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Karen Kwsanowski
GroundPoint Technologies LLC
Chief Technical Officer
315-459-1515
17 Highland Dr
Marcellus
NY
13108
US
20220106
ArcGIS Metadata
1.0
Harford
999-999-9999
Not available
Not available
CO
99999
US
withheld
Enterprise Geodatabase Feature Class
Simplified_Contours_2019
2019-06-17
Karen Kwasnowski
document
Lidar Data Products for the Harford County, MD collection area including a 6ft Digital Elevation Model (DEM), and tiled 2ft Contours.
The lidar dataset was collected to be utilized for the creation of a digital elevation model and 2ft contours. Other uses expected.
Thom S. Salter
Pictometry International Corp.
Manager, Photogrammetric Production
585-486-0093
585-486-0098
100 Town Centre Drive, Suite A
Rochester
NY
14623
US
0900-1700
Maryland
Harford County
Geographic Names Index Service
LiDAR
EDI Thesaurus
Harford County
LiDAR
Maryland
See access and use constraints information.
Access to this data is constrained by the license agreements between Pictometry International and Harford County, MD
Access to this data is constrained by the license agreements between Pictometry International and Harford County, MD.
Esri ArcGIS 12.9.0.32739
Publication Date
2019-01-01
-112.125088
-111.678816
43.623514
43.78476
1
-76.555892
-76.546472
39.645141
39.637858
Access to this data is constrained by the license agreements between Pictometry International and Harford County, MD.
Visual checks were used to make sure all features and feature classes are complete. The following topology rules are checked and edited: Lines Must Not Overlap, Lines Must Not Have Dangles, and Lines Must Not Self Intersect.
Visual checks were used to make sure all features and feature classes are complete. The following topology rules are checked and edited: Lines Must Not Overlap, Lines Must Not Have Dangles, and Lines Must Not Self Intersect.
Visual checks were used to make sure all features and feature classes are complete.
Breaklines for hydrographic features are digitized using the intensity values of the lidar data. The hydrographic features, include water bodies (> 1 Acre), wide rivers (> 10m wide), and an artificial path representing the centerline of the wide rivers. Elevation values from the lidar data are conflated to the “z-values” of the features at 6ft intervals using QCoherent’s LP360 software. Elevation values are conflated to the artificial paths at 6ft intervals with a downstream constraint algorithm. These elevation values are copied to the vertices of the wideriver polygons to flatten the wide river from stream bank to stream bank. Elevation values for the water body polygons are added to the vertices and as an attribute to the feature class based on the minimum lidar elevation value along the shoreline of the water body. The lidar ground points within a 2 ft buffer of waterbody and wideriver polygons are removed from the terrain surface. The remaining lidar ground points and the breakline feature classes are used to create a DEM with 6ft cell resolution. The contours are created from the DEM. The contours are edited in the following manner: Lines shorter than 36ft (2 raster cells) are deleted. The contour lines are smoothed using a PAEK algorithm with a 3m smoothing tolerance. Attributes are added for 10ft, 20ft, and 50ft Index contours. The following topology rules are checked and edited: Lines Must Not Overlap, Lines Must Not Have Dangles, and Lines Must Not Self Intersect. A hillshade is created of the DEM using default ESRI illumination parameters. A Tile Index Feature Class is included and a terrain dataset is created of the lidar groundpoints and breakline features classes as well.
2019-06-17
dataset
EPSG
5.3(9.0.0)
0
Simple
FALSE
0
TRUE
FALSE