Method to generate Airport Obstruction Charts of monitored areas based on a data fusion of Synthetic Aperture Radar from space-borne platforms with high resolution optical images, multi-spectral OR hyper-spectral images, obtained by remote sensors, characterized by the following steps: A: Building a base Digital Surface Model in raster format with altimetric and spatial resolution: A1: Taking pre-existing analogue and digital images of the monitored areas; A2: Conversion of said pre-existing analogue images to digital format; A3: assuring that said images are converted to raster format; A4: Vectorization of said pre-existing images to generate a vectorial Airport Obstruction Chart; B: Detect land changes: B1: Taking new data, in raster format, acquired later in time being altimetric information, derived from interferometric data obtained by synthetic aperture radar sensors from space-borne platforms; B2: Co-registration and geo-referencing of said new data; B3: Image cropping of said new data to ensure that the entire area to be monitored is properly identified; B4: Re-sampling of said pre-existing images and said new data, so that they present the same number of pixels in row and column, representing the same monitored area; B5: Comparison of the base digital surface model with altimetric information, derived from interferometric data obtained by synthetic aperture radar sensors from space-borne platforms; B6: Detection of land changes in said comparison, in order to produce a third raster model; C: Updating the Airport Obstruction Chart: C1: Overlay of said third raster model and said vectorial Airport Obstruction Chart; C2: Identifying an Obstruction Surface through the comparison of models obtained in consecutive epochs of monitoring (t0, t1,...,tn); C3: Validation of new obstructions; C4: Updating an Airport Obstruction Chart based in said validated new obstructions; and C5: Broadcasting of said updating Airport Obstruction Chart to the competent authorities. A: Building a base Digital Surface Model in raster format with altimetric and spatial resolution: A1: Taking pre-existing analogue and digital images of the monitored areas; A2: Conversion of said pre-existing analogue images to digital format; A3: assuring that said images are converted to raster format; A4: Vectorization of said pre-existing images to generate a vectorial Airport Obstruction Chart; A1: Taking pre-existing analogue and digital images of the monitored areas; A2: Conversion of said pre-existing analogue images to digital format; A3: assuring that said images are converted to raster format; A4: Vectorization of said pre-existing images to generate a vectorial Airport Obstruction Chart; B: Detect land changes: B1: Taking new data, in raster format, acquired later in time being altimetric information, derived from interferometric data obtained by synthetic aperture radar sensors from space-borne platforms; B2: Co-registration and geo-referencing of said new data; B3: Image cropping of said new data to ensure that the entire area to be monitored is properly identified; B4: Re-sampling of said pre-existing images and said new data, so that they present the same number of pixels in row and column, representing the same monitored area; B5: Comparison of the base digital surface model with altimetric information, derived from interferometric data obtained by synthetic aperture radar sensors from space-borne platforms; B6: Detection of land changes in said comparison, in order to produce a third raster model; B1: Taking new data, in raster format, acquired later in time being altimetric information, derived from interferometric data obtained by synthetic aperture radar sensors from space-borne platforms; B2: Co-registration and geo-referencing of said new data; B3: Image cropping of said new data to ensure that the entire area to be monitored is properly identified; B4: Re-sampling of said pre-existing images and said new data, so that they present the same number of pixels in row and column, representing the same monitored area; B5: Comparison of the base digital surface model with altimetric information, derived from interferometric data obtained by synthetic aperture radar sensors from space-borne platforms; B6: Detection of land changes in said comparison, in order to produce a third raster model; C: Updating the Airport Obstruction Chart: C1: Overlay of said third raster model and said vectorial Airport Obstruction Chart; C2: Identifying an Obstruction Surface through the comparison of models obtained in consecutive epochs of monitoring (t0, t1,...,tn); C3: Validation of new obstructions; C4: Updating an Airport Obstruction Chart based in said validated new obstructions; and C5: Broadcasting of said updating Airport Obstruction Chart to the competent authorities. C1: Overlay of said third raster model and said vectorial Airport Obstruction Chart; C2: Identifying an Obstruction Surface through the comparison of models obtained in consecutive epochs of monitoring (t0, t1,...,tn); C3: Validation of new obstructions; C4: Updating an Airport Obstruction Chart based in said validated new obstructions; and C5: Broadcasting of said updating Airport Obstruction Chart to the competent authorities.