Dustin,
You are welcome! I tried your data and it seems OK. Which version you are trying to use?
Following is my code:
string wkt1 = "MULTIPOLYGON(((-179 -22,-179.31 -21.6,-179.61 -21.2,-179.92 -20.81,179.78 -20.41,179.48 -20.01,179.18 -19.61,178.88 -19.21,178.59 -18.8,178.29 -18.4,178 -18,177.5 -18.01,177 -18.01,176.5 -18.01,176 -18.02,175.5 -18.02,175 -18.02,174.5 -18.01,174 -18.01,173.5 -18.01,173 -18,172.8 -18.4,172.61 -18.8,172.41 -19.2,172.21 -19.6,172.01 -20,171.81 -20.4,171.61 -20.8,171.41 -21.2,171.2 -21.6,171 -22,171.29 -22.4,171.59 -22.8,171.88 -23.21,172.18 -23.61,172.48 -24.01,172.78 -24.41,173.08 -24.81,173.38 -25.2,173.69 -25.6,174 -26,174.6 -26.01,175.2 -26.02,175.8 -26.03,176.4 -26.03,177 -26.03,177.6 -26.03,178.2 -26.03,178.8 -26.02,179.4 -26.01,-180 -26,-179.9 -25.6,-179.79 -25.2,-179.69 -24.8,-179.59 -24.4,-179.49 -24,-179.39 -23.6,-179.29 -23.2,-179.2 -22.8,-179.1 -22.4,-179 -22)))" ;
string wkt2 = "POLYGON((0 180,180 180,180 0,0 0,0 180))";
BaseShape baseShape1 = BaseShape.CreateShapeFromWellKnownData(wkt1);
BaseShape baseShape2 = BaseShape.CreateShapeFromWellKnownData(wkt2);
AreaBaseShape areaBasShape1 = (AreaBaseShape)baseShape1;
AreaBaseShape areaBasShape2 = (AreaBaseShape)baseShape2;
MultipolygonShape m = areaBasShape1.GetDifference(areaBasShape2);
string resultWkt = m.GetWellKnownText();
Following is my result wkt string:
MULTIPOLYGON(((-179 -22,-179.1 -22.4,-179.2 -22.8,-179.29 -23.2,-179.39 -23.6,-179.49 -24,-179.59 -24.4,-179.69 -24.8,-179.79 -25.2,-179.9 -25.6,-180 -26,179.4 -26.01,178.8 -26.02,178.2 -26.03,177.6 -26.03,177 -26.03,176.4 -26.03,175.8 -26.03,175.2 -26.02,174.6 -26.01,174 -26,173.69 -25.6,173.38 -25.2,173.08 -24.81,172.78 -24.41,172.48 -24.01,172.18 -23.61,171.88 -23.21,171.59 -22.8,171.29 -22.4,171 -22,171.2 -21.6,171.41 -21.2,171.61 -20.8,171.81 -20.4,172.01 -20,172.21 -19.6,172.41 -19.2,172.61 -18.8,172.8 -18.4,173 -18,173.5 -18.01,174 -18.01,174.5 -18.01,175 -18.02,175.5 -18.02,176 -18.02,176.5 -18.01,177 -18.01,177.5 -18.01,178 -18,178.29 -18.4,178.59 -18.8,178.88 -19.21,179.18 -19.61,179.48 -20.01,179.78 -20.41,-179.92 -20.81,-179.61 -21.2,-179.31 -21.6,-179 -22)))
Any more questions just let me know.
Thanks.
Yale