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Showing content with the highest reputation on 09/25/2014 in all areas

  1. The centrograpic tools and global statistic tools (mean, standard distance, directional distribution, NNI and Getis-Ord General(Gearys C)) will tell you if there is patterns and clusters in your data and how significant they are but NOTHING about where and why. You might need to manipulate/change/add your data before you can perform a Getis-Ord Gi* test (also one with automatic rendering). This tool will tell you WHERE your coldspots are and your hotspots are and the area that is 'not significant' and it will do it at a 90-95-99% confidence level and give you values about observed distance and expected distance and other values that is statistical proven. KDE and Hotspot analysis is two different things and therefore NOT comparable although MANY police forces uses the KDE. The KDE will hide your coldspots.....depending on your threshold it will increase/decrease your density.....if use over different polygons/areas it will give you different outputs that are not in the same scale but only relevant to the dataset.....Getis-Ord Gi* does NOT do this. Intended or unintended you could lead he user/reader into misinterpretation with a KDE......this would be almost impossible with the Gi* A good reference is the 'Understanding hotspot' by Chainey et al and published by NIJ in 2005 (National Institute of Justice)
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  2. Urban Network Analysis: A Toolbox for ArcGIS 10 / 10.1 The City Form Lab has released a state-of-the-art toolbox for urban network analysis. As the first of its kind, this ArcGIS toolbox can be used to compute five types of graph analysis measures on spatial networks: Reach; Gravity; Betweenness; Closeness; and Straightness. http://vimeo.com/44728530 The tools incorporate three important features that make them particularly suited for spatial analysis on urban street networks. First, they can account for both geometry and topology in the input networks, using either metric distance (e.g. Meters) or topological distance (e.g. Turns) as impedance factors in the analysis. Second, unlike previous software tools that operate with two network elements (nodes and edges), the UNA tools include a third network element - buildings - which are used as the spatial units of analysis for all measures. Two neighboring buildings on the same street segments can therefore obtain different accessibility results. And third, the UNA tools optionally allow buildings to be weighted according to their particular characteristics - more voluminous, more populated, or otherwise more important buildings can be specified to have a proportionately stronger effect on the analysis outcomes, yielding more accurate and reliable results to any of the specified measures. The tools are aimed at urban designers, architects, planners, geographers, and spatial analysts who are interested in studying the spatial configurations of cities, and their related social, economic, and environmental processes. The toolbox is built for easy scaling - it is equally suited for small-scale, detailed network analysis of dense urban areas as it is for sparser large-scale regional networks. The toolbox requires ArcGIS 10 software with an ArcGIS Network Analyst Extension. Download: http://cityform.mit.edu/files/Urban%20Network%20Analysis%20Tool.zip Help: http://cityform.mit....es/UNA_help.pdf Credits: Andres Sevtsuk, Michael Mekonnen. Please send your comments, questions, and feedback to [email protected]
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  3. Hi mate, Look at this link: https://bitbucket.org/cityformlab/urban-network-analysis-toolbox/downloads/Urban%20Network%20Analysis%20Toolbox%201.01.zip darksabersan.
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  4. The purpose of VBA and Python in fact popular to make easy repeated/iteration-able work inside ArcGIS desktop product. Mostly you need to open core product than you can use your developed tool/button etc. However you also can make GUI using third party/or your developed modules if you are strong on that. But you need to have desktop license installed in your computer. ArcObject offer mainly to make standalone solution through Dot Net framework. To deploy your development you will need runtime license.
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