> For the complete documentation index, see [llms.txt](https://docs.altum.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.altum.ai/english/sustainability/building-geometry-api/output-interpretation.md).

# Output interpretation

An explanation and interpretation of every feature outputted in the API response.

<table><thead><tr><th width="299.3333333333333">Feature</th><th>Example</th><th>Explanation</th></tr></thead><tbody><tr><td>address.bag_id</td><td>0499010002023718</td><td>BAG ID</td></tr><tr><td>address.pand_id</td><td>0499100002015826</td><td>PAND ID</td></tr><tr><td>address.postcode</td><td>1234AB</td><td>Zipcode</td></tr><tr><td>address.housenumber</td><td>1</td><td>House number</td></tr><tr><td>address.houseaddition</td><td>B</td><td>House number addition</td></tr><tr><td>address.number_of_floors</td><td>2</td><td>Number of floors</td></tr><tr><td>ground_surface.ground_area</td><td>122.03668975830078</td><td>Ground floor area (m2)</td></tr><tr><td>ground_surface.perimeter</td><td>53.19795020555981</td><td>Perimeter (m)</td></tr><tr><td>ground_surface.max_length</td><td>13.936105098015044</td><td>Maximum length of the building (m)</td></tr><tr><td>ground_surface.max_width</td><td>12.699969711612086</td><td>Maximum width of the building (m)</td></tr><tr><td>roof_surface.type</td><td>sloping</td><td>Type of roof surface (horizontal or sloping)</td></tr><tr><td>roof_surface.no_of_surfaces</td><td>4</td><td>Number of roof surfaces</td></tr><tr><td><em><strong>for every roof surface</strong></em></td><td></td><td></td></tr><tr><td>surfaces.orientation</td><td>WN</td><td>Orientation of roof surface</td></tr><tr><td>surfaces.area</td><td>12.652916942719283</td><td>Area of roof surface (m2)</td></tr><tr><td>surfaces.perimeter</td><td>25.810687359706225</td><td>Perimeter of roof surface (m2)</td></tr><tr><td>surfaces.roof_angle</td><td>23.7</td><td>Angle of roof surface (degrees)</td></tr><tr><td>surfaces.geometry.type</td><td>Polygon</td><td>Geometry format</td></tr><tr><td>surfaces.geometry.coordinates</td><td>[ 105003.892, 453604.067, 3.957 ]...</td><td>Roof surface coordinates</td></tr><tr><td>wall_surface.wall_area</td><td>268.0</td><td>Total wall area (m2)</td></tr><tr><td>wall_surface.shared_wall_area</td><td>18.08</td><td>Total shared wall area (m2)</td></tr><tr><td>wall_surface.number_of_surfaces</td><td>44</td><td>Number of wall surfaces</td></tr><tr><td><em><strong>for every wall surface</strong></em></td><td></td><td></td></tr><tr><td>wall_surface.orientation</td><td>ES</td><td>Orientation of wall surface</td></tr><tr><td>wall_surface.area</td><td>0.6297902744652016</td><td>Area of wall surface (m2)</td></tr><tr><td>wall_surface.perimeter</td><td>4.574356150984596</td><td>Perimeter of wall surface (m2)</td></tr><tr><td>wall_surface.geometry.type</td><td>Polygon</td><td>Geometry format</td></tr><tr><td>wall_surface.geometry.coordinates</td><td>[ 105010.162, 453591.084, 1.815 ]...</td><td>Wall surface coordinates</td></tr></tbody></table>


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