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Geospatial data — Cerros Orientales DEM

This directory holds the Digital Elevation Model (DEM) consumed by the site-planner. Heavy binaries (.tif, .zip) are never committed (see .gitignore); every developer downloads them locally following these steps.

Area of interest

Bogotá's Cerros Orientales (eastern hills), approximately:

Bound Value
Latitude 4.45° N to 4.80° N
Longitude 74.15° W to 73.95° W

Expected format: GeoTIFF (.tif), a single file, in a geographic CRS (EPSG:4326) or a projected one (MAGNA-SIRGAS / UTM); the planner reprojects when needed. Place it here as data/dem_cerros_orientales.tif.

Option A — IGAC "Colombia en Mapas" (official Colombian source)

  1. Go to https://www.colombiaenmapas.gov.co.
  2. Search for "Modelo Digital de Elevación" (Digital Elevation Model), or browse the Relieve (relief) category.
  3. Select the DEM product available for Cundinamarca / Bogotá D.C. (IGAC publishes DEMs derived from its surveys, typically at 12.5 m or 30 m).
  4. Use the area-download tool: draw or enter the bounding box from the table above.
  5. Download in GeoTIFF format. If the portal delivers a .zip, extract it and keep only the .tif.
  6. Rename it to dem_cerros_orientales.tif and place it in this directory.

Note: the IGAC portal requires free registration for downloads and its catalog changes frequently. If the product is missing or the download fails, use Option B.

Option B — Copernicus GLO-30 via OpenTopography (global alternative, 30 m)

  1. Go to https://portal.opentopography.org and create a free account (required to download global datasets).
  2. Navigate to Data > Global & Regional DEMs and choose Copernicus GLO-30 (Copernicus DEM 30 m).
  3. Under Select Coordinates, enter the bounding box:
    • Xmin (lon): -74.15 — Xmax (lon): -73.95
    • Ymin (lat): 4.45 — Ymax (lat): 4.80
  4. Output format: GeoTIFF. Launch the job and download the result (a few tens of MB for this area).
  5. Rename it to dem_cerros_orientales.tif and place it in this directory.

Quick verification

With the project environment active:

python -c "import rasterio; d = rasterio.open('data/dem_cerros_orientales.tif'); print(d.crs, d.shape, d.bounds)"

It should print the CRS, the raster dimensions, and bounds containing the area of interest. If rasterio cannot open the file, check that it is a GeoTIFF and not a portal-specific proprietary format.