Second-generation digital orthophoto imagery is becoming popular throughout the GIS industry as cost-effective, timely and able to retain accuracy.

Cost-Effective

Eliminates costs of:

1. Ground survey mobilization and GPS capture

2. Manual Aerial Triangulation methods

3. DTM/DEM capture and processing

Can fly a project at 30% sidelap and 30% overlap if stereo pairs are not desired.

Other Benefits

• Shave one to three months of project duration

• Easily incorporate areas that need updating

• Preserves initial investment of mapping previously done

Retains Accuracy

• First-generation digital orthophoto imagery must meet or exceed the desired accuracy for second-generation digital orthophoto imagery

• First-generation digital orthophoto imagery resolution needs to be equal to or higher than the second-generation to meet the same accuracy as the firstgeneration digital orthophoto imagery

• DEM/DTM must meet the horizontal accuracy for the second-generation digital orthophoto imagery

• Scans are produced at adequate resolution to meet the requirements of the secondgeneration digital orthophoto imagery

• For the single photo resection approach, should capture 9 to 16 evenly distributed photo identifiable points for every exposure

• Capture photo identifiable points that tie to adjacent images to provide for an accurate block adjustment (AT) Customer needs are paramount, and must be taken into consideration, but in many cases, a second-generation ortho product ideally suits their needs.