{"artifact_id":"L1-285","layer":"L1","title":"Satellite Gravity Recovery — GRACE/GRACE-FO mass change","domain":"Geophysics","sub_domain":"Time-variable gravity (mass change) from GRACE","physics_fingerprint":{"L_DAG":3.5,"title":"Satellite Gravity Recovery — GRACE/GRACE-FO mass change","domain":"Geophysics","carrier":"mechanical","primitives":["L.orbit_perturbation","L.spherical_harm_decomp","L.destripe","int.temporal"],"sub_domain":"Time-variable gravity (mass change) from GRACE","noise_model":"gaussian","problem_class":"linear_inverse","solution_space":"monthly_mass_anomaly_grid","difficulty_delta":5,"integration_axis":"temporal","sensing_mechanism":"grace_lri"},"observable_profile":{"metric":"mass_anomaly_rel_error_percent","regime":"Conditional stability; mismatch parameters dominate at Omega bounds.","secondary":"SSIM"},"size_tiers":{"center_spec":{"omega":{"SNR_dB":30,"N_months":200,"N_harmonics":60,"orbit_error":0.0,"leakage_error":0.0,"striping_error":0.0,"glacial_isostatic_bias":0.0},"input_format":"measurement_only","problem_class":"grace","forward_operator":"grace_forward","epsilon_fn_center":"3.0"},"omega_bounds":{"SNR_dB":[0,40],"N_months":[24,400],"N_harmonics":[10,300],"orbit_error":[0.0,0.1],"leakage_error":[0.0,0.3],"striping_error":[0.0,0.3],"glacial_isostatic_bias":[0.0,0.3]},"epsilon_bounds":{"mass_rel":[0.5,30.0]},"allowed_problem_classes":["grace"],"allowed_omega_dimensions":["N_months","N_harmonics","SNR_dB","orbit_error","striping_error","leakage_error","glacial_isostatic_bias","orbit_error","striping_error","leakage_error","glacial_isostatic_bias"],"allowed_forward_operators":["grace_forward"]},"hardness_fn":{"type":"epsilon_fn","delta":5,"kappa":600,"metric":"mass_anomaly_rel_error_percent"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0x4a5a02974e4fc1e476f4681383d20f18cd2a8dd489d7cd0f644c07c0adac0e69","chain_tx_hash":"0x5e9a9d4b58f31fb3c3eb95ceba79ce660700ebfb3e574f3de086c32b0e889feb","chain_block":41554065}