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<blockquote data-quote="Earthman" data-source="post: 93278" data-attributes="member: 16717"><p>I’ve been meaning to try mapping with my Spark, but the weather has been bad. I may get a chance tomorrow to fly a trial mission, but I won’t have ground control points so I may not be able to check the accuracy of the data. Maybe I’ll fly a local football field, which is flat and may have lines I can measure as a rough check of the accuracy. In any case, I suspect that the gimbal issue mentioned above will introduce parallax errors. Note the apparent non-parallel “vertical” lines in the attached photo, which I took at 85-deg from vertical rather than 90-deg. There are fewer pixels between the “vertical” lines at the top of any square than at the “bottom” of the same square. There should be about the same number of pixels. When the post-processing software does its thing, I don’t know how this error will be handled. I don’t worry about it with my survey drones where the gimbals hold the camera looking straight down. On the other hand, there’s still some lens distortion in the photos even if the camera looks straight down, and that doesn’t seem to noticeably affect the quality of the survey,</p><p></p><p>Anyway, I’ll let you know if I find anything out.[ATTACH=full]10511[/ATTACH]</p></blockquote><p></p>
[QUOTE="Earthman, post: 93278, member: 16717"] I’ve been meaning to try mapping with my Spark, but the weather has been bad. I may get a chance tomorrow to fly a trial mission, but I won’t have ground control points so I may not be able to check the accuracy of the data. Maybe I’ll fly a local football field, which is flat and may have lines I can measure as a rough check of the accuracy. In any case, I suspect that the gimbal issue mentioned above will introduce parallax errors. Note the apparent non-parallel “vertical” lines in the attached photo, which I took at 85-deg from vertical rather than 90-deg. There are fewer pixels between the “vertical” lines at the top of any square than at the “bottom” of the same square. There should be about the same number of pixels. When the post-processing software does its thing, I don’t know how this error will be handled. I don’t worry about it with my survey drones where the gimbals hold the camera looking straight down. On the other hand, there’s still some lens distortion in the photos even if the camera looks straight down, and that doesn’t seem to noticeably affect the quality of the survey, Anyway, I’ll let you know if I find anything out.[ATTACH type="full" alt="C94CD471-2AF8-4D81-B925-D86A24D20A65.jpeg"]10511[/ATTACH] [/QUOTE]
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