Abstract: Methods, apparatus, systems, and articles of manufacture are disclosed to improve space modeling identify a category-level planogram length and category-level predictors for a category, apply a first model to transform the category-level planogram length and the category-level predictors for the category to a first-model-compatible category-level planogram length and first-model-compatible category-level predictors, generate a first sales impact value corresponding to the identified category-level planogram length for the category by using the first-model-compatible category-level planogram length and the first-model-compatible category-level predictors, generate a modified category-level planogram corresponding to a second sales impact value for the category, the modified category-level planogram generated by applying a second model to (a) the first sales impact value, (b) at least one constraint, and (c) a candidate category-level planogram of interest, and cause a spatial modification of products correspon