A computer-implemented method for compressing data representing values of a physical attribute in a predetermined space, the method comprising: - providing a signal ( c N,000) that includes a mapping from leaf cells of a hierarchical subdivision of the predetermined space each onto a respective coefficient representative of a value of the physical attribute at the respective leaf cell, - determining a discrete wavelet transform of the signal with a predetermined basis of wavelet convolution filters, thereby recursively determining subbands, including a low-pass subband ( c D,000), by passing, at each current recursion, each wavelet convolution filter ( f l) over the low-pass subband ( c D +1,000) of the previous recursion ( D +1), starting from the signal ( c N, 000), the subbands ( c D,l) determined at a current recursion each including a respective mapping ( c D,l (•)) from leaf cells, of a same hierarchical subdivision of which the hierarchical subdivision of the previous recursion ( D +1) is a subdivision, each given leaf cell being mapped onto a respective coefficient determined, during the passing of a respective wavelet convolution filter ( f l) over the low-pass subband ( c D +1,000) of the previous recursion ( D +1), by applying the respective wavelet convolution filter (f l) to the coefficients (c D+1,000 (a D 1* a D 2*...a D D* a D +1 D +1)) of the low-pass subband ( c D+1,000) of the previous recursion ( D +1) mapped onto from leaf cells of the hierarchical subdivision of the previous recursion ( D +1) that subdivide the given leaf cell, - encoding the determined discrete wavelet transform, characterized in that at least at one given recursion the passing encounters at least one leaf cell of the low-pass subband ( c D +1,000) of the previous recursion ( D +1) mapped onto no coefficient, the determining of a discrete wavelet transform including assigning a value ( c' D+1,000 ( a D+ 1 1' a D+ 1 2'...a D+ 1 D+ 1')) to the encountered cell, the assigned value being inputted to each of the wavelet convolution filters, wherein the assigned value is determined with respect to a criterion related to forcing one or more zeros in the subbands determined at the given recursion, wherein the criterion is that the number of coefficients of all the subbands determined at the given recursion not forced to zero is equal to the number of coefficients of the low-pass subband of the previous recursion ( D +1) not forced to zero and also characterized by adding information indicating which leaf cells of the initial hierarchical subdivision are mapped onto a coefficient. - providing a signal ( c N,000) that includes a mapping from leaf cells of a hierarchical subdivision of the predetermined space each onto a respective coefficient representative of a value of the physical attribute at the respective leaf cell, - determining a discrete wavelet transform of the signal with a predetermined basis of wavelet convolution filters, thereby recursively determining subbands, including a low-pass subband ( c D,000), by passing, at each current recursion, each wavelet convolution filter ( f l) over the low-pass subband ( c D +1,000) of the previous recursion ( D +1), starting from the signal ( c N, 000), the subbands ( c D,l) determined at a current recursion each including a respective mapping ( c D,l (•)) from leaf cells, of a same hierarchical subdivision of which the hierarchical subdivision of the previous recursion ( D +1) is a subdivision, each given leaf cell being mapped onto a respective coefficient determined, during the passing of a respective wavelet convolution filter ( f l) over the low-pass subband ( c D +1,000) of the previous recursion ( D +1), by applying the respective wavelet convolution filter (f l) to the coefficients (c D+1,000 (a D 1* a D 2*...a D D* a D +1 D +1)) of the low-pass subband ( c D+1,000) of the previous recursion ( D +1) mapped onto from leaf cells of the hierarchical subdivision of the previous recursion ( D +1) that subdivide the given leaf cell, - encoding the determined discrete wavelet transform,