Timeline for Comparing areas of polygon over time
Current License: CC BY-SA 3.0
10 events
| when toggle format | what | by | license | comment | |
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| Jun 15, 2016 at 18:16 | answer | added | crld | timeline score: 1 | |
| Jun 15, 2016 at 16:15 | history | edited | user20408 | CC BY-SA 3.0 |
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| Jun 15, 2016 at 5:15 | answer | added | FelixIP | timeline score: 0 | |
| Jun 15, 2016 at 5:02 | comment | added | user20408 | @MichaelMiles-Stimson thanks for your response. I have an advanced license. How would Union work to get the results I need? I've used the tool occasionally before but not for anything like this. Thank you. | |
| Jun 15, 2016 at 5:00 | comment | added | user20408 | @FelixIP I do have an advanced license. For combine, the problem is that overlapping polygons do not have the same ID. That is why I was planning on using a spatial join, to relate the polygons over time to each other It appears that combine works by combining like values, although I could be wrong. Thoughts? | |
| Jun 15, 2016 at 0:45 | comment | added | Michael Stimson | Without an advanced license you can union two layers only, if you use the workflow A union B = AB, AB union C = ABC, two steps to overlay 3 feature classes. This gets tedious if you've got hundreds but 3 isn't too bad. Beware the shapefile database size limit (2GB), you might want to do this in a file geodatabase if the joined tables are going to be large. | |
| Jun 15, 2016 at 0:35 | comment | added | FelixIP | I'd stick to rasters and use Combine. It will tell you complete story, e.g. new lake, dried up, exists in all 3 etc. Alternative is union of polygons with advanced license | |
| Jun 14, 2016 at 21:08 | history | edited | PolyGeo♦ | CC BY-SA 3.0 |
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| Jun 14, 2016 at 20:35 | history | edited | user20408 |
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| Jun 14, 2016 at 20:22 | history | asked | user20408 | CC BY-SA 3.0 |