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Two images show the same cliff region, one has fewer data points by eliminating the frothy beach waves.
Fort Funston Structure-from-Motion point clouds
Fort Funston Structure-from-Motion point clouds
Fort Funston Structure-from-Motion point clouds

As part of the Remote Sensing of Coastal Change and Florence Supplemental projects we have been developing novel workflows for repeat-mapping of ­­­coastal environments at order decimeter resolution over up to hundreds of kilometers in a single day, using Structure-from-Motion photogrammetry or SfM, from crewed aerial platforms.

As part of the Remote Sensing of Coastal Change and Florence Supplemental projects we have been developing novel workflows for repeat-mapping of ­­­coastal environments at order decimeter resolution over up to hundreds of kilometers in a single day, using Structure-from-Motion photogrammetry or SfM, from crewed aerial platforms.

Map shows 10.3.18 flood event viewer data for Hurricane Florence
USGS science on a map of the Carolinas after Hurricane Florence
USGS science on a map of the Carolinas after Hurricane Florence
USGS science on a map of the Carolinas after Hurricane Florence

This flood event viewer map, dated Oct. 3, 2018, shows the extent and type of information collected by USGS hydrologists in North and South Carolina in the wake of historic flooding brought on by Hurricane Florence.

This flood event viewer map, dated Oct. 3, 2018, shows the extent and type of information collected by USGS hydrologists in North and South Carolina in the wake of historic flooding brought on by Hurricane Florence.

A hydrographer checks a high water mark on a door frame
Double-checking a high water mark on a church door near Maxton, NC
Double-checking a high water mark on a church door near Maxton, NC
Double-checking a high water mark on a church door near Maxton, NC

USGS hydrographer Daniel McCay uses a level to double-check a high water mark on a church door near Maxton, NC as his USGS colleague Mary Winsor observes on Sept. 25, 2018, in the wake of flooding brought on by Hurricane Florence.

USGS hydrographer Daniel McCay uses a level to double-check a high water mark on a church door near Maxton, NC as his USGS colleague Mary Winsor observes on Sept. 25, 2018, in the wake of flooding brought on by Hurricane Florence.

A hydrographer marks a high water mark on the eaves of a church
A high water mark above the eaves of a Spring Hill, NC house
A high water mark above the eaves of a Spring Hill, NC house
A high water mark above the eaves of a Spring Hill, NC house

USGS hydrologic technician Rob Forde flags a high water mark above the eaves at Presbyterian Church of the Covenant, 118 Manchester Road, Spring Hill, North Carolina on Sept. 21, 2018, in the wake of flooding brought on by Hurricane Florence.

USGS hydrologic technician Rob Forde flags a high water mark above the eaves at Presbyterian Church of the Covenant, 118 Manchester Road, Spring Hill, North Carolina on Sept. 21, 2018, in the wake of flooding brought on by Hurricane Florence.

A hydrographer kneels in water to measure a high water mark on a wall.
Measuring a high water mark as flooding recedes
Measuring a high water mark as flooding recedes
Measuring a high water mark as flooding recedes

USGS hydrographer Kyle Marchman measures a high water mark on the rear wall of a Kangaroo gas station on Highway 24 north of Fayetteville, NC on Sept. 18, 2018, after flooding caused by Hurricane Florence.

USGS hydrographer Kyle Marchman measures a high water mark on the rear wall of a Kangaroo gas station on Highway 24 north of Fayetteville, NC on Sept. 18, 2018, after flooding caused by Hurricane Florence.

USGS intern James Stonecypher measures Lumber River floodwaters
Measuring the Lumber River floodwaters
Measuring the Lumber River floodwaters
Measuring the Lumber River floodwaters

James Stonecypher measures flood waters from the Lumber River that breached a dam in Lumberton, North Carolina after the passage of Hurricane Florence, Sept. 17, 2018. 

James Stonecypher measures flood waters from the Lumber River that breached a dam in Lumberton, North Carolina after the passage of Hurricane Florence, Sept. 17, 2018.