Description: Tribal Government boundaries is a layer that contains the Minnesota interpretation of the federally recognized tribal boundaries within Minnesota. For the Federal interpretation see the US senses TIGER files.
Description: Tilt derivative of the reduced-to-pole Minnesota statewide aeromagnetic data. The tilt derivative is the arctangent of ratio of the first vertical derivative to the total horizontal derivative which balances display of the first derivatives and equalizes the response of deep and shallower sources. Tribal areas are excluded for those tribes that opted out for inclusion or did not respond.
Description: First vertical derivative of the reduced-to-pole Minnesota statewide aeromagnetic data. The first vertical derivative computes the magnitude of the vertical magnetic gradient with no directional bias. Tribal areas are excluded for those tribes that opted out for inclusion or did not respond.