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Sorry, I was under the impression that .7z files were okay to upload...:o Here are my shapefiles in .zip format: [ATTACH]1881[/ATTACH] Thanks for your willingness to help Michael...
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07-26-2010
10:34 PM
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Hello again Michael, despite your continued assistance I have not been able to conduct my desired analysis. I have tried to make it work until I figuratively got 'blue-in-the-face', but to no avail. Primarily I am struggling to create a new network dataset that is suited to my input data and analysis criteria. I'm wondering if it is at all possible for you, based on the characteristics of my input data and desired type of analysis, to guide me step-by-step through the "New Network Dataset" creation wizard to achieve my desired results? I normally would not request something of this nature, but I am fresh out of university and a novice with network analyst and I am having trouble in specifying the right criteria in the "New Network Dataset" creation wizard to achieve the desired analysis due to my inexperience (I'm having trouble with determining the correct cost attributes for my network dataset/analysis in particular!). I feel kind of silly to request this but I've virtually exhausted all other alternatives (including the network analyst tutorial) and my boss is sort-of on my back to get this done ASAP... Here are my input shapefiles if you are interested in assisting me with this matter: [ATTACH]1868[/ATTACH] With this input data I would like to generate consecutive travel time polygons (in minutes) originating from the amenities (points) along the road network with the "Calculate Service Area" tool... It is therefore a very basic analysis with no restrictions for modeling real-world travel constraints (turns, driving directions, frictional surfaces, etc.). I keep saying to myself this can't be that difficult but I have had little progress and even less success... I will be very greatful if you were to put in some effort in my aid...
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07-26-2010
06:16 AM
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Thank you for your assistance Michael, I was not aware that the extension had to be enabled in ArcCatalog as well... 😮 However, I am still encountering difficulties with creating a network dataset that allows me to calculate pedestrian travel times from certain points along (but unconnected to) a road network... In other words: I would like to generate consecutive travel time polygons (in minutes) originating from the amenities (points) along the road network/ Here is a edited screen shot of the polyline.shp and point.shp I intend to use for the abovementioned purpose: [ATTACH]1774[/ATTACH] Furthermore, I am unsure if the input roads shapefile must contain certain fields in its attribute table (it currently contains line segment lengths only) and if it must have a certain state of connectivity prior to creating a network dataset for the intended analysis to work. Will it be necessary to add any other fields to the attribute table or edit the current state of connectivity of the line segments? Also, could anybody provide me with guidelines of what to do in the "new network dataset" wizard to prepare my network dataset to perform my desired analysis? Any input and suggestions will be much appreciated!
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07-19-2010
04:41 AM
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Hi there, I'm quite new to the network analyst toolset and would like to perform a basic service area analysis but I am having bit of trouble with creating a network dataset in ArcCatalogue... I have ensured that the network analyst extension has been activated in Main menu\Tools\Extensions but when I right click on my source polyline shapefile (roads) in ArcCatalogue the "New Network Dataset" option is unselectable. I have searched for a solution in the ArcGIS Desktop help function, the Network Analyst Tutorial .pdf document and various forums and I have reached the conclusion that that my input shapefile does not have the required fields in its attribute table and/or has polyline connectivity errors that prevent it from being used as source data for the creation of a network dataset. So how do I make it work? I basically just want to calculate pedestrian travel times from certain points along (but unconnected to) a road network... Any input and suggestions will be greatly appreciated!
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07-15-2010
03:24 AM
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