Add option for selecting fixed elevation to adjust image altitudes

794
4
05-23-2018 02:17 PM
Status: Implemented
Labels (1)
MervynLotter
Regular Contributor

Under the Image Properties dialogue, there is a drop down option where one can Adjust Image Altitudes. One can currently  then Adjust using:  (1) Elevation service or (2) Digital Elevation Model. But as many drone users make use of DJI drones, and the image altitudes are based off the altitude of take off site and flight altitude, hence it would be great if you could add a third option, the ability to adjust using a fixed altitude so that one does not need to create fixed altitude elevation rasters and import them as a digital elevation models. Do see David Schwab's post for more information (Drone2Map: How to adjust image altitude in EXIF metadata from DJI Drones ). This workflow works wonderfully but can be easily simplified with some code.

 

In addition, it would also be really great if Drone2Map could lookup the Relative Altitude from image's EXIF properties to display under the Image Information dialogue box.  

 

Thank you.

4 Comments
GregAldrich

Thanks Mervyn,

I've been struggling with my maps floating what looks to be several hundreds meters above the basemap.

When I use GCPs the situation becomes worse, and I can no longer zoom in close to see what I need to see, and the map just isn't quite right.

I did get some help from Danny R at ESRI support, Thanks Danny!!

Right now I'm being a smidge impatient with the time zone thing.... they are in California, I am in Illinois.

I just processed a map using my relative altitude (50 meters) to adjust image altitude, and saw no improvement in the final product.  The image altitudes changed by about 20 meters after I clicked ok.

Is there a step that I am missing?

Thanks,

Greg

Inspire 2 with X5s 80%_60% No GCP - adjusted image altitude 50 meters

MervynLotter

Hi Greg

I experienced what your results are showing.

The important step is obtaining the correct elevation for the point where

your drone flew from, and creating the raster with a fixed altitude.

I used the Manage GCP functionality get the correct altitude using the *add

ground control points from map functionality*, to get the correct

altitude. I then created a large polygon covering the area I surveyed and

added the flight to the attribute field. Then I create the raster from that

(polygon to raster tool).

If your results are failing, try adding your raster to a Local Scene and

set the layer properties to an absolute height. I haven't tried this, but

it should show you if there is an error with your raster elevation.

Good luck.

Cheers

Mervyn

GregAldrich

Turns out - the elevations coming from my Trimble R1 are 100ft too low.

I'm a bit new to this learning as I go.

MarkBuie
Status changed to: Implemented

At Drone2Map 2.x you can now adjust Image altitudes using a constant elevation.

MarkBuie_0-1628118974758.png

Have a look at the Adjust Images Altitude documentation for more information.