Using Joins During Conversions

By: Brett Heist and Alex Finch

***Note: Be mindful of the order of join instructions. X to Y produces a different result than Y to X.Steps:1. Add the current Leasehold and new parcels to map2. Delete the Possible HBP entries from leaseholda. Selection > Select by Attributes > Enter "LEASE_STAT" = 'POSSIBLE HBP' > Delete Selected in Table3. Run a dissolve on the parcel layer using the PAR_NUM field naming the output ParcelDissolve and add the this to the data framea. Right Click Layer > Data in the drop down > Export Datab. ArcToolbox > Data Management > Generalization > Dissolve4. In order to know later in the process how many iterations of a few steps we will need to do, we will run a quick summarize table. Create a new field in the leasehold table and call it SUM. Right click the PAR_NUM field in the leasehold and select summarize. Select the SUM table in the popup and check the box variance. Run the summary table saved as a dBASE and minimize it until step 19. The highest number is the highest number of duplicates.5. To ensure we keep unique values unique we will now generate our own field giving each entry a unique number. Create a new field (name it UniqueID) and enter this code into the pre-code block of the field calculator in python:rec=0 def autoIncrement(): global rec pStart = 1 pInterval = 1 if (rec == 0): rec = pStart else: rec += pInterval return rec

In the second box enter autoIncrement() without the quotes and hit okay.

6. 7. Export the leasehold attribute table out to a dBase table titled LeaseholdTablea. Right Click Layer > Data in the drop down > Export Datab. Ensure the file is being saved as dBASE type8. Join the dissolved parcel layer to the newly created dbase table using the PAR_NUM* field.a. Right Click Layer > Joins and Relates in the dropdown > Join

9. Run the Select by Attributes query pictured below and export the output to a new shapefile (Not table!) and call it Converted adding the output to the data frame.a. Right Click Layer > Export > Export Selectedb. There will be two PAR_NUM fields generated, one from the Parcels and one from the Leasehold. Use PAR_NUM field with the asterix *. This will indicate the joined field.

10. Remove join from the parcel layera. Right Click Layer > Joins and Relates in drop down > Remove Joins11. Join the Leasehold table to the newly created Converted shapefile to the using the Unique ID field.

12. Open table and scroll over to the joined Unique ID field for the shapefile and sort descending, select all records with non-null value for the PAR_NUM field and delete those.a. Because joins cannot have a one-to-many relationship, the duplicate entries in the PAR_NUM field on parcels with multiple leases will not join. Only the first entry with a duplicate will successfully join. With this and the next few steps we will do multiple joins, deleting the successful matches successively until no duplicates remain and we have multiple tables with all unique values. Be sure to check that the number of entries you are deleting is matching to the number of entries in the newly created Converted shapefile. 13. Remove join and save edits, then stop editing the table14. Join the dissolved parcel layer to the leasehold table using the PAR_NUM field, scroll over and sort the PAR_NUM* field descending and select all records with a value for the PAR_NUM* field.

15. Export those out to a new shapefile and call it Converted216. Remove join from the dissolved parcel layer17. Join the leasehold dBase table to the Converted2 shapefile using the OBJECTID field

18. Scroll to the PAR_NUM field and sort descending, select all records with a value in that field and delete.19. Save edits, stop editing and remove join.20. Repeat these steps for the highest count found in the summarize step (step 4), resulting in shapefiles Converted1 through Convertedx.21. Remaining rows will be leases that contain parcel numbers not found in the parcel layer, and therefore must be manually checked. Export these to a new table to work with.22. Copy and paste the results from numbered shapefiles (ex. Converted2) into the original to create a master table.23. In the master table create a check ratio for mapped acres/calculated acres.24. Finally, create a possible HBP layer.