The loaded images will be sorted based on the time stamp of the images. During the initial processing, all images are converted to JPG and copied to a temporary system file.
The input image file list will display information about each input image based on the metadata and EXIF tags (or imported positions) associated with the input files.
- Filename - input image file name, including the folder if it is stored in a subdirectory.
- Latitude, Longitude, Elevation - this information is obtained from the image metadata. The derivation of the elevation values can vary depending on the camera and collection platform.
- Relative Altitude - Relative Altitude may be used instead of elevation values using the Relative Altitude option. This attribute will only display for some imagery (DJI) .
- Fit Error- These statistics are reported once the tool has been run. This is the calculated minimum and maximum positioning error of the given image based on the auto-detected features in the image.
- # Observations - Once the tool has been run, each input image will display the number of identified matching features in each input image. These are the key points used in constructing the model.
- Image Size - The pixel dimensions of the input images
- Camera - The name of the camera used to collect the imagery. This value comes from the image metadata.
For drones with known low resolution positioning, Global Mapper will show a warning alerting the user and asking if the EXIF tags should be ignored. Images from drones with low resolution positioning generally do not reconstruct well unless the EXIF tags are ignored or the positions are updated manually.