Our aerial photography is scanned at 600 ppi unless a higher resolution is requested. View the examples below to determine the resolution needed for your research.
File Size
The below table shows the approximate file size of 9 x 9-inch scanned air photos at various resolutions.
| Resolution | File Size (Black & White) | File Size (Color) |
|---|---|---|
| 600 ppi | 30 MB |
100 MB |
| 1200 ppi | 100 MB |
400 MB |
|
2400 ppi |
500 MB |
1500 MB |
Resolution Examples
Shown below are detailed portions of an air photo from flight AXM-1938A of Riverside County scanned at 600, 1200, and 2400 ppi. Click on the thumbnails to view the full resolution images.
| Frame AXM-39-67, May 30, 1938. | |
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