Geographic Resources Center
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Metadata for cnnndem
Table of Contents
Identification_Information
Abstract
Purpose
Supplemental Information
Data_Quality_Information
Spatial_Data_Organization_Information
Entity_and_Attribute_Information
Detailed Description
Overview
Distribution_Information
Metadata_Reference_Section
Identification_Information
Citation_Information
Originator: Geographic Resources Center
Publication_Date: 1997
Title: County-Level DEM
Scale_Denominator: 250000
Description
Abstract
50 meter resolution Digital Elevation Model of Missouri counties.
Purpose
Generally used in surface modeling, surface viewing, and surface analysis.
Supplemental_Information
Procedures_Used
These datasets were created by joining the thirty separate USGS
3 arc-second dem datasets that encompass the area of Missouri. The
original datasets had various levels of resolution according to their
latitudinal positioning. All were resampled to the 50 meter resolution
now present and then merged. Most anomalous data points were eliminated
by using a low-pass filter in ARC. The merged set was then clipped by
a 6 kilometer buffered state polygon. All counties were buffered by
1 kilometer and then used to clip out the county-level sets now available.
Some anomalous points may still be present along join-lines of the
separate dems. These should be easily detected and eliminated by the
use of a variety of GIS applications available.
The join-lines can be considered the same as those of the 1:100,000
quadrangles of Missouri. Thus, the user can be advised to inspect their
county-level dem along these lines (if applicable).
Although this dataset may be used for some hydrological analysis, the user
should be aware that these data may not be applicable for smaller-streams.
James D. Harlan
Aug 6, 1997i
Revisions
n/a
Reviews_Applied
Reviewed by James D. Harlan, 7 August 1997.
Related_Spatial_and_Tabular_Data_Sets
A state-level DEM is available at MSDIS and could possibly be provided
upon special request. However, the size of the dataset approaches 1gig
and is not appropriate for dissemination on a wide basis through the
internet.
The USGS has a variety of DEMs available on various web sites.
Other_References_Cited
United States Geological Survey.
Defense Mapping Agency
Notes
This DEM could be referred to as 3 arc-second, 1:250,000, or
1degree x 1degree. It was originally created by the Defense Mapping Agency
(DMA) and adapted by the USGS to fit as a DEM for their 250,000 (1deg x 1deg)
quadrangles.
Many sources were implemented in determining the elevation values for the
dem mesh points with USGS and DMA 24,000 and 25,000 quadrangles being the
most often cited. So, the scale of 250,000 is deceiving. The dem is only
fitted to the 250,000 quad size or area.
Time_Period_of_Content
Single_Date/Time
Calendar_Date: 1997
Currentness_Reference
1996 data.
Status
Progress: Data complete
Maintenance_and_Update_Frequency
Still under analysis and will be modified or updated accordingly.
Spatial_Domain
Bounding_Coordinates
West_Bounding_Coordinate: -92.8681752
East_Bounding_Coordinate: -92.33054014
North_Bounding_Coordinate: 40.35708672
South_Bounding_Coordinate: 40.02640052
Keywords
Theme
Theme_Keyword_Thesaurus: None
Theme_Keyword: County-Level DEM
Place
Place_Keyword_Thesaurus: None
Place_Keyword: Counties of the State of Missouri
Stratum
Stratum_Keyword_Thesaurus: None
Stratum_Keyword:
Temporal
Temporal_Keyword_Thesaurus: None
Temporal_Keyword:
Access_Constraints
n/a
Use_Constraints
Limitations are generally user-defined and will vary according
to project needs or standards..
Point_of_Contact: See Data_Set_Credit
Missouri Spatial Data Information Service, Department of Geography,
University of Missouri - Columbia.
Security_Information
Security_Classification_System: None
Security_Classification: UNCLASSIFIED
Security_Handling_Description: None
Native_Data_Set_Environment: AIX UNIX, ARC/INFO version 7.0.4
Cross_Reference
Originator: United States Geological Survey and Defense Mapping Agency
Publication_Date: 1996
Publication_Time:
Title: 3-Arc Second Digital Elevation Models
Edition:
Geospatial_Data_Presentation_Form:
Series_Information
Series_Name:
Issue_Identification:
Publication_Information
Publication_Place:
Publisher:
Other_Citation_Details:
Online_Linkage:
Larger_Work_Citation:
Data_Quality_Information
Attribute_Accuracy
Attribute_Accuracy_Report: See Logical_Consistency_Report: Not applicable for raster data.
Completeness_Report
Data complete.
Positional_Accuracy
Horizontal_Positional_Accuracy
Horizontal_Positional_Accuracy_Report:
130 meters.
Quantitative_Horizontal_Positional_Accuracy_Assessment:
Horizontal_Positional_Accuracy_Value: 50 meters
Horizontal_Positional_Accuracy_Explanation: Resolution as reported
Vertical_Positional_Accuracy
Vertical_Positional_Accuracy_Report:
30 meters
Lineage: See Cloud_Cover
n/a
Spatial_Data_Organization_Information
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 730
Column_Count: 912
Spatial_Reference_Information
Horizontal_Coordinate_System_Definition
Planar
Grid_Coordinate_System
Grid_Coordinate_System_Name: Universal_Transverse_Mercator (UTM)
Zone_Number: 15
Planar_Distance_Units: METERS
Geodetic Model
Horizontal_Datum_Name: WGS84
Ellipsoid_Name: WGS84
Entity_and_Attribute_Information
Detailed_Description
Entity_Type
Entity_Type_Label:
Entity_Type_Definition:
Entity_Type_Definition_Source:
Attribute:
Attribute_Label:
Attribute_Definition:
Attribute_Definition_Source:
Attribute_Domain_Values
Enumerated_Domain
Enumerated_Domain_Value:
Enumerated_Domain_Value_Definition
Enumerated_Domain_Value_Definition_Source:
Overview_Description
Entity_and_Attribute_Overview
No outstanding attributes other than elevation values.
Entity_and_Attribute_Detail_Citation: Not Available
Distribution_Information
Metadata_Reference_Section
Metadata_Date: 19970808
Metadata_Contact: jharlan
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: 19940608
Metadata_Time_Convention: Local Time
Metadata_Security_Information:
Metadata_Security_Classification_System: None
Metadata_Security_Classification: UNCLASSIFIED
Metadata_Security_Handling_Description: None
Last modified: 97-08-08.07:51:12.Fri