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Join location from another layer pivot table

  1. 1. O IN L J IA AT SP Spatial Join Calculating Number of Physician per Population 2 GIS in Health and Planning 2 01 1/ 2012 Spring 3/ Rutgers University by Wansoo Im, Ph.D.
  2. 2. Download census tract 2000 file -www.state.nj.us/dep/gis Download Municipal boundaries -https://njgin.state.nj.us “doctor point location layer” (downlaod from Sakai ) Census tract map/Municipality boundaries =>Add All Maps in Arc GIS
  3. 3. CENSUS TRACT : OPEN ATTRIBUTE TABLE In order to see what kind of information it has
  4. 4. DOCTOR LOCATION LAYER : OPEN ATTRIBUTE TABLE In order to see what kind of information it has
  5. 5. HOW TO JOIN LOCATIONAL DATA WITH DATA FROM ANOTHER LAYER? Based on the location, we will join doctor’s location into Census tract layer.
  6. 6. JOIN DOCTOR POINTS WITH CENSUS DATA LAYER
  7. 7. CLICK “DATA FROM ANOTHER LAYER BASED ON SPATIAL LOCATION”
  8. 8. SELECT “THE LAYER(CENSUS TRACT)” WHICH YOU WANT TO JOIN WITH DOCTOR LOCATION
  9. 9. SET THE DIRECTORY(LOCATION TO SAVE YOUR SHAPEFILE) -> CLICK “SHAPEFILE”
  10. 10. OPEN ATTRIBUTE TABLE TO CHECK IF NEW LAYER(DOCTOR CTR) IS SUCCESSFULLY JOINT By opening attribute table, you can check if data from 2 original layers(doctor points/census tract information) are included into a newly-created shapefiles.
  11. 11. LOOK THROUGH DATA
  12. 12. EXCEL – PIVOT TABLE Objectives : We are going to export data from maps into dbf. (dbf. File includes the information of table, therefore, all shapefiles including data in the table have dbf. file) Open dbf. File in Excel By using Pivot table, we will calculate the number of doctors by each census tract (the number of doctors belonging to each census tract)
  13. 13. OPEN ATTRIBUTE TABLE OF DOC_CTR LAYER Click the menu icon to export data from table.
  14. 14. EXPORT DATA “DBF. FORMAT FILE”
  15. 15. WHY WE EXPORT DATA FROM TABLE? (DBF. FORMAT) Originally Doc_CTR shapefile already has one dbf.file, however, if we start to open it in the excel and modify, we can possibly affect the original map data as the table is directly linked to a map. Therefore, we would like to export data from the original table so as to create new dbf. File(so to speak, “copy” dbf. file). In this way, we can adjust data(by using a new dbf. File) in Excel regardless of affecting original data in the map.
  16. 16. OPEN -> CLICK “ALL FILES”-> CLICK “DBF FILE”
  17. 17. OPEN IN EXCEL
  18. 18. WE CAN USE EXCEL FOR DATA CALCULATION!
  19. 19. THE NUMBER OF DOCTORS WITHIN EACH OF CENSUS TRACT. Number of doctors in each of census tract. How do we calculate?
  20. 20. USE UNIQUE ID TO JOIN “INDIVIDUAL DOCTOR LOCATION” WITHIN CENSUS TRACT – “KEY” FIELD OR “STFID” (CENSUS TRACT ID) Why can’t we use Tract field? – Tract id is within County (Aggregate scale)
  21. 21. CLICK “INSERT” -> PIVOT TABLE
  22. 22. CLICK “PIVOT TABLE”
  23. 23. CLICK OK
  24. 24. THEN YOU WILL SEE THIS TABLE ;
  25. 25. DRAG “STFID” INTO ROW LABELS
  26. 26. DRAG “STFID” INTO VALUES
  27. 27. COPY THE TABLE
  28. 28. PASTE “VALUE” INTO NEW “SHEET” Counting Case depending on variable that you chose. In this case, Fivot Table counts the number of doctors depending on the Census Tract Area(Assigned by unique ID).
  29. 29. CLEAN THE DATA – FIRST ROW SHOULD INDICATE THE NAME OF FIELD
  30. 30. CLEAN THE DATA – DELETE LAST ROW ; TOTAL NUMBER
  31. 31. CHANGE “SHEET” NAME INTO DATA Name that you can remember No space/No special characters (Arc GIS cannot recognize)
  32. 32. SAVE EXCEL FILE AND CLOSE IT BEFORE JOINING IN ARC GIS PROGRAM
  33. 33. CENSUS TRACT LAYER- OPEN ATTRIBUTE BEFORE JOINING DATA
  34. 34. JOIN THE TABLE
  35. 35. JOIN ATTRIBUTE FROM A TABLE
  36. 36. SELECT THE FIELD TO JOIN “STFID” (UNIQUE CENSUS TRACT ID)
  37. 37. CLICK EXCEL FILE YOU SAVED
  38. 38. CLICK THE “SHEET” THAT YOU SAVED NEW DATA (NO.DOCTORS BY CENSUS TRACT)
  39. 39. SELECT THE FIELD(STFID) FROM “DATA SHEET”
  40. 40. CHECK ATTRIBUTE TABLE TO MAKE SURE IF TABLE IS JOINT WELL There are some null data because this census tract is statewide while doctor location is located only within Middlesex county.
  41. 41. CALCULATE THE NUMBER OF DOCTORS PER POPULATION WITHIN CENSUS TRACT The number of doctor The number of population Let’s calculate doctors per population.
  42. 42. ADD A NEW FIELD
  43. 43. FIELD CALCULATION
  44. 44. ADD FIELD 10 digit/3decimal
  45. 45. CREATE NEW FIELD (FOR DOCTORS/POPULATION) ->RIGHT CLICK TO DO “FIELD CALCULATING”
  46. 46. FIELD CALCULATOR But you will have 0 if denominator(total population2000=0) is 0 Select the data which population 2000 is more than 0 Use Field Calculator to use formula (number of doctors/population*100)
  47. 47. 2 WAYS FOR SELECTION 1. Select by Attribute select the layer “census 2000”, and select the field “population2000” put formula Pop2000>0 ->click apply 2. Sorting Ascending in Attribute Table Open Attribute table, sort the data regarding population 2000, and select data which is more than 0 in population 2000 field.
  48. 48. EX1) SELECTION BY SORTING POPULATION
  49. 49. EX2) SELECTION BY MENU (SELECTING BY ATTRIBUTE) Make sure if Population(denominator) is 0 not
  50. 50. FIELD CALCULATOR
  51. 51. RATE CALCULATION – WHY 1000? INSTEAD 100?
  52. 52. IF THERE’S NULL DATA => ERROR!!! Population should be over 0 AND Number of doctors shouldn’t be null data Therefore, number of doctor is more than 0 and calculate it again (Assume that if there’s doctor, population is over 0)
  53. 53. YOU WILL GET NO.DOCTORS PER POPULATION PERCENTAGE IN NEW FIELD YOU CREATED.
  54. 54. OUTCOME
  55. 55. UNSELECT DATA
  56. 56. GO TO SYMBOLOGY AND MAP IT OUT! The number of doctors per population
  57. 57. EXPORT MIDDLESEX MUNICIPALITY FROM CENSUS TRACT
  58. 58. SELECT MUNICIPAL OF MIDDLESEX COUNTY
  59. 59. EXPORT MIDDLESEX COUNTY CENSUS TRACT Field : Double click “County” Click “Unique value County= Middlesex county
  60. 60. CHANGE DECIMAL DEGEE IN LEGEND -> CLICK “LABEL” AND “FORMAT LABEL” CHANGE DECIMAL DEGREE.
  61. 61. EXPORT MUNICIPAL BOUNDARY SHAPEFILE. County = Middle sex
  62. 62. EXPORT MIDDLESEX COUNTY BOUNDARY SHAPEFILE.

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