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**Area of each record in km²:**computes area in km² and puts in field AREA_KM2.**Area of each record in m²:**computes area in m² and puts in field AREA_M2.**ALAND to LAND_KM2:**takes Census field of land area in square meters puts in field LAND_KM2. If the field is not ALAND, but something like ALAND10, you will have to pick it.**AWATER to WATER_KM2:**takes Census field of land area in square meters puts in field WATER_KM2.**Perimeter of each record:**computes perimeter in km and puts in field PERIMTR_KM.**Centroid of each record:**computes centroid of each record and puts in fields LAT_CENTRD and LON_CENTRD.**Length of each record:**computes length in km and puts in a field LENGTH_KM**Polygon shape indices**, using perimeter and area. Many of these are used for Gerrymandering- Compactness: 4piA/P^2r, iso-perimetric quotient, Polsby-Popper, Cox's circularity
- Mean width 2A / P
- Shape number (P/sqrt(A))
- Schwartzberg, 1 / (Perimeter / ( 2 * Pi * sqrt(Area/Pi)))). the ratio of perimeter to the circumference of a circle with the same area.
- Perimeter/Area ratio (P2A):

- Elevation change of each record
- Direction of record: line files only. Computes the azimuth from the first point in the line to the last point.
- Distance between two points in record: must have to LAT/LONG pairs in each record
- Distance from point using Vicenty forumula.
- Distance algorithm comparison: does Vicenty, haversine, and cosine distance formulas
- Distance to nearest neighbor:
- Distance off map: for a points database, will add a field DIST_OFF with the distance and direction for those records not on the current map
- Gradient
- Point in polygon/area: find the record within an area shapefile in which a point (or the centroid of an area/line shapefile) lies, and enter a field from that database into the current database. For instance this could find the county which contains a record. You want to be careful in picking the field to insert: for counties; the FIPS are unique, but half the states have a "Washington County".
- Sinuosity
- Number points each record
- First and last points each record. Add fields LAT_START, LONG_START, LAT_END, LONG_END.

*Last revision 5/30/2019*