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Counting XY data in ArcGIS Desktop

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#1
ken

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I've loaded some XY data into Arc Desktop and I also have a map of census tracts. Is there a way to count how many dots are in each tract? I know there must be... <_<

I've been poking around the program and online and nothing seems to click.

#2
peanut

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You want to do a spatial join:

1) Load both your point and polygon layer into ArcMap.

2) Right-click on your polygon layer (tracts) and select 'Joins and Relates>>Join'

3) In the dialog that comes up under 'What do you want to join to this layer?' Select 'Join data from another layer based on spatial location'

4) Choose your point dataset as the layer to join to this layer.

5) Select 'Sum' where it says 'How do you want the attributes to be summarized?'

Hope this helps.

Rich

#3
Matthew Hampton

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I think I would download Hawth's Tools and use the "points in poly" function.

Even if you don't use PnP, the entire toolset is free and has lots of handy tools. They are targeted toward ecological functions, but I have found many to be quite handy (and free ;) !)

co-cartographic creator of boringmaps.com


#4
Unit Seven

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I think I would download Hawth's Tools and use the "points in poly" function.

Even if you don't use PnP, the entire toolset is free and has lots of handy tools. They are targeted toward ecological functions, but I have found many to be quite handy (and free ;) !)


May of these are definatly useful. Great link Matthew—thanks!
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#5
ken

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Used Hawth's Tools, worked great. Will have to try the other method too. There's always so much to learn with arcview. Reminds me of when I was first using Photoshop ...

Thanks all.

#6
Matthew Hampton

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Reminds me of when I was first using Photoshop ...


I still feel that way sometimes using ESRI software.

The difference being, that over that 15 years or so Photoshop has maintained and streamlined it's interface using pretty much the same file formats leading to a somewhat intuitive workflow as one progresses from amateur to advanced user. Arc, on the other hand has completely redeveloped itself and it's file-format 3 times (coverage, shapefile, geodatabase) in the same time period leading users to constantly need training and retooling.

Sometimes I think it's a good thing, other times I'd like to do this --> :ph34r:

co-cartographic creator of boringmaps.com


#7
Hans van der Maarel

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Arc, on the other hand has completely redeveloped itself and it's file-format 3 times (coverage, shapefile, geodatabase)


And woe the person who has to work with any of the new proprietary formats (various flavors of geodatabase) without having Arc itself... FME supports them, but only if you have Arc installed on the same computer... :rolleyes: Fortunately Manifold can do it.
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