Water runs downhill

(Originally published here: https://www.opendronemap.org/2018/11/water-runs-downhill/)

Animated GIF of nearshore water

Water running downhill is a challenge for elevation models derived from drone imagery. This is for a variety of reasons, some fixable, some unavoidable. The unavoidable ones include the challenges of digital terrain models derived from photogrammetric point clouds, which don’t penetrate the way LiDAR does. The avoidable ones we seek to fix in OpenDroneMap.

Animation of flow accumulation on poorly merged terrain model.
Animation of flow accumulation on poorly merged terrain model, credit Petrasova et al, 2017

 

The fixable problems include poorly merged and misaligned elevation models. Dr. Anna Petrasova’s GRASS utility r.patch.smooth is one solution to this problem when merging synoptic aerial lidar derived elevation models with patchy updates from UAVs.

Another fix for problematic datasets is built into the nascent split-merge approach for OpenDroneMap. In short, that approach takes advantage of OpenSfM’s extremely accurate and efficient hybrid structure from motion (SfM) approach (a hybrid of incremental and global SfM) to find all the camera positions for the data, and then split the data into chunks to process in sequence or in parallel (well, ok, the tooling isn’t there for the parallel part yet…). These chunks stay aligned through the process, thus allowing us to put them back together at the end.

For a while now, we’ve been in the awkward position with respect to the nickname: split-merge. It lacks a lot of merge features. You can merge the orthos with it, but not the remaining datasets. And while this will be true for a while longer, we have been experimenting a bit with the merging of these split datasets (thanks to help from Dr. Petrasova). Here for your viewing pleasure is the first merged elevation model from the split merge approach:

Digital surface model of Dar es Salaam, merged from 4 separately processed split-merge submodules.
Digital surface model of Dar es Salaam, merged from 4 separately processed split-merge submodules.

More to come!

One thought on “Water runs downhill

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s