated. Study on landscape pattern based on landsat8 in the. Conversely, metrics based on the areaweighted mean patch characteristic. Core area coefficient of variation with edge of 200 meters. Because larger patches tend to be more complex than smaller patches, this has the effect of. Jul 25, 2012 the most important predictors of adult abundance were the mean value of daily wind speed in 7 previous days at sampling level and area weighted mean patch fractal dimension, forest edge density, euclidean mean nearestneighbour distance and proportion of broadleaved forest at site level. In order to choose the index with intercomplementary ecological meaning, we choose two landscape indices from two perspectives, areaweighted mean patch fractal dimension awmpfd from patch attributes and core area percentage of landscape cpl from spatial heterogeneity, to analyze the spatial fragmentation pattern of forest in the study area. Ppt teaching with technology powerpoint presentation free to view id. Spatial analysis what is here, and where are all the xs. You could consider the area to be a measure of the amount of space the fractal encloses. Fractal analysis usually is applied to the entire landscape mosaic using the perimeterarea relationship a k p 2 d, where k is a constant burrough 1986.
Shape complexity, equals 1 for shapes with simple perimeters and approaches 2 when shapes are more complex. Mpfd areaweighted mean patch fractal dimension awmpfd core area metrics the area within a patch beyond a buffer or. Remote sensing and gisbased analysis of urban dynamics and. Semisupervised classification and landscape metrics for. Several common complexityindices shape index, fractal dimension. Awmpfd stands for area weighted mean patch fractal dimension. Remote sensing and gisbased analysis of urban dynamics.
Chapter evaluating the ecological and environmental impact. Area weighted mean patch fractal dimension for the entire landscape. Core area coefficient of variation with edge of 140 meters. Areaweighted mean patch fractal dimension awmpfd was used as a measure of landscape fragmentation. How is area weighted mean patch fractal dimension abbreviated. Landscape metrics selected for analysis shannons diversity index mean shape index number of patches simpsons diversity index landscape shape index mean patch size modified simpsons diversity index areaweighted mean shape index total edge patch richness double log fractal dimension total area shannons evenness index areaweighted. This is to certify that the thesis prepared by jennifer l.
Using landscape metrics to create an index of forest. Note that this distribution is not the bpd used for lacunarity. Core area coefficient of variation with edge of 100 meters. Area weighted mean patch fractal dimension is the same as mean patch fractal. Multitemporal analysis of forest fragmentation in the. Metric definitions patch analyst help menu welcome to. An important defining property of a fractal is selfsimilarity, which refers to an infinite nesting of structure on all scales. The adobe flash plugin is needed to view this content. Oct 28, 2018 understanding the urban land dynamics and its causes is critical to manage and predict both urban development and its associated environmental qualities. On the other hand, you could think of trying to measure the size of the fractal itself. Whatever type of fractal analysis is being done, it always rests on some type of fractal dimension.
Fractal dimension index frac another normalized shape index based on. None 1 area weighted mean patch fractal dimension shape complexity adjusted for shape size. Total number of patches in the landscape if analyze by landscape is selected. Areabyarea allocation how is areabyarea allocation. Area weighted mean shape index, and perimeter area fractal. Area weighted mean patch fractal dimension is the same as mean patch fractal dimension with the addition of individual patch area weighting applied to each patch. A multilevel analysis of the relationship between environmental factors and questing. The value of the area weighted mean patch fractal dimension. Remove this presentation flag as inappropriate i dont like this i like this remember as a favorite. Thus, like the shape index shape, it overcomes one of the major limitations of the straight perimeter area ratio as a measure of shape complexity. Computing local fractal dimension using geographical. As mentioned in the comments there actually two orthogonal ways of thinking about the area of a fractal.
Because neighborhood rules determine what constitutes a single cluster or patch, they affect measured characteristics of the landscape pattern. Urban sprawl has also been measured using shannon entropy approach to describe the dispersion of land development or sprawl. In summary, 9 suites spatial aggregation levels of landscapes were generated. Sensitivity of landscape pattern metrics to map spatial extent asprs. Use this setting to avoid sampling edges when that will adversely affect your results. There are many types of fractal dimension or d f, but all can be condensed into one category they are meters of complexity. The application of landscape patch shape complexity as a predictor ofvascularplant and bryophyte species richness is analysed. Dec 29, 2006 area weighted mean patch fractal dimension awmpfd was used as a measure of landscape fragmentation.
A free powerpoint ppt presentation displayed as a flash slide show on id. Instead, a fractal dimension measures complexity, a concept related to certain key features of fractals. Areaweighted mean patch fractal dimension listed as awmpfd. The value of the areaweighted mean patch fractal dimension. It incorporates perimetertoarea ratios for patches across the landscape with higher weighting to larger patches. In this paper, we discuss two approaches to multiscale analysis of landscape heterogeneity. Jun 25, 2014 changes in area weighted mean shape index and area weighted patch fractal dimension index indicated that the physical shapes within builtup, forest and bareland areas were relatively complex and. Urban sprawl analysis gieri strengthening geoinformatics. Strict self similarity refers to a characteristic of a form exhibited when a substructure. Results from the analysis of spatial metrics of built up area in the study area has made it possible to quantify the trends and patterns of urban subtleties at the city level using the selected five metrics. Ppt spatial pattern analysis powerpoint presentation free.
The spatiotemporal land usecover change of adana city nasaads. Areaweighted mean patch fractal dimension how is areaweighted mean patch fractal dimension abbreviated. Because larger patches tend to be more complex than smaller patches, this has the effect of determining patch. It incorporates perimeterto area ratios for patches across the landscape with higher weighting to larger patches. Study on landscape pattern based on landsat8 in the center. Ppt teaching with technology powerpoint presentation. Awmpfd is defined as area weighted mean patch fractal dimension rarely. Using landscape metrics to create an index of forest fragmentation for the state of maryland by jennifer l. For example, as shown in the top figure, there is a strong thresholdlike relationship between the area weighted mean cluster size and p, the proportion of the landscape comprised of the focal class. Area weighted mean patch fractal dimension shape complexity adjusted for shape size. A raised to d, and d 1 a line as polygons move to complexity p a, and d 2 a few fractal metrics double log fractal dimension dlfd mean patch fractal mpfd areaweighted mean patch fractal dimension awmpfd core area metrics the area within a patch beyond a buffer or edge distance corresponding metrics with those dealing with. You may need to explore how the maximum box size and the margin interact for different. Chapter evaluating the ecological and environmental. Awmpfd areaweighted mean patch fractal dimension awmpfd 20ln.
Pfister, entitled using landscape metrics to create an index of forest fragmentation for the state of maryland, has been approved by this committee as satisfactory completion of the requirement for the degree of master of arts in geography in the department of geography and. As an example, if you are interested in the distribution of the fractal dimension over an image in the range of 1. Download scientific diagram area weighted mean patch fractal dimension. Landscape and fragmentation analysis patch analyst patch. The diversity indices include metrics such as richness, evenness, dominance and diversity, referring to the number of patch types, the relative abundance of differentpatchtypes,andacompositeofbothmcgarigaletal. Changes in areaweighted mean shape index and areaweighted patch fractal dimension index indicated that the physical shapes within builtup.
Landscape and fragmentation analysis patch analyst. For example, as shown in the top figure, there is a strong thresholdlike relationship between the areaweighted mean cluster size and p, the proportion of the landscape comprised of the focal class. Ppt spatial pattern analysis powerpoint presentation. And the value of areaweighted mean patch fractal dimension awmpfd of buildings was a maximum 1. How is areaweighted mean patch fractal dimension abbreviated. Teaching with technology powerpoint presentation free to view id. Core area coefficient of variation with edge of 20 meters.