A slope stability monitoring apparatus comprising: a Radar or Lidar that records movement data indicative of movement of an observed slope or wall; a processor that: corrects the movement data for apparent movement that is not wall or slope related by: recording UnCorrected Deformation data of movement data in the monitored area; spatially averaging the UnCorrected Deformation data to produce Background Deformation data with minimal effect from small area movement; temporally averaging the Background Deformation data to produce Background Deformation averaged data (BDa) with primary effect from slow moving large areas; subtracting the Background Deformation data from the UnCorrected Deformation data to produce Background Subtracted Deformation data with minimal effect from large area movement; deriving a correction factor from the Background Deformation averaged data (BDa); applying the correction factor to produce Corrected Background Deformation averaged data (CBDa); and producing Multiscale Deformation data based on the Corrected Background Deformation averaged data (CBDa) and the Background Subtracted Deformation data; processes the Multiscale Deformation data to produce deformation maps indicative of movement of the observed slope or wall over time; and generates alarms indicating wall or slope movement above a threshold; and a display that displays the deformation maps and alarms. a Radar or Lidar that records movement data indicative of movement of an observed slope or wall; a processor that: corrects the movement data for apparent movement that is not wall or slope related by: recording UnCorrected Deformation data of movement data in the monitored area; spatially averaging the UnCorrected Deformation data to produce Background Deformation data with minimal effect from small area movement; temporally averaging the Background Deformation data to produce Background Deformation averaged data (BDa) with primary effect from slow moving large areas; subtracting the Background Deformation data from the UnCorrected Deformation data to produce Background Subtracted Deformation data with minimal effect from large area movement; deriving a correction factor from the Background Deformation averaged data (BDa); applying the correction factor to produce Corrected Background Deformation averaged data (CBDa); and producing Multiscale Deformation data based on the Corrected Background Deformation averaged data (CBDa) and the Background Subtracted Deformation data; processes the Multiscale Deformation data to produce deformation maps indicative of movement of the observed slope or wall over time; and generates alarms indicating wall or slope movement above a threshold; and corrects the movement data for apparent movement that is not wall or slope related by: recording UnCorrected Deformation data of movement data in the monitored area; spatially averaging the UnCorrected Deformation data to produce Background Deformation data with minimal effect from small area movement; temporally averaging the Background Deformation data to produce Background Deformation averaged data (BDa) with primary effect from slow moving large areas; subtracting the Background Deformation data from the UnCorrected Deformation data to produce Background Subtracted Deformation data with minimal effect from large area movement; deriving a correction factor from the Background Deformation averaged data (BDa); applying the correction factor to produce Corrected Background Deformation averaged data (CBDa); and producing Multiscale Deformation data based on the Corrected Background Deformation averaged data (CBDa) and the Background Subtracted Deformation data; recording UnCorrected Deformation data of movement data in the monitored area; spatially averaging the UnCorrected Deformation data to produce Background Deformation data with minimal effect from small area movement; temporally averaging the Background Deformation data to produce Background Deformation averaged data (BDa) with primary effect from slow moving large areas; subtracting the Background Deformation data from the UnCorrected Deformation data to produce Background Subtracted Deformation data with minimal effect from large area movement; deriving a correction factor from the Background Deformation averaged data (BDa); applying the correction factor to produce Corrected Background Deformation averaged data (CBDa); and producing Multiscale Deformation data based on the Corrected Background Deformation averaged data (CBDa) and the Background Subtracted Deformation data; processes the Multiscale Deformation data to produce deformation maps indicative of movement of the observed slope or wall over time; and generates alarms indicating wall or slope movement above a threshold; and a display that displays the deformation maps and alarms.