001
Quantum Spatial, Inc.
20170804
OLC Grass Valley FEMA River Breaklines
vector digital data
This dataset represents the bounding river polylines generated and utilized during the hydro-flattening process for the OLC Grass Valley FEMA buffered project area (BPA) as provided by U.S. Geological Survey. The data were developed based on the Universal Transverse Mercator (UTM) 10N projection; horizontal datum of NAD83 (2011), meters and vertical datum of NAVD88 Geoid 12A, meters.
This shapefile outlines the location of the U.S. Geological Survey OLC Grass Valley FEMA Hydro-flattening Breaklines for Rivers.
20170322
20170504
Ground condition during LiDAR survey
None planned
-120.795613
-120.388552
45.665774
45.296337
None
LiDAR
Light Detection and Ranging
Hydro Flattening Breaklines
Rivers
None
Oregon
Gilliam County
Sherman County
Grass Valley
None
This dataset was contracted by U.S. Geological Survey. Information regarding the use of this dataset should be directed to the owner.
USGS, Quantum Spatial, Inc.
1
None
Hydro Flattening Breaklines - Rivers
The Hydro Flattening Breakline extent is based on a OLC Grass Valley FEMA area of interest provided by U.S. Geological Survey for the OLC Grass Valley FEMA study area.
Data coverage completeness is dictated by the original defined project area (DPA) as provided by U.S. Geological Survey.
Hydro Flattening Breakline Processing:
Class 2 LiDAR was used to create a bare earth surface model. ArcMap tools utilized rasters created within Bentley Microstation to auto-generate breaklines of inland streams and rivers with a 100 foot nominal width and manually edited where necessary. Breaklines for Lakes with surface area greater than 2 acres were generated using heads-up digitization.
Elevation values were assigned to all Inland Ponds and Lakes within ESRI ArcMap; Inland Pond and Lake Islands, Inland Stream and River Islands were assigned elevation values from within ESRI ArcMap.
All ground (ASPRS Class 2) LiDAR data inside of the collected inland breaklines were then classified to water (ASPRS Class 9) using TerraScan macro functionality. A buffer of 0.7 meters was also used around each hydro-flattened stream to reclassify points from ground (ASPRS Class 2) to Ignored Ground (ASPRS Class 10).
The breakline files were then translated to ESRI File-Geodatabase format using ESRI conversion tools.
20170804
Universal Transverse Mercator
10
0.9996
-123
0
500000
0
coordinate pair
0.01
0.01
Meters
NAD83 (2011)
Geodetic Reference System 80
298.257221
6378137
NAVD88 Geoid 12A
0.01
meters
Explicit elevation coordinate included with horizontal coordinates
OLC Grass Valley FEMA Hydro Flattening Breaklines
Hydro Flattening Breaklines
Quantum Spatial, Inc.
FID
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
Esri
Coordinates defining the features.
Quantum Spatial, Inc.
mailing
421 SW 6th Ave., Suite 800
Portland
OR
97204
USA
503-505-5100
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
20170804