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U.S. Department of the Interior
U.S. Geological Survey
USGS Data Initiatives for Elevation,
Streams and Topo Maps
Gary Merrill, USGS Geospatial Liaison for Carolinas
Silvia Terziotti, USGS Assoc. Geospatial Liaison for
North Carolina, Water Communities of Use
National Geospatial Program
National Enhanced Elevation
Assessment (NEEA)
4
Assessment was sponsored by the NDEP’s member agencies
and was completed in December of 2011.
Purpose was:
1. To develop strategies to better meet national elevation data needs
2. Document national-level requirements for improved elevation data.
3. Estimate the benefits and costs of meeting those requirements.
4. Evaluate new, national-level elevation program models.
Final Report (March 29, 2012)
Study participants came from 34 Federal agencies (all 50 states),
selected local government and Tribal offices, and private and Non-for-
profit organizations.
For purposes of surveys, there were 27 major Business Uses, five
enhanced elevation data Quality Levels (QLs) and five update frequency
levels included.
5
Top 10 Business Uses
National Enhanced Elevation
Assessment (NEEA)
7
Data Quality Levels
National Enhanced Elevation
Assessment (NEEA)
Approximate difference in resolution between
LiDAR data quality levels 3, 2, and 1
0.7 meter point spacing
QL2
National Enhanced Elevation
Assessment (NEEA)
8
0.35 meter point spacing
QL1
1.4 meter point spacing
QL3
State LiDAR Programs
National Enhanced Elevation
Assessment (NEEA)
10
NED Currency by Year
Acquired
80 Percent of elevation data are more
than 30 years old (up to 88 years) and
will not meet user requirements for
many applications.
National Enhanced Elevation
Assessment (NEEA)
11
NEEA Survey Analysis & and Final Report http://nationalmap.gov/3DEP/neea.html
3D Elevation Program (3DEP) http://nationalmap.gov/3DEP/
NEEA at a Glance http://pubs.usgs.gov/fs/2012/3088/
How to Obtain NED Data http://viewer.nationalmap.gov/viewer/
LiDAR Point Cloud Data Availability http://earthexplorer.usgs.gov/
LiDAR Base Specification Version 1.0 http://pubs.usgs.gov/tm/11b4/
Reference Links
13
National Geospatial Program
National Enhanced Elevation
Assessment (NEEA)
15
Assessment was sponsored by the NDEP’s member agencies
and was completed in December of 2011.
Purpose was:
1. To develop strategies to better meet national elevation data needs
2. Document national-level requirements for improved elevation data.
3. Estimate the benefits and costs of meeting those requirements.
4. Evaluate new, national-level elevation program models.
Final Report (March 29, 2012)
Study participants came from 34 Federal agencies (all 50 states),
selected local government and Tribal offices, and private and Non-for-
profit organizations.
For purposes of surveys, there were 27 major Business Uses, five
enhanced elevation data Quality Levels (QLs) and five update frequency
levels included.
16
Top 10 Business Uses
National Enhanced Elevation
Assessment (NEEA)
18
Data Quality Levels
National Enhanced Elevation
Assessment (NEEA)
Approximate difference in resolution between
LiDAR data quality levels 3, 2, and 1
0.7 meter point spacing
QL2
National Enhanced Elevation
Assessment (NEEA)
19
0.35 meter point spacing
QL1
1.4 meter point spacing
QL3
State LiDAR Programs
National Enhanced Elevation
Assessment (NEEA)
21
NED Currency by Year
Acquired
80 Percent of elevation data are more
than 30 years old (up to 88 years) and
will not meet user requirements for
many applications.
National Enhanced Elevation
Assessment (NEEA)
22
NEEA Survey Analysis & and Final Report http://nationalmap.gov/3DEP/neea.html
3D Elevation Program (3DEP) http://nationalmap.gov/3DEP/
NEEA at a Glance http://pubs.usgs.gov/fs/2012/3088/
How to Obtain NED Data http://viewer.nationalmap.gov/viewer/
LiDAR Point Cloud Data Availability http://earthexplorer.usgs.gov/
LiDAR Base Specification Version 1.0 http://pubs.usgs.gov/tm/11b4/
Reference Links
24
Questions?
25
