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Join Trick

Join Trick. It works!. Parcel with 4 cover types. Any > 100%. What did I do?. Imported the tax data and the cover data into a new GDB In that process I deleted the shape_area fields So ArcGIS recreated them – but they were not different from the original shape-areas. And.

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Join Trick

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  1. Join Trick It works!

  2. Parcel with 4 cover types

  3. Any > 100%

  4. What did I do? • Imported the tax data and the cover data into a new GDB • In that process I deleted the shape_area fields • So ArcGIS recreated them – but they were not different from the original shape-areas

  5. And.. • I carefully turned off all fields I did not need so I wouldn’t get confused • Did the Join • Created the % field • Calculated the percentages / parcel • ????????????????????

  6. Then I Went back… • To the original data • The shape_area fields were incorrect • Moral of the story …. Be careful when importing data into a GDB!

  7. Now that we know that works… • We wanted parcels that were between 40 and 60 Ag cover • Select by attribute • [pct]=>40 and [pct]<=60 • Since did Intersect and joined TaxParcels this selected the stuff in the Intersect laye • So, to get parcels join the intersect layer to the Tax Parcel area  selected parcels

  8. Bummer… • Even when I joined the intersect layer to the tax parcel layer I got values >100% • I did check the area calculations for Tax Parcels by using a script to calculate area • Perfect match • Problem is in the intersection 

  9. Leave that problem hang • And look at some other types of things that can be done in GRIDS

  10. Viewshed • Used for placement of… • Cell Towers • TV station towers (vhf is line-of-site) • Microwave relay towers • Views from viewpoints

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