Photogrammetry uses triangulation to analyze spatial patterns on the surface of the Earth. The process uses at least two photos of the same location from different angles. By analyzing features from different angles it is possible to get detailed 3D models and maps.

Photogrammetry is useful for architecture, geologic interpretation, hazards planning and crime scene analysis. If you need to create 3D models of buildings or other objects, consider incorporating photogrammetry into your business.

Use the following resources to successfully use photogrammetry in your business:

1. Buy photogrammetry software so you can analyze the surface of the Earth.

2. Download free aerial photos for your photogrammetry project.

3. Purchase custom imagery if your photogrammetry project requires high resolution imagery, or if free imagery is not available for your area of interest.

Action Steps
The best contacts and resources to help you get it done

Purchase photogrammetry software to perform spatial and topographic analysis

Photogrammetry requires special software to analyze patterns in aerial photographs. Several software packages are available, each with different functionality and in a range of prices. No matter what your needs, there is a software package that is right for you.

I recommend: Eos Systems' PhotoModeler software allows users to create accurate 3D models from photographs. The company has multiple software packages from which to choose. ERDAS offers the Leica Photogrammetry Suite. This software package includes photogrammetric tools for a broad range of geospatial imaging applications.

Download free aerial photos to use with your photogrammetry software

Photogrammetry requires aerial photos for analysis. Multiple websites provide aerial photos available for free download. These images are available for most of the United States and are generally black and white. Freely available images are all that is required for basic analysis.

I recommend: TerraServer USA provides free imagery of the United States. Most of the imagery is black and white; however, some regions have color imagery available. GeoCommunity offers a variety of free products for download.

Hire a company to take aerial photos of a specific location for your photogrammetry needs

Free aerial photos are not available for all locations. Additionally, free imagery is generally low resolution. If your photogrammetry project requires imagery that is not available for free, purchase imagery from an imagery provider or hire someone to take custom aerial photos for you.

I recommend: MapMart offers high resolution color aerial photos for locations across the United States. The company also offers oblique imagery, allowing for buildings to be seen from an angle. Aerial Advantage utilizes blimps for low altitude aerial photography. The company also uses airplanes for high altitude imagery and large scale surveys.

Tips & Tactics

Helpful advice for making the most of this Guide

• •  While photogrammetry is a useful analysis method, satellite technology allows for more advanced analysis. If you need more complex data, consider remote sensing software to utilize satellite imagery.