A computer implemented method includes obtaining geospatial coordinates for multiple points defining boundaries of a subject property, obtaining an image of the subject property from one or more positions above the earth, identifying forms and amounts of vegetation within the boundaries of the subject property based on the image, determining carbon offset values for the forms of vegetation identified within the boundaries of the subject property, and combining the carbon offset values based on the amounts of vegetation to derive a total offset for the subject property. Carbon offset values may be determined for multiple properties and aggregated until a threshold total value is reached, forming an aggregated carbon offset. An electronic exchange may be updated with the aggregated carbon offset. Value received may be apportioned back to respective property owners.