| Error number | Error message |
|---|---|
| 0 | No error. |
| 1 | Invalid number of input points (must be greater than 3). |
| 2 | Invalid dimension for latitudes in the output grid. |
| 3 | Invalid dimension for longitudes in the output grid. |
| 4 | First three nodes of input array are collinear. |
| 5 | Extrapolation failed due to the uniform grid extending too far beyond the triangulation boundary. |
| 6 | Internal algorithm error - please report this. |
| 7 | Vertex of a triangle containing an interpolation point is outside its valid range. |
| 8 | The angular distance between an interpolated point and the nearest point of the triangulation is at least 90 degrees. |
| 9 | Not enough input points to calculate a gradient. |
| 10 | Insufficient space for the triangulation (must be >= number of boundary nodes minus 2). |
| 11 | Degenerate triangle (two vertices lie on same geodesic). |
| -L | Coordinates L and M coincide for some M > L >= 1 (coordinate numbering starting at 1). |