Mapping Areas that Include Open Water

I have been asked to map an entire lake, but the real focus is to map the extent of invasive plants which mainly occur along the shoreline. The lake is fairly large and irregular, so I divided the lake area into 5 parcels that I can individually map while maintaining Visual Line Of Site (VLOS) with the drone as required by the FAA regulations.

My question is.. As I cross the lake from side to side, there are a lot of photos of just water with no detail for overlaying purposes. Does it cause a problem if I include them in the processing? Can I simply eliminate those that show only water and leave the shoreline photos to be processed -- leaving a lake water gap between them? Is the tile process mostly based on the satellite coordinates in positioning the images?

Please advise me as to the best way I might be able to process these images. I'm not looking for anything 3D, just a flat tiled image. Thanks for any suggestions. --Bill

Bill Cicio 17 de Agosto de 2021 18:58

Comentário oficial

The areas with no features and just water will not likely turn out. I would recommend mapping the actual open water itself using 15% overlap and process it using our Flat Map Workflow. Then get the nearshore stuff as you normally would. All of the reconstruction is based on feature matching so if it is water and the reflections and the surface is changing it won't work. That is why water is the first thing we warn against in the Data Collection guidelines that are agreed to at the time of upload.

Zane 18 de Agosto de 2021 01:10

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3 comentários

Hi,

15% overlap, longitudinal or transverse? Will that allow not so many images of water to be lost? However, I imagine that this cannot be done in a single flight, changing the necessary overlap in zones.

IGU.INTEDIG 5 de Dezembro de 2021 13:26 0 votos

15% in both directions to try to minimize gaps. Depending the aircraft and camera you can get away with 10%. The Flat Map sections and the normal photogrammetry based processing sections would have to be processed separately.

Zane 6 de Dezembro de 2021 00:56 0 votos