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Elevation Contours - 2' from lidar
Identification Information
Citation Information
Originator
MEGIS
Publication Date
4/8/2013
Publication Time
Unknown
Title
Elevation Contours - 2' from lidar
Geospatial Data Presentation Form
vector digital data
Series Name
Maine GIS
Issue Identification
SDE server; Internet Data Catalog
Publication Place
Augusta ME
Publisher
Maine Office of Geographic Information Systems (MEGIS)
Other Citation Details
This layer will be available on the state SDE database and published on the MEGIS internet data catalog.
Online Linkage
http://megis.maine.gov/catalog/
Abstract
CONTOURS_2FT contains 2 foot interval contour lines for the entire area of Maine for which lidar has been collected. The data were created from the 2m DEM (see metadata for that layer for full details). The contours were created using GDAL 1.8 (gdal_contour -a elevation -i .6096 -off 0).
Purpose
The Contours were originally derived from the LiDAR data sets, including Bare Earth and a Gridded DEMs. The contours were created primarily for determining areas of potential flooding. They are also useful to determine drainage, for hydrology studies, for determining slope and for delineating watersheds.
Time Period of Content
Beginning Date
20060410
Beginning Time
Unknown
Ending Date
20120428
Ending Time
Unknown
Currentness Reference
ground condition
Status
Progress
In work
Maintenance and Update Frequency
irregular - as lidar are available
Bounding Coordinates
West Bounding Coordinate
-72
East Bounding Coordinate
-66
North Bounding Coordinate
48
South Bounding Coordinate
43
Keywords
Theme
relief, topography, contours (Maine GIS Thesaurus-Theme)
Theme
hypsography, contours (Maine GIS Thesaurus-Theme)
Place
Maine, United States, York County, Cumberland County, Augusta (Maine GIS Thesaurus-Place)
Stratum
land surface (GCMD Parameter Keyword)
Access Constraints
none
Use Constraints
none
Contact Organization
(MEGIS) Maine Office of Geographic Information Systems
Contact Person
GIS Coordinator
Contact Position
GIS Coordinator
Address Type
mailing address
Address
State House Station 145
City
Augusta
State or Province
ME
Postal Code
04333-0145
Country
USA
Contact Voice Telephone
207 624-7700
Contact Facsimile Telephone
Hours of Service
Monday through Friday 0800 - 1700 EST
Data Set Credit
Credit should always be given to the data source and/or originator when the data is transferred or printed.
Native Data Set Environment
ArcSDE raster v. 9.3.1 (SQL Server)
Attribute Accuracy Report
Attribute accuracy is based entirely on the underlying DEM.
Logical Consistency Report
Spatial topology is clean and free of errors.
Completeness Report
Data set is complete for the area currently mapped.
Horizontal Positional Accuracy Report
Horizontal accuracy is not relevant with lidar as the horizontal position is presumed to be absolute - vertical accuracy is the relevant measure at a specified point.
Horizontal Positional Accuracy Value
n/a - the DEM resolution was 2m from which these contours were made
Horizontal Positional Accuracy Explanation
RMSEz 15 cm
Vertical Positional Accuracy Report
The vertial accuracy of the source data meet or exceed vertical National Map Accuracy Standards for 2-foot contour mapping.
Vertical Positional Accuracy Value
1
Vertical Positional Accuracy Explanation
RMSEz 15cm
Citation Information
Originator
MEGIS
Publication Date
4/08/2013
Publication Time
Unknown
Title
2' contours from lidar
Geospatial Data Presentation Form
vector line features
Publication Place
Augusta ME
Publisher
Maine Office of Geographic Information Systems (MEGIS)
Other Citation Details
MEGIS, USGS, USDA, FEMA
Online Linkage
Beginning Date
Beginning Time
Unknown
Ending Date
Ending Time
Unknown
[smcisrcc]
ground condition
Type of Source Media
online distribution
Beginning Date
Beginning Time
Unknown
Ending Date
Ending Time
Unknown
Source Currentness Reference
ground condition
Source Citation Abbreviation
LiDAR
Source Contribution
LIDAR (Light Detection and Ranging) is an optical remote sensing technology that measures properties of scattered light to find range and/or other information of a distant target. In this time period it is one of the more accurate means of determining elevation accurately by remote sensing. Sanborn Map Company furnished the collection, processing, and development of LiDAR for 584 square miles in Maine (215 square miles in York County, 369 square miles in Cumberland County) to support the FEMA Region 1 Map Modernization. All data was acquired between 2006 and 2012.
Process Description
Various lidar collections were combined into a single 2m DEM using ArcGIS mosaic raster tool (blend method for overlaps). GDAL 1.8 was used to generate 2' contours. Some manual cleanup ensued in marine waters.
Process Date
04/08/2013
Source Produced Citation Abbreviation
LiDAR
Contact Person
GIS Manager
Contact Organization
MEGIS
Contact Position
GIS Manager
Address Type
mailing and physical address
Address
1935 Jamboree Drive, Suite 100
Address
City
Colorado Springs
State or Province
CO
Postal Code
80920
Country
USA
Contact Voice Telephone
719-528-5093
Contact Facsimile Telephone
719-528-5093
Process Description
The LIDAR data are calibrated for geographic referencing. Points are further processed, using TerraSolid? software, to classify return values. The first and last return data is filtered to remove the vegetation and above ground manmade features to yield a ground surface. The Bare Earth was then used to produce a 6' GRID DEM and a TIN. Independent checkpoint were used to validate the overall surface accuracy and have been provided and documented in a Lidar Acquisition Report. Utilizing the TIN, 2 foot contours were generated.
Source Used Citation Abbreviation
LiDAR
Process Date
2006/11/31
Contact Person
Andy Lucero
Contact Organization
Sanborn Mapping Compant
Contact Position
Project Manager
Address Type
mailing and physical address
Address
1935 Jamboree Dr, Suite 100
City
Colorado Springs
State or Province
CO
Postal Code
80920
Country
USA
Contact Voice Telephone
719-264-5645
Contact Facsimile Telephone
719-528-5093
Process Description
Additional 2 foot contour data was added to the data set in the area of Augusta. The metadata was updated accordingly.
Process Date
02/09/2009
Contact Organization
(MEGIS) Maine Office of Geographic Information Systems
Contact Person
Larry Harwood
Contact Position
Programmer Analyst
Address Type
mailing address
Address
State House Station 174
City
Augusta
State or Province
ME
Postal Code
04333-0174
Country
USA
Contact Voice Telephone
(207) 624-7700
Contact Facsimile Telephone
(207) 287-3842
Hours of Service
Monday through Friday 0800 - 1700 EST
Cloud Cover
0
Direct Spatial Reference Method
Vector
SDTS Point and Vector Object Type
String
Point and Vector Object Count
325339
[smcaptur]
false
Planar Coordinate Encoding Method
Planar Distance Units
meters
Horizontal Datum Name
North American Datum of 1983
Ellipsoid Name
Geodetic Reference System 80
Semi-major Axis
6378137
Denominator of Flattening Ratio
298.257
Altitude Datum Name
National Geodetic Vertical Datum of 1988
Altitude Resolution
2
Altitude Distance Units
feet
Altitude Encoding Method
Attribute values
Entity Type Label
CONTOURS
Entity Type Definition
arc feature class
Entity Type Definition Source
Environmental Systems Research Institute, Inc. (ESRI)
Attribute Label
ELEVATION
Attribute Definition
elevation of arc in feet
Enumerated Domain Value
from 74 to 282 in 2 foot intervals
Enumerated Domain Value Definition
ground elevation
Beginning Date of Attribute Values
11/10/2006
Ending Date of Attribute Values
11/26/2006
Attribute Label
LAYER
Attribute Definition
type of arc
Enumerated Domain Value
INTERCON
Enumerated Domain Value Definition
unknown
Beginning Date of Attribute Values
11/10/2006
Ending Date of Attribute Values
11/26/2006
Entity and Attribute Overview
The Terrain data package is made up of several data themes containing primarily spatial information. These data supplement the Elevation datasets by providing additional information to aid flood risk evaluation and flood hazard area delineations
Entity and Attribute Detail Citation
The ArcView shapefile and ArcGIS geodatabase formats, commonly used for Maine GIS data, carry default identifiers and attributes that are software generated and/or important for internal recordkeeping. These are listed here to avoid repetition for every layer, and may not be repeated in the attribute descriptions and definitions of each layer. Common software generated identifiers and attributes in Maine GIS data include: FID (feature identifier), Shape (feature geometry), OBJECTID and SHAPE_lengt. In addition, most GIS formats will carry fields for PERIMETER, AREA and/or LENGTH according to feature geometry. These fields are typically available by default, with the units based on coordinate system or projection units of GIS data. Most GIS software packages also provide a means to calculate these values. It is important to test any columns containing PERIMETER, AREA or LENGTH values before using them for analysis purposes. These important values can be carried from format to format and become out-dated. Verify that the values are correct. Also, in your GIS software, please view the properties of data layers for the map units used to calculate these fields, and for the units set for display purposes.
Entity and Attribute Overview
The Terrain data package is made up of several data themes containing primarily spatial information. These data supplement the Elevation datasets by providing additional information to aid flood risk evaluation and flood hazard area delineations
Entity and Attribute Detail Citation
The ArcView shapefile and ArcGIS geodatabase formats, commonly used for Maine GIS data, carry default identifiers and attributes that are software generated and/or important for internal recordkeeping. These are listed here to avoid repetition for every layer, and may not be repeated in the attribute descriptions and definitions of each layer. Common software generated identifiers and attributes in Maine GIS data include: FID (feature identifier), Shape (feature geometry), OBJECTID and SHAPE_lengt. In addition, most GIS formats will carry fields for PERIMETER, AREA and/or LENGTH according to feature geometry. These fields are typically available by default, with the units based on coordinate system or projection units of GIS data. Most GIS software packages also provide a means to calculate these values. It is important to test any columns containing PERIMETER, AREA or LENGTH values before using them for analysis purposes. These important values can be carried from format to format and become out-dated. Verify that the values are correct. Also, in your GIS software, please view the properties of data layers for the map units used to calculate these fields, and for the units set for display purposes.
Entity and Attribute Overview
The Terrain data package is made up of several data themes containing primarily spatial information. These data supplement the Elevation datasets by providing additional information to aid flood risk evaluation and flood hazard area delineations
Entity and Attribute Detail Citation
The ArcView shapefile and ArcGIS geodatabase formats, commonly used for Maine GIS data, carry default identifiers and attributes that are software generated and/or important for internal recordkeeping. These are listed here to avoid repetition for every layer, and may not be repeated in the attribute descriptions and definitions of each layer. Common software generated identifiers and attributes in Maine GIS data include: FID (feature identifier), Shape (feature geometry), OBJECTID and SHAPE_lengt. In addition, most GIS formats will carry fields for PERIMETER, AREA and/or LENGTH according to feature geometry. These fields are typically available by default, with the units based on coordinate system or projection units of GIS data. Most GIS software packages also provide a means to calculate these values. It is important to test any columns containing PERIMETER, AREA or LENGTH values before using them for analysis purposes. These important values can be carried from format to format and become out-dated. Verify that the values are correct. Also, in your GIS software, please view the properties of data layers for the map units used to calculate these fields, and for the units set for display purposes.
Entity and Attribute Overview
The Terrain data package is made up of several data themes containing primarily spatial information. These data supplement the Elevation datasets by providing additional information to aid flood risk evaluation and flood hazard area delineations
Entity and Attribute Detail Citation
The ArcView shapefile and ArcGIS geodatabase formats, commonly used for Maine GIS data, carry default identifiers and attributes that are software generated and/or important for internal recordkeeping. These are listed here to avoid repetition for every layer, and may not be repeated in the attribute descriptions and definitions of each layer. Common software generated identifiers and attributes in Maine GIS data include: FID (feature identifier), Shape (feature geometry), OBJECTID and SHAPE_lengt. In addition, most GIS formats will carry fields for PERIMETER, AREA and/or LENGTH according to feature geometry. These fields are typically available by default, with the units based on coordinate system or projection units of GIS data. Most GIS software packages also provide a means to calculate these values. It is important to test any columns containing PERIMETER, AREA or LENGTH values before using them for analysis purposes. These important values can be carried from format to format and become out-dated. Verify that the values are correct. Also, in your GIS software, please view the properties of data layers for the map units used to calculate these fields, and for the units set for display purposes.
Entity and Attribute Overview
The Terrain data package is made up of several data themes containing primarily spatial information. These data supplement the Elevation datasets by providing additional information to aid flood risk evaluation and flood hazard area delineations
Entity and Attribute Detail Citation
The ArcView shapefile and ArcGIS geodatabase formats, commonly used for Maine GIS data, carry default identifiers and attributes that are software generated and/or important for internal recordkeeping. These are listed here to avoid repetition for every layer, and may not be repeated in the attribute descriptions and definitions of each layer. Common software generated identifiers and attributes in Maine GIS data include: FID (feature identifier), Shape (feature geometry), OBJECTID and SHAPE_lengt. In addition, most GIS formats will carry fields for PERIMETER, AREA and/or LENGTH according to feature geometry. These fields are typically available by default, with the units based on coordinate system or projection units of GIS data. Most GIS software packages also provide a means to calculate these values. It is important to test any columns containing PERIMETER, AREA or LENGTH values before using them for analysis purposes. These important values can be carried from format to format and become out-dated. Verify that the values are correct. Also, in your GIS software, please view the properties of data layers for the map units used to calculate these fields, and for the units set for display purposes.
Entity and Attribute Overview
The Terrain data package is made up of several data themes containing primarily spatial information. These data supplement the Elevation datasets by providing additional information to aid flood risk evaluation and flood hazard area delineations
Entity and Attribute Detail Citation
The ArcView shapefile and ArcGIS geodatabase formats, commonly used for Maine GIS data, carry default identifiers and attributes that are software generated and/or important for internal recordkeeping. These are listed here to avoid repetition for every layer, and may not be repeated in the attribute descriptions and definitions of each layer. Common software generated identifiers and attributes in Maine GIS data include: FID (feature identifier), Shape (feature geometry), OBJECTID and SHAPE_lengt. In addition, most GIS formats will carry fields for PERIMETER, AREA and/or LENGTH according to feature geometry. These fields are typically available by default, with the units based on coordinate system or projection units of GIS data. Most GIS software packages also provide a means to calculate these values. It is important to test any columns containing PERIMETER, AREA or LENGTH values before using them for analysis purposes. These important values can be carried from format to format and become out-dated. Verify that the values are correct. Also, in your GIS software, please view the properties of data layers for the map units used to calculate these fields, and for the units set for display purposes.
Entity and Attribute Overview
The Terrain data package is made up of several data themes containing primarily spatial information. These data supplement the Elevation datasets by providing additional information to aid flood risk evaluation and flood hazard area delineations
Entity and Attribute Detail Citation
The ArcView shapefile and ArcGIS geodatabase formats, commonly used for Maine GIS data, carry default identifiers and attributes that are software generated and/or important for internal recordkeeping. These are listed here to avoid repetition for every layer, and may not be repeated in the attribute descriptions and definitions of each layer. Common software generated identifiers and attributes in Maine GIS data include: FID (feature identifier), Shape (feature geometry), OBJECTID and SHAPE_lengt. In addition, most GIS formats will carry fields for PERIMETER, AREA and/or LENGTH according to feature geometry. These fields are typically available by default, with the units based on coordinate system or projection units of GIS data. Most GIS software packages also provide a means to calculate these values. It is important to test any columns containing PERIMETER, AREA or LENGTH values before using them for analysis purposes. These important values can be carried from format to format and become out-dated. Verify that the values are correct. Also, in your GIS software, please view the properties of data layers for the map units used to calculate these fields, and for the units set for display purposes.
Entity and Attribute Overview
The Terrain data package is made up of several data themes containing primarily spatial information. These data supplement the Elevation datasets by providing additional information to aid flood risk evaluation and flood hazard area delineations
Entity and Attribute Detail Citation
The ArcView shapefile and ArcGIS geodatabase formats, commonly used for Maine GIS data, carry default identifiers and attributes that are software generated and/or important for internal recordkeeping. These are listed here to avoid repetition for every layer, and may not be repeated in the attribute descriptions and definitions of each layer. Common software generated identifiers and attributes in Maine GIS data include: FID (feature identifier), Shape (feature geometry), OBJECTID and SHAPE_lengt. In addition, most GIS formats will carry fields for PERIMETER, AREA and/or LENGTH according to feature geometry. These fields are typically available by default, with the units based on coordinate system or projection units of GIS data. Most GIS software packages also provide a means to calculate these values. It is important to test any columns containing PERIMETER, AREA or LENGTH values before using them for analysis purposes. These important values can be carried from format to format and become out-dated. Verify that the values are correct. Also, in your GIS software, please view the properties of data layers for the map units used to calculate these fields, and for the units set for display purposes.
Contact Organization
(MEGIS) Maine Office of Geographic Information Systems
Contact Person
GIS Coordinator
Contact Position
GIS Coordinator
Address Type
mailing address
Address
State House Station 174
City
Augusta
State or Province
ME
Postal Code
04333-0174
Country
USA
Contact Voice Telephone
207 624-7700
Contact Facsimile Telephone
207 287-3842
Hours of Service
Monday through Friday 0800 - 1700 EST
Resource Description
http://megis.maine.gov/catalog/
Distribution Liability
Users must assume responsibility to determine the usability of this data for their purposes. Although these data have been processed successfully on a computer system at the Maine Office of Geographic Information Systems, no warranty expressed or implied is made by MEGIS regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Neither the Maine Office of Geographic Information Systems, nor any of its contributors, is liable for misuse of the data, for damage, for transmission of viruses, or for computer contamination through the distribution of these data sets.
Format Name
ESRI Shapefile
Format Version Number
ARC Version 9.x
Format Specification
ArcView Shapefile Format
Format Information Content
MEGIS has made all vector layers, in the Maine GIS Internet Data Catalog, available in ESRI's ArcView shapefile format. A shapefile is a simple non-topological format that stores the geometry and attribute information for a set of geographic features as a set of vector (point, line, polygon) coordinates. Shapefiles draw quickly and directly in ArcView, ArcGIS, ArcExplorer. Shapefiles are a compatible data type for many other types of GIS software. Three files are fundamental to each shapefile: .shp stores the feature geometry (shape and location information); .shx stores the index of the feature geometry; .dbf a dBASE (TM) file stores the attribute information for the features. Other index files may be created to help speed analysis and query: these file formats are .sbn .sbx .ain .aix .fbn and .fbx. In addition you may find projection .prj, and metadata .xml, files associated with shapefiles.
File Decompression Technique
Data available from this website is in .zip compressed format. WinZip is a Windows based, PKZip-compatible compression utility. You will need a program like this to extract the data.
[accinstr]
These data are available to Internet browsers for download from the Maine GIS Internet Data Catalog - http://megis.maine.gov/catalog/Data available from this website is in .zip compressed format. WinZip is a Windows based, PKZip-compatible compression utility. You will need a program like this to extract the data.If you are not already a GIS user, free software for viewing these files is available from Environmental Systems Research Institute, Inc. (ESRI) - www.esri.com
Fees
Data may be downloaded from Maine GIS Internet Data Catalog at no charge.
Turnaround
Data is available for immediate download from the Maine GIS Internet Data Catalog.
Technical Prerequisites
If you are not already a GIS user, free software for viewing these files is available from Environmental Systems Research Institute, Inc. (ESRI) http://www.esri.com/
Contact Organization
Maine Office of Geographic Information Systems
Contact Position
GIS Coordinator
Address Type
mailing address
Address
State House Station 174
City
Augusta
State or Province
ME
Postal Code
04333-0174
Country
USA
Contact Voice Telephone
(207) 624-7700
Contact Facsimile Telephone
(207) 287-3842
Hours of Service
Monday through Friday 0800 - 1700 EST
Distribution Liability
Users must assume responsibility to determine the usability of this data for their purposes.
Format Name
ARCSDE
Format Version Number
ArcSDE 9.x
Format Information Content
Oracle 9i
[accinstr]
Please contact the Maine Office of GIS (MEGIS) for access instructions.
[smdistty]
1
Fees
Access is available through Maine's wide area network; WAN users may contact the Maine Office of Information Technology, Maine Office of Geographic Information Systems (MEGIS) for a login.
Metadata Reference Information
Metadata Date
20090209
Metadata Review Date
20100114
Metadata Future Review Date
20100209
Metadata Contact
Contact Organization
(MEGIS) Maine Office of Geographic Information Systems
Contact Person
GIS Coordinator
Contact Position
GIS Coordinator
Address Type
mailing address
Address
State House Station 174
City
Augusta
State or Province
ME
Postal Code
04333-0174
Country
USA
Contact Voice Telephone
207 624-7700
Contact Facsimile Telephone
207 287-3842
Hours of Service
Monday through Friday 0800 - 1700 EST
Metadata Standard Name
FGDC Content Standards for Digital Geospatial Metadata
Metadata Standard Version
FGDC-STD-001-1998
Metadata Access Constraints
None
Metadata Use Constraints
None
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