This metadata record describes the acquisition and production of 2 foot contours for 5 coastal counties Hancock, Harrison, Jackson, Pearl River and Stone. The breaklines were collected from digital imagery with a 15 cm ground sample distance (GSD) for the project area for the 2 foot contour area and 30 cm for the 5 foot contour area. All imagery was acquired in spring 2007 and processed during the spring & summer of 2007. The imagery is from a project tasked by Mississippi Geographic Information, LLC (MGI) with Work Orders ED-9 & ED-9A. EarthData International, Inc. was authorized to undertake this project in accordance with the terms and conditions of the professional service agreement between MGI and EarthData International, Inc., dated February 14, 2007. NOTE: In late January, 2010 - MARIS staff added a variable Source_Scale to each of the 100 and 200 scale features, calculated it to its approrpriate value (100 or 200), then merged the features into this single layer. This provides refined scale delineation to allow for additional queries.
The acquisition of the planimetric features and elevation data were completed as part of the Gulf Region Base Mapping Ownership Data Development Project under a contract to Mississippi Department of Environmental Quality. This project was funded through the Community Development Block Grant (CDBG) program for the reconstruction effort in the five coastal counties. The base map collection data was designed as a resource to aid the State and local governments. This data will be posted on the Mississippi Geospatial Clearinghouse Portal as a Mississippi Digital Earth Model (MDEM) GIS layer.
publication date
Neither MDEQ, its contractors, nor any employee thereof, assumes liability associated with the use of these data and will not be liable for any damages whatsoever arising out of the use, inability to use, or results of the use of these data.
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This data has been produced to be fully compliant with the National Standard for Spatial Data Accuracy (NSSDA) at a scale for 2 foot and 5 foot contours respectively. Vertical Accuracy , as applied to contour maps on all publication scales, shall be such that not more than 10 percent of the elevation tested shall be in error more than one-half the contour interval. In checking elevations taken from the map, the apparent vertical error may be decreased by assuming a horizontal displacement within the permissble horizontal error for a map of that scale.
Compliance with the accuracy standard was ensured by the collection of photo identifiable GPS ground control after the acquisition of aerial imagery. The following checks were performed. 1. The ground control and airborne GPS data stream were validated through a fully analytical bundle aerotriangulation adjustment. The RMSE is less than 1/ 10,000th of the flying height. 2. The DSM (DEM) data was checked against the project control. The technician visited and confirmed the accuracy of the points during initial processing 3. Continuity was verified for the existing ground control within the project are on the stereo models.
The following methods are used to assure imagery accuracy. 1. Use of IMU (inertial measurment unit) and ground control network utilizing GPS techniques. 2. Use of airborne GPS (global positioning system) in conjunction with the acquisition of imagery. The following software is used for validation of the imagery and surface modeling. 1. Aerotriangulation - ISTAR 2. Bentley - MicroStation 3. ISTAR 4. ESRI - ArcView, ArcMap 5. EarthData proprietary software
This data has been produced to be fully compliant with the National Standard for Spatial Data Accuracy (NSSDA) for 100' and 1"=200' in corresponding areas.
This data has been produced to be fully compliant with the National Standard for Spatial Data Accuracy (NSSDA) for a one foot and five foot contour interval
The aerial imagery acquisition for MDEQ/MGI MS Coastal Counties was flown to support the creation of ground ortho digital photography with a 15cm GSD. The imagery was acquired in 10 lifts consisting of 128 flightlines at a height of 4782' AMT. Sidelap between flightlines is 30%. All imagery was collected using the Leica ADS40 digital pushbroom sensor.
Waggoner Engineering, Inc. was contracted by MGI & EarthData International, Inc. to acquire 58 vertical/horizontal photo-identifiable points. The ground control points were established using GPS for vertical and horizontal coordinate values. Horizontal datum is MS State Plane East NAD83/HARN, vertical is NAVD 88 both in US Survey feet.
EarthData utilized an ISTAR workflow for processing the aerotriangulation (AT) for the orthoimagery covering the MS Coastal Counties project areas. The airborne GPS data was processed and integrated with the inertial measurement unit (IMU). The resulting imagery and control were imported into the ISTAR system for use in the aerotriangulation. The ADS40 imagery was downloaded onto the EarthData server and brought over to the UNIX based ISTAR system. The ground control was used in conjunction with the processed airborne global positioning system (ABGPS) results for the AT. The ground control points were read in all available imagery and tie points between flight lines were selected. A fully analytical bundle adjustment was run. The properly formatted ISTAR results were used for subsequent processing. All final results were output into an AT report.
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Utilizing the existing imagery from the previous Mississippi orthophotography project Fugro EarthData, Inc collected breaklines to define terrian changes and physical features that are used to create one and five foot contours. The following features were collected in support of this paved road unimproved road road centerline road curb road shoulder (paved) road shoulder (unpaved) bridge, overpass, tunnel port parking (paved) parking (unpaved) drive (paved) drive (unpaved) dock/pier airport features railroad obscured area, unknown object Mass points Break lines shoreline water body, lake, canal stream, river ditch marsh piers, wharves All features were collected using Black and White stereoscopic imagery on softcopy photogrammetric workstations. Marsh area deliniation was supplemented using the landuse/landcover shape file derived from the NWI maps and updated using aerial imagery from 1992. Mainly, the estuarine systems are marsh. Created from the NHD marsh polygons and the USGS DRG (digital raster graphic available at MARIS) 200' for each County. This data was provided on a seperate shapefile: Mississippi_Coastal_Marsh_081909.shp (Overall) Gulf_Region_Marsh_Hancock_101409.gdb Gulf_Region_Marsh_Harrison_101409.gdb Gulf_Region_Marsh_Jackson_101409.gdb Gulf_Region_Marsh_Pearl_River_101409.gdb Gulf_Region_Marsh_Stone_101409.gdb Compilation of marshes was observed areas of standing water during stereo compilation Final delivery was made by individual County as well as by 1"=100' and 1"=200' areas. Shoreline was collected and the elevation as seen on the aerial imagery. Areas with varying flight dates show differences in water elevation from the ortho photography. In the seam areas between flight lines in some areas the contours were cartographically enhanced for presentation but did not diminish the accuracy of the final product. Mass points were removed from roads in order to provide an accurate presentation of the road as defined by the breaklines. Obscure area outlines may still contain data. The data in these areas may or may not meet project accuracy reqiurements. Partial destroyed or incomplete docks were not collected. Road centerlines were not collected on bridges. Only paved driveways over 100' in lengthwere compiled.
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Metadata imported.
Internal feature number.
ESRI
Feature geometry.
ESRI
Aerial Imagery
Fugro EarthData
access and use constraints of data E4
national data model
emergency service provider - internal use only
national data model
emergency service provider - bitmap display via web
national data model
emergency service provider - free distribution to third parties
national data model
emergency service provider - free distribution to third parties via internet
national data model
government agencies or thier delegated agents - internal use only
national data model
government agencies or their delegated agents - bitmap display via web
national data model
government agencies or their delegated agents - free distribution to third parties
national data model
government agencies or their delegated agents - free distribution to third parties via internet
national data model
other public or educational institutions - internal use only
national data model
other public or educational institutions bitmap display via web
national data model
other public or educational institutions - free distibutions to third parties
national data model
other public or educational institutions - free distribution to third parties via internet
national data model
data contributors - internal use only
national data model
data contributors - bitmap display via internet
national data model
data contributors - free distribution to third parties
national data model
data contributors - free distribution to third parties via internet
national data model
Public domain - internall use only
national data model
Public domain - bitmap display via web
national data model
Public domain - free distribution to third parties
national data model
Public domain - free distribution to third parties via internet
national data model
Security classification code
National data model values
unknown
national data model
top secret
national data model
secret
national data model
confidential
national data model
restricted
national data model
unclassified
national data model
sensitive
national data model
Date
ESRI
Attribute code on the quality of the data base on MDEM standards
national data model
MDEM
national data model
Non MDEM
national data model
unknown
national data model
large 1:1200
national data model
unknown or scale NA
national data model
small scale
national data model
medium scale
national data model
large scale
national data model
Length of feature in internal units.
ESRI
Numeric Value of source scale
MARIS
1 to 100 scale
1 to 200 scale
143-A LeFleurs Square
None
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