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Geoprocessing tasks on time-enabled vector data

Question asked by philip.white_ucboulder on Apr 24, 2019

Hello,

 

I'm working with someone on a historical GIS project. The project is analyzing changes in land ownership over time. One of the attributes has a field for "name", for example. And over time, the land holder may have sold off part of the land to another person. The time data has both start and end fields formatted as YYY-MM-DD.

 

Time was enabled on the layer to activate the slider.

 

According to this, "

There are three ways in which this type of analysis can be performed. First, all geoprocessing tools honor the time settings for time-enabled layers so only those features that fall temporally within the time extent set in the time slider will be processed. The results are then displayed as a single layer on a map."

Following that logic, one would think that if we adjusted the time slider to a certain date, we could run a geoprocessing tool that would essentially run a process on a "time-slice" of the data, right?

What we're trying to do is sum all of the land parcels owned by individuals during a certain time slice. For example, on day 1 (or whatever unit), Smith owned 4 discontiguous land parcels at x acres apiece. What's the total acreage? The next day, Smith sold a parcel and had 3 discontiguous land parcels. What was the total acreage on that day?

We attempted to use the dissolve tool to aggregate data based on owner name, and sum the area fields for all the features owned by that name. We chose to create multipart features so there would be--in theory--one multipart field per landowner.

We adjust the slider to a certain time step and run the dissolve tool, but it appears to run over the whole dataset, not just the time slice.

We're not sure what is going on here.

Thanks for any insight.

Phil

CU Boulder

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