Solar - Slope Too Steep - UK

Process for generating final solar > 5% slope constraint map

1. Generate initial slope map using MapterHorn

openlibrary https://data.opensite.energy/dataset/eb94b1c5-ef85-4e9a-9fd9-7b8ed84980c5/resource/4956bb0a-7fd8-4f3c-bbd1-a8cb39f12e04/download/solar-slope-too-steep-uk.yml

1. Use QGIS to break all multipolygons into polygons for solar-slope-too-steep-uk.gpkg

2. Download OS OpenMap from https://osdatahub.os.uk/data/downloads/open/OpenMapLocal

3. Using QGIS, select "buildings" layer from OS OpenMap GPKG file and add 1m buffer.

4. Subtract 1m-buffered buildings from solar-slope-too-steep-uk.gpkg to eliminate DTM anomalies where removed buildings leave 'footprint' that incorrectly generates steep slopes around edges of buildings.

5. Using QGIS, simplify layer from [5] to 1m