Esri staff show how to identify space-time hotspots, detect spatial-temporal outliers, and group features using space-time constraints.
Jul 24th, 2012
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Martin (email@example.com) flag
Hello there. I really enjoyed watching this space-time analysis. I have some queestion about how you actually generate the count of incidents which are time aware as well. can you elaborate more about this part?Many Thanks`
You can find documentation about visualizing the output in 3D here: http://resources.arcgis.com/en/help/main/10.2/index.html# //005p00000056000000. There is a space before the double slashes (//) to ensure the whole link shows up. Just delete that when you copy and paste the link. Hope this helps!
You mention documentation for the 3d? Is that available?
Thank you for providing the additional details. I have forwarded them to Lauren Scott. For further assistance, please e-mail Lauren directly at firstname.lastname@example.org. She will be able to assist you further.
Thanks for the quick response, but i still have some things unresolved would appreciate if you can help me resolve these things.
1) Point data that has a time field cannot be integrated with a tolerance before using [collect_events] tool, as each date is required to carry out space-time analysis if I'm not wrong
2) By using the [incremental_autocorrelation] the optimal distance threshold can be identified as the input for the [Getis-Ord Gi*] hotspot tool. Likewise isn't there a tool to find out the best time interval the most pronounce temporal clustering is happening to be provided as a input for creating a "spatial weights matix" for time window option.
3) After I created the spatial weights matrix I tried to collect the events to create [ICOUNT] field thinking it will carry the associated [ICOUNT] values associated to the spatial weights matrix. Then as u suggested I populated the FID field and carried out the hotspot analysis. But the in the processing messages it indicated that the id did not match with the "id" field that was provided as input for hotspot.
4) as a solution what I did was created a table using the swm file then added x coordinate as a field also added a x coordinate field in the collected events feature set and joined both the feature dataset with the table thinking the x coordinates should match with each others. When I did this I was able to go ahead with the time-space analysis
5) Is that method ok according to your best practices?
Sorry for asking so many questions. It would be great if you can clarify these doubtful areas to me soon.
On behalf of Lauren Scott, one of the presenters, here's what you need to do:
To create a unique ID field:
1) Use Add Field … type LONG… call the field something like UniqID
2) Use Calculate Field to populate the new field with the FID or OBJECTID
If you can explain a bit more about what you are trying to do, Lauren is happy to help. Please feel free to e-mail her directly at email@example.com.
Thank you for your question. It has been shared with the presenters.
Please can any one tell how to associate a unique ID when collecting the events. In this video Lauren has a unique ID field in her collected weighted events. But when i create the spatial index file and then collect the data i get a error saying the id of the spatial weights matrix do not match with the input file. Would appreciate much if someone can help me