Sanborn Map Company
20090930
Unknown
CONTOUR_1FT
vector digital data
ELEVATION_Contour_5FT_2009
withheld
Lidar generated contours covering Chatham County, GA for Metropolitan Planning Commission.
Contours consistent with the deliverables and including a certain level of smoothing. Index, Intermediate, Depression, Supplementary and Low confidence contours are coded.
en
20090930
publication date
Unknown
-81.407060
-80.822301
32.255406
31.706598
894999.997692
1067520.448910
626266.724148
820000.000066
None
Breakline
DTM
DSM
Contour
Elevation
Lidargrammetry
Lidar
None
Georgia
Chatham County
United States
This data may be used by the requested party for stated purposes and should not be re-distributed.
This data is for planning purposes only and should not be used for legal or cadastral purposes.
SAGIS
Noel Perkins
Director
mailing and physical address
110 East State Street
Savannah
GA
31412-8246
USA
912.651.1476
912.651.1480
perkinsn@thempc.org
ESRI ArcCatalog 9.2.4.1420
Feature Class
Data covers the tile scheme provided for the county and was verified for correct topology (no intersection, overlap or dangles). Metropolitan Planning Commision performed a full qualitative review of the contour data for smoothness and consistency of feature codes.
A visual qualitative assessment was performed to ensure the data completness.
The contours inherit the accuracy of the Lidar dataset it was acquired from.
Lidar source compiled to meet 1m horizontal accuracy.
0.5m
Horizontal point accuracy is a function of angular origination of the pulse; IMU orientation; the scanner encoder and ranging function and will vary depending on the proposed point density selected for the collection. Statistically, the error is roughly 1/3 of the illuminated foot print on the ground and is a function of the beam divergences.
The contours inherit the accuracy of the Lidar dataset it was acquired from.
0.49 feet
Based on the vertical accuracy testing conducted by MPC, using NSSDA and FEMA methodology, vertical accuracy at the 95% confidence level (called Accuracyz) is computed by the formula RMSEz x 1.9600. The dataset satisfies the criteria:
Countywide lidar dataset tested 0.49 ft vertical accuracy at 95% confidence level in open terrain, based on open terrain RMSEz (0.25 ft) x 1.9600.
Countywide lidar dataset tested 0.78 ft vertical accuracy at 95% confidence level in all land cover categories combined, based on consolidated RMSEz (0.40 ft) x 1.9600.
SANBORN MAP COMPANY
20090930
Unknown
LiDAR
vector digital data
LiDAR Survey of Chatham County, Georgia, conducted in the February and March of 2009
online
20090221
unknown
20090323
unknown
ground condition
LiDAR Acquisition
LiDAR dataset was used to create intensity stereopairs for 3D breakline compilation that helped constrain the contours.
The ABGPS, IMU, and raw Leica ALS-50 LiDAR data are integrated into the LEICA ALS post processor software. The resultant file is in a LAS binary file format. The LAS file version 1.1 formats can be easily transferred from one file format to another. It is a binary file format that maintains information specific to the LiDAR data (return#, intensity value, xyz, etc.). The resultant points are produced in the geodetic coordinates referenced to the NAD83 horizontal datum and GRS80 vertical datum.
withheld
withheld
withheld
2009
withheld
Sanborn Map Company
Andrew Lucero
Sr. Project Manager
mailing and physical address
1935 Jamboree Drive
Colorado Springs
CO
80920
USA
(719) 264-5645
(719) 528-5093
alucero@sanborn.com
8:00 - 5:00 MST
The unedited data are classified to facilitate the application of the appropriate feature extraction filters. A combination of proprietary filters are applied as appropriate for the production of bare earth digital terrain models (dtms). Interactive editing methods are applied to those areas where it is inappropriate or impossible to use the feature extraction filters, based upon the design criteria and/or limitations of the relevant filters. These same feature extraction filters are used to produce elevation height surfaces. The LiDAR mass points were delivered in American Society for Photogrammetry and Remote Sensing LAS 1.1 format. The header file for each dataset is complete as define by the LAS 1.1 specification. In addition the following fields are included: Flight Date Julian, Year, and Class. The LAS files do not include overlap. The data was classified as follows:
Class 1 = Unclassified. This class includes vegetation, buildings, noise etc.
Class 2 = Ground
Class 9 = Water
withheld
2009
withheld
Sanborn Map Company
Andrew Lucero
Sr. Project Manager
mailing and physical address
1935 Jamboree Drive
Colorado Springs
CO
80920
USA
(719) 264-5645
(719) 528-5093
alucero@sanborn.com
8:00-5:00 MST
Conversion from Geodetic coordinates, NAD83 into State Plane coordinates (U.S. Survey Feet) NAD83 HARN and conversion from ellipsoid heights (meters) into orthometric heights (U.S. Survey Feet).
withheld
2009
withheld
Sanborn Map Company
Andrew Lucero
Sr. Project Manager
mailing and physical address
1935 Jamboree Drive
Colorado Springs
CO
80920
USA
(719) 264-5645
(719) 528-5093
alucero@sanborn.com
8:00-5:00 MST
SANBORN used GeoCue software to develop LiDAR stereo models. The raster resolution was 1.0m.
withheld
2009
withheld
Sanborn Map Company
Andrew Lucero
Sr. Project Manager
mailing and physical address
1935 Jamboree Drive
Colorado Springs
CO
80920
USA
(719) 264-5645
(719) 528-5093
alucero@sanborn.com
8:00-5:00 MST
LiDAR intensity stereopairs were viewed in 3-D stereo using softcopy photogrammetric software, the breaklines were stereo-compiled in accordance with the Data Dictionary. The LiDARgrammetry was performed under the direct supervision of an ASPRS Certified Photogrammetrist. The breaklines conform with data format requirements outlined by the FDEM Baseline Specifications.
withheld
2009
withheld
Sanborn Map Company
Andrew Lucero
Sr. Project Manager
mailing and physical address
1935 Jamboree Drive
Colorado Springs
CO
80920
USA
(719) 264-5645
(719) 528-5093
alucero@sanborn.com
8:00-5:00 MST
Using proprietary procedures developed by SANBORN, a hydroenforced bare earth TIN was created using Terrasolid. The points were gridded ground masspoints derived from the Lidar dataset, the 3D breaklines were included in this TIN.
withheld
withheld
2009
withheld
Sanborn Map Company
Andrew Lucero
Sr. Project Manager
mailing and physical address
1935 Jamboree Drive
Colorado Springs
CO
CO80920
USA
(719) 264-5645
(719) 528-5093
alucero@sanborn.com
8:00-5:00 MST
1ft contours were modeled from a hydroenforced bare earth TIN and then smoothed and simplified using proprietary procedures developed by SANBORN in Terrasolid and ArcGIS software.
withheld
2009
withheld
Sanborn Map Company
Andrew Lucero
Sr. Project Manager
mailing and physical address
1935 Jamboree Drive
Colorado Springs
CO
80920
USA
(719) 264-5645
(719) 528-5093
alucero@sanborn.com
8:00-5:00 MST
Metadata imported.
withheld
20091016
19061900
Dataset copied.
withheld
20110223
09442900
Vector
String
0
Simple
Polyline
FALSE
0
TRUE
FALSE
coordinate pair
0.001500
0.001500
survey feet
Transverse Mercator
0.999900
-82.166667
30.000000
656166.666667
0.000000
North American Datum of 1983
Geodetic Reference System 80
6378137.000000
298.257222
GCS_North_American_1983_HARN
NAD_1983_HARN_StatePlane_Georgia_East_FIPS_1001_Feet
North American Vertical Datum of 1988
0.000500
feet
Explicit elevation coordinate included with horizontal coordinates
CONTOUR_1FT
1ft Contours
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
Feature Class
0
OBJECTID
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
OBJECTID
OID
4
10
0
DATESTAMP_DT
The date the feature was added to the geodatabase.
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
Date
DATESTAMP_DT
Date
36
0
0
SHAPE
Feature geometry.
ESRI
Coordinates defining the features.
Shape
Geometry
4
0
0
CONTOUR_TYPE_DESC
Type of contour
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
1
Intermediate
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
2
Supplementary
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
3
Depression
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
4
Index
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
5
Intermediate Low Confidence
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
6
Supplementary Low Confidence
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
7
Depression Low Confidence
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
8
Index Low Confidence
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
CONTOUR_TYPE_DESC
String
50
0
0
CONTOUR_ELEVATION_MS
Elevation value
"Florida GIS - Baseline Specifications for Orthophotography and LiDAR v1.2"
Elevation
CONTOUR_ELEVATION_MS
Double
8
38
8
Shape.len
Shape.len
Double
0
0
0
SAGIS
Noel Perkins
Director
mailing and physical address
110 East State Street
Savannah
GA
31412-8246
USA
912.651.1476
912.651.1480
perkinsn@thempc.org
Downloadable Data
The data represent the results of data collection and processing for a specific Metropolitan Planning Commission activity and indicates the general existing conditions at the time of the data collection. As such, it is only valid for its intended use, content, time, and accuracy specifications. The user is responsible for the results of any application of the data for other than its intended purpose.
20090930
Sanborn Map Company
Andrew Lucero
Sr. Project Manager
mailing and physical address
1935 Jamboree Drive
Colorado Springs
CO
80920
USA
(719) 264-5645
(719) 528-5093
alucero@sanborn.com
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile
en
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile
20110228
17344700
20180327
12433400
FALSE
20110228
17344700
1.0
FGDC CSDGM Metadata
20110228
ESRI ArcCatalog 9.3.1.3500
ELEVATION_Contour_5FT_2009
894999.997692
1067520.44891
820000.000066
626266.724148
1
-81.398539
-80.836121
32.252149
31.715068
1
ISO 19115 Geographic Information - Metadata
DIS_ESRI1.0
dataset
002
withheld
Feature Class
NAD_1983_HARN_StatePlane_Georgia_East_FIPS_1001_Feet
0