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Hi Will, I used the WGS 1984 in each. The data source was an excel table of latitude and longitude data for individual addressed. Unfortunately I cannot provide a copy of the data due to the nature of the events. I did select geodesic where there was an option to select that. Is there a way to know which is the most accurate method? Thanks, Madi
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09-10-2018
08:21 AM
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Hi Will, Have outlined the methods below. Selection method: Menu Selection Select by location Picked source layer and target layer Are within a distance of the source layer feature (distance 100m, 200m, 300m etc.) Near tool method: Toolbar Near tool Location Source layer and target layer Within x metres (100m, 200m, 300m) Geodesic distances Thanks, Madi
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09-10-2018
02:32 AM
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Hi Will, I am using ArcGIS Maps for Office The results have been calculated for events occurring within a certain distance of a school i.e.. 100m, 200m, 300m etc. up to 1000m. For example: Using the near tool I get 100m - 425 events 200m - 2093 events 300m - 4250 events Using the selection method 100m - 234 events 200m - 1284 events 300m - 2797 events Looking at the data the discrepancy in the results cannot be explained by one event being counted as being within a certain radius of more than two schools.
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09-06-2018
02:12 PM
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Hi, I am using Arc GIS to map the location of events and the locations of schools in a region. I have then used the programme to find the number of events occurring within 300meters of a school. I have utilised the near tool for this as well as the select by distance from location method. These two tools are giving me different answers as to the number of events occurring within 300meters of a school. Does anyone know why that would be? Thanks, Madi
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08-23-2018
11:20 AM
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