GeoTIFF in ArcGIS Does Not Project Properly

Problem:

My TrueView or microdrones payloads collected dark photos on a day with low natural light (early morning, late afternoon or a cloudy day). What can I do to solve the issue?

Picture showing dark photos from a flight
Photos taken with a mdLiDAR1000UHR payload on a day that was cloudy.
Picture showing the camera settings
Camera settings.

When reviewing the quality of the photos, it is a good practice to check the settings of the camera during the acquisition, if the ISO is 1600 and the photos are dark, means that the default settings of the camera are not good enough for the light condition of your flight.

In this article we provide solutions for both issues, if you already collected data and/or if you are planning a flight in low light conditions.

Probable Resolution #1:

The flight was already performed, and the images are very dark. What can I do? There are 2 options:

  1. Leave the photos as they are, most photogrammetry software can auto adjust the color of the images before generating the orthomosaic. In this case, is recommended to raise the GSD of the orthophoto, since the image smear (blurriness) may be high.
  2. Use a 3rd party software and auto adjust the colors. This will improve the photos, provide something useful to identify features with the Image Explorer and with the colorization of the point cloud. Software like IrfanView can perform this task.

Probable Resolution #2:

I am planning to fly in low light conditions. Can I change the settings of the camera?
To change the camera settings on a TrueView or microdrones system follow these steps:

  1. Download the file: TrueView system or microdrones system.
  2. Open the file with notepad.
  3. Change the exposure time. Recommended: 1/500 for cloudy days and 1/1000 for sunny days
  4. Save the file.
  5. Copy the file to your UMS.
  6. Next time you collect data with your payload, the exposure time will be updated with the value added in the file.
Picture showing the inside of the TV and md file
Camera configuration file

Adding a GeoTIFF generated by LP360 to ArcGIS does not show in the correct location.

Currently ArcGIS, including 10.x and Pro, does not have a full implementation of Well Known Text (WKT) format for projection definitions in .prj format, specifically the COMP_CS tag and the way it handles False Easting and Standard Parallels.

This issue has been communicated to ESRI and may be fixed in the future.

Probable Resolution #1:

Two workarounds exist, for all versions of ArcGIS you can use the Define Projection geoprocessing task and re-assign the correct projection to the file.

Probable Resolution #2:

I am planning to fly in low light conditions. Can I change the settings of the camera?
To change the camera settings on a TrueView or microdrones system follow these steps:

  1. Download the file: TrueView system or microdrones system.
  2. Open the file with notepad.
  3. Change the exposure time. Recommended: 1/500 for cloudy days and 1/1000 for sunny days
  4. Save the file.
  5. Copy the file to your UMS.
  6. Next time you collect data with your payload, the exposure time will be updated with the value added in the file.
Picture showing the inside of the TV and md file
Camera configuration file

The other workaround, which only works for ArcGIS Pro, is to simply remove the .prj file from the same path as the GeoTIFF and then reload the GeoTIFF. ArcGIS will then use the projection definition from the EXIF tags of the GeoTIFF.

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