70 IEEE GEOSCIENCE AND REMOTE SENSING MAGAZINE JUNE 2021 SAM as GT O1/2-NMF PLMM ELMM NLHTV FCLSU SUnSAL SULoRA ALMM 1 FIGURE 9. A visualization of the abundance maps estimated by different SOTA SU algorithms on the urban data, where the spectral angle mapper (SAM) is computed to generate the classificationlike maps that are regarded as the ground truth to measure the shape similarity of the abundance maps obtained by different SU methods. Roof Trees Grass Asphalt