Open Hornbydd opened 5 years ago
@dsear,
I have been fixing some of the bugs in the island bank tool (not the river bank tool). Got most of them but there are a couple of topologically knotty issues, those pathological cases that exist. These are the law of diminishing return type problems and for the demonstration dataset I think acceptable. It will take some brain effort to solve those! I assume I just need to cookie cut those data to the floodplain partitions so they can be attributed back to the segment, if that is what you want?
I have constructed a tool that takes the partition floodplain, segmented network and the change in area for banks and islands and transfer this data to the segmented network layer.
This transfer 4 fields of data to the segmented network.
Field name | Field Type | Description |
---|---|---|
Bank_Deposition_Outside2mError | Double | This is the area of deposition within the segments floodplain partition polygon that was coded as outside the 2m error and thus considered real change. |
Bank_Erosion_Outside2mError | Double | This is the area of erosion within the segments floodplain partition polygon that was coded as outside the 2m error and thus considered real change. |
Bank_Deposition_Within2mError | Double | This is the area of deposition within the segments floodplain partition polygon that was coded as inside the 2m error and thus considered error rather than real change. |
Bank_Erosion_Within2mError | Double | This is the area of erosion within the segments floodplain partition polygon that was coded as inside the 2m error and thus considered error rather than real change. |
@dsear and @joewheaton ,
We have bank lines for 2009 and 2015, the area between them could represent erosion or deposition an example is shown below.
The challenge is to:
Step 1
Intersection split points
Step 2
Step 3
Step 4
Lines enclosed and attributed with a label layer
Step 5
Red indicates the polygon area is less than the proposed 2m buffer area and is therefore considered a possible digitising error rather than any real change.
Limitations with this tool