spUnionPoly.md
In FIESTA: Forest Inventory Estimation and Analysis

Union Poly Works and creates expected SF object

Code
  polyUnion
Output
  Simple feature collection with 3 features and 16 fields
  Geometry type: MULTIPOLYGON
  Dimension:     XY
  Bounding box:  xmin: -945312.3 ymin: 2386884 xmax: -860375.4 ymax: 2505111
  Projected CRS: +proj=aea +lat_0=23 +lon_0=-96 +lat_1=29.5 +lat_2=45.5 +x_0=0 +y_0=0 +datum=NAD83 +units=m +no_defs +type=crs
    REGION FORESTNUMB DISTRICTNU                     DISTRICTNA OBJECTID
  1     02         02         03 Medicine Wheel Ranger District        6
  2     02         02         03 Medicine Wheel Ranger District       NA
  3     02         02       <NA>                           <NA>        6
        ADMINFORES   REV_DATE DATA_SOURC ACCURACY REGION.1 FORESTNUMB.1
  1 99020200010343 2012/01/20         09        0       02           02
  2           <NA>       <NA>       <NA>       NA     <NA>         <NA>
  3 99020200010343 2012/01/20         09        0     <NA>         <NA>
                 FORESTNAME GIS_ACRES Shape_Leng Shape_Area
  1 Bighorn National Forest   1112790   4.942746  0.5097936
  2                    <NA>        NA         NA         NA
  3 Bighorn National Forest   1112790   4.942746  0.5097936
                          geometry  ACRES_GIS
  1 MULTIPOLYGON (((-915228.1 2... 364357.613
  2 MULTIPOLYGON (((-906037.1 2...    168.745
  3 MULTIPOLYGON (((-919246.1 2... 748054.740