ORTHOPHOTO

Orthophoto Software — Viewer & Basemap for Large GeoTIFF

STREAM is orthophoto software that streams large GeoTIFF files straight from disk and drapes them over your terrain — no cloud, no waiting. Use the imagery as a precise basemap to measure, digitize vectors and read the site alongside the elevation surface.

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What is an orthophoto?

An orthophoto (orthomosaic) is an aerial image that has been geometrically corrected so every point is shown as if viewed straight down. Because the scale is uniform, you can measure real distances and areas directly on it.

Orthophotos pair naturally with a DEM: the DEM gives elevation, the orthophoto gives visual context. STREAM shows both together.

Orthophoto Software in STREAM

Stream large orthophotos

Open gigabyte-scale GeoTIFF orthophotos; only the visible area loads in full detail, so huge mosaics stay responsive.

Drape on the terrain

Overlay the orthophoto on your DEM in 2D and 3D to read imagery and elevation together.

Basemap for digitizing

Use the imagery as a precise backdrop to measure and draw vector points, lines and areas that snap to the terrain.

From a point cloud

STREAM can also produce an orthophoto from a photogrammetry point cloud on import.

How to view and use a large orthophoto

1
Load the image
Open the orthophoto GeoTIFF; it streams out-of-core, so a multi-gigabyte mosaic opens without waiting for the whole file.
2
Confirm the georeferencing
Check the coordinate system so the image sits exactly on the DEM underneath it.
3
Drape it on the terrain
Turn the orthophoto on over the elevation surface and view it in 2D for drawing or 3D for interpretation.
4
Draw on top of it
Digitise points, lines and areas against what you can see in the image — the geometry lands on the terrain, not on a flat picture.
5
Export
Crop and export the image back to GeoTIFF, or place it in a map sheet or KMZ for sharing.