Supplement 1. Expert opinion data and regression trees.

File List Expert_responses.csv (MD5: 4fc2478aea08e6be9451487596050078) CLUS_code.csv (MD5: 3d7e79e881cacde17df47743d464f50f) regression_tree_statements.txt (MD5: 1575afcb82a01c05cfa287faba5dabc7) Description responses.csv This file contains the full raw data set used in our paper, including all expert evaluation of all synthetic sites, along with the regression tree model prediction for each site. Each row represents a single expert evaluation. The variables (column names) are as follows: SiteNumber: Identifies each synthetic site. Not unique, given each site was evaluated by multiple experts. Function: Identifies whether the evaluation was assigned to the test data set, the training data set, or whether it was ignored (being one of the upper and lower sites evaluated by every expert as calibration, see text). ObsNumber: Unique identifier for the evaluation. Themeda: The basal area cover of the grass species <i>Themeda triandra</i> in the synthetic grassland site. Expressed as a percentage. OtherNativeGrassCover: The projective foliage cover of all native grasses other than <i>Themeda triandra</i> in the synthetic grassland site. Expressed as a percentage. NativeHerbCover: The projective foliage cover of all native herb (i.e., non-woody dicot) species in the synthetic grassland site. Expressed as a percentage. NativeHerbDivScale: The diversity of native herbs in the synthetic grassland site. 0= none, 1= low diversity, 2= high diversity. ExoticPerennialCover: The projective foliage cover of all exotic perennials in the synthetic grassland site. Expressed as a percentage. ExoticAnnualCover: The projective foliage cover of all exotic perennials in the synthetic grassland site. Expressed as a percentage. Derocked: A descriptive variable, whether the synthetic grassland site has been de-rocked or not (0 = rocks removed, 1= rocks intact). BareGround: The percentage cover of bare ground, expressed as a percentage. Score: The score assigned by the expert. 0-100 in 5 point increments. Re-scaled_Score: “Score” divided by 5, to fit a 0-20 scale. Prediction_20_scale: Score prediction from CLUS (see main text), using 0-20 scale. Prediction_100_scale: Score prediction from CLUS (see main text) using 0-100 scale. Expert_name: The identity of the expert who made the evaluation. Names have been converted to “Expert1-n” to protect the anonymity of the experts. Primary_Area: The primary area of expertise for the expert, described as either “Vegetation Ecology”, “Animal Ecology” or “Land Management”. Primary_Affil: The primary affiliation / place of work of the expert, described as The variables listed below are all annotated “1” if the expert self-described as being “somewhat knowledgeable” in the area, or “2” if the expert self-described as being “an expert”. Experts could annotate as many columns as they wished. Bird_ecology Mammal_Ecology Reptile_amphibian_ecology Invertebrate_ecology Botany_plant_ecology Soil_Science Geomorphology_geology General_Ecology Weed_management Grazing_management Fire_ecology Fire_management_operations Park_visitor_management Restoration_ecology Environmental_hisitory Social_history Horticulture The_arts Education Env policy indigenous land mgt The variables listed below are all annotated “1” if the expert is professionally associated with the organization (or category of organization). DEPI is the former name of DELWP, the department of the senior author. University_academic Student Local_Gov_employee DEPI_employee Parks Victoria Consultant_ecologist Contract_land_manager Community_org_member DEPI Technical Advisory Group member Royal Botanic Gardens Trust for Nature CLUS settings.csv This file contains the raw code used to run CLUS for the final regression tree ensemble (20 trees) reported in the main text. regression tree statements.txt This file contains each of the 20 regression trees (and the average / ensemble), expressed as logical (IF/THEN) statement. These statements are arranged in tab-delimited txt format, arranged in a manner that they can be opened and used in a spreadsheet which allows formulae to operate with reference to other cells. They are in a syntax suitable for use in cells in Microsoft Excel. The trees are numbered “Tree1” to “Tree20”. The cell references in the trees should operate when opened in a spreadsheet. They are referenced as follows: B2 <i>Themeda</i> basal area (percentage) B3 OtherNativeGrassCover (percentage) B4 NativeHerbCover (percentage) B5 NativeHerbDiversityScale (0=none, 1=low, 2=high) B6 Exotic PerennialCover (percentage) B7 ExoticAnnualCover (percentage) B8 BareGround (percentage) B9 Derocking (0=rocks removed, 1=not removed)