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Accident Scenes

rvrrat14

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Was wondering if anyone is/what you’re doing on accident scenes; wrecks specifically.

Am being asked to begin shooting these for local and state LE as part of Fire Dept.

I’ve tested and question whether deliverables are pics/movies, obliques, -90 camera angle only. I’m supposed to meet up with state guys and discuss. I believe they may use ESRI and was wondering if anyone has interfaced drone photos into ESRI.

Any help is appreciated! Thanks.
 

R Martin

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Was wondering if anyone is/what you’re doing on accident scenes; wrecks specifically.

Am being asked to begin shooting these for local and state LE as part of Fire Dept.

I’ve tested and question whether deliverables are pics/movies, obliques, -90 camera angle only. I’m supposed to meet up with state guys and discuss. I believe they may use ESRI and was wondering if anyone has interfaced drone photos into ESRI.

Any help is appreciated! Thanks.
I process everything in Pix4D and then import the DTM and ortho into ESRI. It is a pretty straight forward process. No real surprises. You will need the spatial analyst tool set to work on the DSM and DTM.
 
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rvrrat14

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I process everything in Pix4D and then import the DTM and ortho into ESRI. It is a pretty straight forward process. No real surprises. You will need the spatial analyst tool set to work on the DSM and DTM.
What accuracy is required for your/their measurements? I assume you use the model part of Pix4D? Any GCP’s?
 

R Martin

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What accuracy is required for your/their measurements? I assume you use the model part of Pix4D? Any GCP’s?
I shoot for 1/2". On bad days it strays out to 3/4". Not survey grade but close enough for government work. GCPs are used on every flight we do. The number depends upon the amount of area you are flying. 5 is the minimum number (four corners and a center point). Larger jobs (5+ acres) require more GCPs and CPs.
 
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Florida Drone Supply

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Was wondering if anyone is/what you’re doing on accident scenes; wrecks specifically.

Am being asked to begin shooting these for local and state LE as part of Fire Dept.

I’ve tested and question whether deliverables are pics/movies, obliques, -90 camera angle only. I’m supposed to meet up with state guys and discuss. I believe they may use ESRI and was wondering if anyone has interfaced drone photos into ESRI.

Any help is appreciated! Thanks.
Accident reconstruction is a hot topic for drone uses now. We get a number of inquiries on it. Depending on your level of experience and equipment, you can get some very good results. We recently put the P4 RTK through a series of mapping tests and compared it to a regular P4 as well. We ran the same mapping job using NTRIP (with and without GCP), using the base station only (with and without GCP), putting the base station over a know survey monument (with and without GCP) and flying in regular GNSS mode. In the end, your accuracy can never be better than your GSD (ground sampling distance) and with the fixed focal length on a P4, you need to stay below 200 feet to achieve 1cm per pixel. From there, with the addition of GCPs you can really get accuracy that is acceptable to just about anyone - with the exception of the professionals who have to stamp and seal their work. As @R Martin mentioned, getting within a couple centimeters is going to get the job done nearly every time.

Processing in Pix4D gives you plenty of output choices to do your analysis in any program you need to work in.

Hope that helps...and let us know if you would like any more information. Best of luck to you.
 

Florida Drone Supply

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FYI.


Pix4D Public Safety Workshop - Idaho Falls


These are great - and there are some recorded webinars about the same topic available. If anyone needs them, let us know. I know we have the links saved and easily accessible.
 
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Florida Drone Supply

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Pix4D Public Safety Webinar:

Enjoy - its excellent.
 
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BigAl07

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Was wondering if anyone is/what you’re doing on accident scenes; wrecks specifically.
I was called out to a fatality(F-Frank) here in my district yesterday. They didn't need anything like mapping etc (already had the state LIDAR unit on scene). They just needed documentation to show the angles, lanes, and trajectory of the "cargo" during the accident. Most of the pics went into NC SHP custody but they let me keep a few for "show & tell" that don't have anything "sensitive" in the image.
1284

1285

1286
 
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rvrrat14

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Initially, this is what I”m understanding they want. Just perspectives like you show. Nice work! Thanks for sharing.
 
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