Spatial Join - Poly->Poly - Overlapping

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07-24-2019 02:21 PM
ScottFraser3
New Contributor III

The attached screenshot, shows two flood zones (AE-6 & AE-7).  The numeral in the flood zone identifier represents the flood elevation level.  Also shown are the building footprints.

Using spatial join with the match Option set to "Completely within" easily associated all these buildings with the proper flood elevation,

However, when buildings straddle the flood zone boundary line (see selected footprints in the attached graphic), I haven't figured-out how to get the spatial join to identify the proper flood elevation; in this case "7" feet as opposed to "6" feet. (When a flood zone boundary line touches a building to any degree, the entire building is considered in the higher regulated zone.)

Any suggestions?

Thanks,

Scott

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Accepted Solutions
LanceCole
MVP Regular Contributor

Scott, 

Try the following, using the Spatial Join Tool in ArcMap or Pro:

1) SetTarget Features - Buildings

2) Set Join Features - FloodZones

3) Set your output Feature Class

4) Join Operation - JOIN_ONE_TO_ONE

5) In the Field Map section

ArcMap

Right click on the name of your Zone attribute in your FloodZone feature

Select - Merge Rule > Maximum

You can also remove any fields that you do not need from the Field Map using the "X" button.

Pro

Select the name of your Zone attribute in your FloodZone feature

Set the  Merge Rule to Maximum

You can also remove any fields that you do not need from the Field Map by right clicking.

Set the Match Option to Intersect

6) Run the Join

10.7 ArcMap

Spatial Join Dialog

2.4 Pro

Pro Spacial Join

The resultant joined feature class will have the Maximum value assigned from the FloodZone to the Building. 

Result

View solution in original post

2 Replies
LanceCole
MVP Regular Contributor

Scott, 

Try the following, using the Spatial Join Tool in ArcMap or Pro:

1) SetTarget Features - Buildings

2) Set Join Features - FloodZones

3) Set your output Feature Class

4) Join Operation - JOIN_ONE_TO_ONE

5) In the Field Map section

ArcMap

Right click on the name of your Zone attribute in your FloodZone feature

Select - Merge Rule > Maximum

You can also remove any fields that you do not need from the Field Map using the "X" button.

Pro

Select the name of your Zone attribute in your FloodZone feature

Set the  Merge Rule to Maximum

You can also remove any fields that you do not need from the Field Map by right clicking.

Set the Match Option to Intersect

6) Run the Join

10.7 ArcMap

Spatial Join Dialog

2.4 Pro

Pro Spacial Join

The resultant joined feature class will have the Maximum value assigned from the FloodZone to the Building. 

Result

View solution in original post

ScottFraser3
New Contributor III

Oh Sweet!

That worked first time like a charm.

For you to include an instructive graphic (I am using Pro) was above and beyond.

Thank you,

Scott

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