ArcGIS Developer Help (ESRI.ArcGIS.DataSourcesRaster) 

A point in map space (easting, northing) or (longitude, latitude) with its associated uncertainty information.
Members

Name 
Description 

Compare 
Compares X, Y, M, Z, ID of this point (in that order) with that of the other point. Returns 1 if this point's value is less, 1 if greater, and 0 otherwise. Useful for sorting a group of points. 

ConstrainAngle 
Projects this point to the point on the infinite line defined by anchor and angle (in radians). If allowOpposite is true, then the point can also snap to angle + pi radians. 

ConstrainDistance 
Projects this point to the perimeter of the circle defined by radius and anchor. 

Dimension 
The topological dimension of this geometry. 

Envelope 
Creates a copy of this geometry's envelope and returns it. 

GeometryType 
The type of this geometry. 

GeoNormalize 
Shifts longitudes, if need be, into a continuous range of 360 degrees. 

GeoNormalizeFromLongitude 
Normalizes longitudes into a continuous range containing the longitude. This method is obsolete. 

ID 
The Point ID attribute. 

ImageID 
The image ID of this IMapPoint. 

IsEmpty 
Indicates whether this geometry contains any points. 

M 
The measure attribute. 

MapPointID 
The identification string of this IMapPoint. 

PointingErrorCovarianceMatrix 
The pointing error covariance matrix that is associated with this IMapPoint. 

Project 
Projects this geometry into a new spatial reference. 

PutCoords 
Sets the X and Y coordinates. 

QueryCoords 
Returns the X and Y coordinates. 

QueryEnvelope 
Copies this geometry's envelope properties into the specified envelope. 

SetEmpty 
Removes all points from this geometry. 

SnapToSpatialReference 
Moves points of this geometry so that they can be represented in the precision of the geometry's associated spatial reference system. 

SpatialReference 
The spatial reference associated with this geometry. 

VertexAttribute 
Any attribute (coordinate), except X or Y. 

X 
The X coordinate. 

Y 
The Y coordinate. 

Z 
The Z attribute. 
Inherited Interfaces
Interfaces 
Description 
IPoint 
Provides access to members that define two dimensional points. 
IGeometry 
Provides access to members that describe properties and behavior of all geometric objects. 
Classes that implement IMapPoint
Classes 
Description 
MapPoint 
Implements interface IMapPoint (a point in map space). 