- Imagery must have at least 60% in-track overlap and should have at least 50% cross-track/orthogonal overlap.
- Imagery has overlap between cross-track and in-track frames. See examples below.
- Images must contain required EXIF information. [more]
- For best results: Shutter Speed >= 1/1000th, Auto ISO, White Balance setting fixed to 'Sunlight', 'Day' or 'Cloudy' depending on sky conditions.
We've also seen great results with a fixed ISO setting.
- Images are shot with one camera and focal length.
- Images are geo-tagged.
- Non-NADIR Images should be removed. (i.e. Images from turns, Landing, Takeoff)
- Images should not be pre-processed or EXIF is preserved. (i.e. Lightroom, Picassa, etc)
- Images are NADIR or near vertical. 6 megapixel or greater, 10-12 megapixel recommended.
- Images are JPEG format and no corrupt images/headers. Images are same width x height. (i.e. 4000x3000)
- Images are same aspect ratio. (i.e. 4:3 recommended)
- Flight Path should be Parallel Line (aka Lawn Mower) or other large overlapping style.
- Flight Path should provide sufficient coverage of survey area. Sufficient coverage of an area means 60% - 80% overlap, less than 50% overlap yields less data for gradient generation in that direction.
- Flight should be from sufficient elevation. (i.e. >80 meters) Flights below 50m or less should have identifiable terrain features.
- Use a GPS enabled camera with Latitude, Longitude and Elevation EXIF tags.
- EXIF tags include Camera Make, Model, Image Width, Image Height, Focal Length, DateTimeOriginal
- Geo-tag your photos using GeoSetter (GUI), exiftool (command line) or a similar tool.
Data Collection Examples with Good Results:
This sequence shows a good amount of overlap between images. A large amount of control points are detected in order to scale, rotate and mosaic. This is a small subset of over 241 images.
An example of a flight from Pteryx UAV with a large amount of overlap. This is the ideal situation.
Another example of an imagery sequence with a large amount of overlap.
DroneMapper Cloud Pricing Policy:
Contact us for pricing job quote. Average cost for cloud processing job is around $100 USD depending on area covered/GSD/GCP/etc. DroneMapper offers the highest precision and very accurate digital elevation model extraction with our proprietary photogrammetric workflow. We've been advancing the art of aerial photogrammetry pixel by pixel since 2011!