MapInfo Pro

1. Rotate the polygon so that the polygon is on its side (with its straight edge running east-west). I did this by trial and error but you could calculate the angle beforehand.  Use the Rotate Object that comes with the Map Cad tool.
   
   

   

WARNING: choose the anchor point carefully when rotating; you will use this same anchor point later when reversing the rotation.

2. Use Grid Maker to create very small grid regions that cover your polygon – the smaller the more accurate.
3. Delete grid regions that are outside your region.
   
4. Perform a group by to find the min and max row value of each column:

 Select Col_Name, Min(Row_Name) "MinRow", Max(Row_Name) "MaxRow" from Grid group by Col_Name into GridRowMinMax 

5. Perform a query that returns the middle row value: 

Select Col_Name, MinRow, MaxRow, Int((MaxRow-MinRow)/2)+MinRow "MidRow" from GridRowMinMax into GridRowMinMaxMid 

6. Save this query and open as a new table 

7. Join this query to the Grid table:

Select * from Grid, GridRowMinMaxMid where Grid.Col_Name=GridRowMinMaxMid.Col_Name And Val(Grid.Row_Name)=GridRowMinMaxMid.MidRow into MiddleGrids

8. Save the results and open as a new table
    

9. You might then convert these to points perhaps (for greater accuracy)

                 Update MiddleGrids Set obj = CreatePoint(CentroidX(obj),CentroidY(obj))

10. Then buffer the points to create your 5-foot-wide track:

11. Erase Outside to straighten the end points if desired:

12. Finally, return the object to the correct rotation (using the same anchor point as that used in step 1):

1. Rotate the polygon so that the polygon is on its side (with its straight edge running east-west). I did this by trial and error but you could calculate the angle beforehand.  Use the Rotate Object that comes with the Map Cad tool.
   
   

   

WARNING: choose the anchor point carefully when rotating; you will use this same anchor point later when reversing the rotation.

2. Use Grid Maker to create very small grid regions that cover your polygon – the smaller the more accurate.
3. Delete grid regions that are outside your region.
   
4. Perform a group by to find the min and max row value of each column:

 Select Col_Name, Min(Row_Name) "MinRow", Max(Row_Name) "MaxRow" from Grid group by Col_Name into GridRowMinMax 

5. Perform a query that returns the middle row value: 

Select Col_Name, MinRow, MaxRow, Int((MaxRow-MinRow)/2)+MinRow "MidRow" from GridRowMinMax into GridRowMinMaxMid 

6. Save this query and open as a new table 

7. Join this query to the Grid table:

Select * from Grid, GridRowMinMaxMid where Grid.Col_Name=GridRowMinMaxMid.Col_Name And Val(Grid.Row_Name)=GridRowMinMaxMid.MidRow into MiddleGrids

8. Save the results and open as a new table
    

9. You might then convert these to points perhaps (for greater accuracy)

                 Update MiddleGrids Set obj = CreatePoint(CentroidX(obj),CentroidY(obj))

10. Then buffer the points to create your 5-foot-wide track:

11. Erase Outside to straighten the end points if desired:

12. Finally, return the object to the correct rotation (using the same anchor point as that used in step 1):

1. Rotate the polygon so that the polygon is on its side (with its straight edge running east-west). I did this by trial and error but you could calculate the angle beforehand.  Use the Rotate Object that comes with the Map Cad tool.
   
   

   

WARNING: choose the anchor point carefully when rotating; you will use this same anchor point later when reversing the rotation.

2. Use Grid Maker to create very small grid regions that cover your polygon – the smaller the more accurate.
3. Delete grid regions that are outside your region.
   
4. Perform a group by to find the min and max row value of each column:

 Select Col_Name, Min(Row_Name) "MinRow", Max(Row_Name) "MaxRow" from Grid group by Col_Name into GridRowMinMax 

5. Perform a query that returns the middle row value: 

Select Col_Name, MinRow, MaxRow, Int((MaxRow-MinRow)/2)+MinRow "MidRow" from GridRowMinMax into GridRowMinMaxMid 

6. Save this query and open as a new table 

7. Join this query to the Grid table:

Select * from Grid, GridRowMinMaxMid where Grid.Col_Name=GridRowMinMaxMid.Col_Name And Val(Grid.Row_Name)=GridRowMinMaxMid.MidRow into MiddleGrids

8. Save the results and open as a new table
    

9. You might then convert these to points perhaps (for greater accuracy)

                 Update MiddleGrids Set obj = CreatePoint(CentroidX(obj),CentroidY(obj))

10. Then buffer the points to create your 5-foot-wide track:

11. Erase Outside to straighten the end points if desired:

12. Finally, return the object to the correct rotation (using the same anchor point as that used in step 1):

1. Rotate the polygon so that the polygon is on its side (with its straight edge running east-west). I did this by trial and error but you could calculate the angle beforehand.  Use the Rotate Object that comes with the Map Cad tool.
   
   

   

WARNING: choose the anchor point carefully when rotating; you will use this same anchor point later when reversing the rotation.

2. Use Grid Maker to create very small grid regions that cover your polygon – the smaller the more accurate.
3. Delete grid regions that are outside your region.
   
4. Perform a group by to find the min and max row value of each column:

 Select Col_Name, Min(Row_Name) "MinRow", Max(Row_Name) "MaxRow" from Grid group by Col_Name into GridRowMinMax 

5. Perform a query that returns the middle row value: 

Select Col_Name, MinRow, MaxRow, Int((MaxRow-MinRow)/2)+MinRow "MidRow" from GridRowMinMax into GridRowMinMaxMid 

6. Save this query and open as a new table 

7. Join this query to the Grid table:

Select * from Grid, GridRowMinMaxMid where Grid.Col_Name=GridRowMinMaxMid.Col_Name And Val(Grid.Row_Name)=GridRowMinMaxMid.MidRow into MiddleGrids

8. Save the results and open as a new table
    

9. You might then convert these to points perhaps (for greater accuracy)

                 Update MiddleGrids Set obj = CreatePoint(CentroidX(obj),CentroidY(obj))

10. Then buffer the points to create your 5-foot-wide track:

11. Erase Outside to straighten the end points if desired:

12. Finally, return the object to the correct rotation (using the same anchor point as that used in step 1):