South ISA Digital Elevation Model
Metadata also available as
Metadata:
- Identification_Information:
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- Citation:
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- Citation_Information:
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- Originator: Spatial Analysis Unit, Carolina Population Center
- Publication_Date: 2000
- Title: South ISA Digital Elevation Model
- Geospatial_Data_Presentation_Form: raster digital data
- Description:
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- Abstract:
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This digital elevation model (DEM) contains hydrologically-correct
terrain elevation data in a digital raster format for the Northern
Intensive Study Area (ISA) of the CPC Ecuador Projects, in the northern
Oriente of Ecuador. It consists of a sampled array of elevations
interpolated from elevation contours and a sampled array of elevations
for ground positions at a relatively normally-spaced interval. The
spatial resolution of this DEM is 30 meters, meaning that each raster
pixel represents a 30m by 30m area on the ground, and each pixel has
one elevation value, in meters above sea level.
- Purpose:
- The DEM can be used for any analyses that require an
elevational component, or for simple three-dimensional representation
of the ISA.
- Time_Period_of_Content:
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- Time_Period_Information:
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- Multiple_Dates/Times:
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- Single_Date/Time:
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- Calendar_Date: 1991
- Single_Date/Time:
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- Calendar_Date: 1993
- Currentness_Reference: publication date
- Status:
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- Progress: Complete
- Maintenance_and_Update_Frequency: None planned
- Spatial_Domain:
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- Bounding_Coordinates:
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- West_Bounding_Coordinate: -77.002510
- East_Bounding_Coordinate: -76.751846
- North_Bounding_Coordinate: -0.169768
- South_Bounding_Coordinate: -0.503752
- Keywords:
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- Theme:
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- Theme_Keyword_Thesaurus: Ecuador
- Theme_Keyword: elevation
- Theme_Keyword: digital elevation model
- Theme_Keyword: DEM
- Access_Constraints:
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Data is available to the public, made possible through the NASA LBA program.
- Use_Constraints:
- There are no use constraints. However, potential users should
be aware that the resolution of this data set makes it inappropriate
for any analyses where the scale of analysis is finer than 30 meters.
- Point_of_Contact:
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- Contact_Information:
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- Contact_Person_Primary:
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- Contact_Person: Brian Frizzelle
- Contact_Organization: Carolina Population Center
- Contact_Position: Senior Spatial Analyst
- Contact_Address:
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- Address_Type: mailing and physical address
- Address: 123 W. Franklin St., Suite 205 West
- City: Chapel Hill
- State_or_Province: NC
- Postal_Code: 27516
- Country: USA
- Contact_Voice_Telephone: 919-966-6663
- Contact_Facsimile_Telephone: 919-966-6638
- Contact_Electronic_Mail_Address: brian_frizzelle@unc.edu
- Data_Set_Credit:
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The DEM was generated by Brian Frizzelle, of the Spatial Analysis Unit, Carolina Population Center.
- Security_Information:
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- Security_Classification: Unclassified
- Native_Data_Set_Environment:
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Microsoft Windows NT Version 4.0 (Build 1381) Service Pack 6; ESRI ArcCatalog 8.2.0.700
- Cross_Reference:
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- Citation_Information:
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- Title: South ISA Elevation Contours
- Cross_Reference:
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- Citation_Information:
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- Title: South ISA Point Elevations
- Cross_Reference:
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- Citation_Information:
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- Title: Hydrography of Northern Oriente (1:50,000)
- Cross_Reference:
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- Citation_Information:
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- Title: North ISA Digital Elevation Model
- Cross_Reference:
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- Citation_Information:
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- Title: East ISA Digital Elevation Model
- Cross_Reference:
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- Citation_Information:
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- Title: South ISA Terrain Aspect
- Cross_Reference:
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- Citation_Information:
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- Title: South ISA Terrain Slope
- Data_Quality_Information:
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- Attribute_Accuracy:
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- Attribute_Accuracy_Report:
- The elevation values assigned to the pixels in the data set
were generated through an iterative finite difference interpolation
technique in ARC/INFO. Elevations were interpolated based on nearby
contours and point elevations. An accuracy assessment of the elevation
values has not been performed.
- Completeness_Report: Data are complete for the ISA.
- Lineage:
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- Process_Step:
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- Process_Description:
- The South ISA Elevation Contour data and the South ISA Point
Elevation data were used to generate the DEM in ARC/INFO. The TOPOGRID
command was used. The contour data were the primary basis for the
interpolation, with the point elevations enhancing the quality of the
interpolation. A South ISA subset of the 1:50,000 hydrography data was
also inputted to make the DEM hydrologically correct. A 60-meter margin
was applied to the process to allow TOPOGRID to more accurately
interpolate the pixels on the boundaries of the ISA. A tolerance of 10
was applied to the process to assist in the smoothing of the surface
and the removal of sinks in the drainage enforcement process. This
value was chosen as half of the contour interval.
- Process_Date: 2000
- Spatial_Data_Organization_Information:
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- Direct_Spatial_Reference_Method: Raster
- Raster_Object_Information:
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- Raster_Object_Type: Grid Cell
- Row_Count: 1231
- Column_Count: 930
- Vertical_Count: 1
- Spatial_Reference_Information:
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- Horizontal_Coordinate_System_Definition:
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- Planar:
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- Grid_Coordinate_System:
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- Grid_Coordinate_System_Name: Universal Transverse Mercator
- Universal_Transverse_Mercator:
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- UTM_Zone_Number: -18
- Transverse_Mercator:
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- Scale_Factor_at_Central_Meridian: 0.999600
- Longitude_of_Central_Meridian: -75.000000
- Latitude_of_Projection_Origin: 0.000000
- False_Easting: 500000.000000
- False_Northing: 10000000.000000
- Planar_Coordinate_Information:
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- Planar_Coordinate_Encoding_Method: row and column
- Coordinate_Representation:
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- Abscissa_Resolution: 30.000000
- Ordinate_Resolution: 30.000000
- Planar_Distance_Units: meters
- Geodetic_Model:
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- Horizontal_Datum_Name: D_WGS_1984
- Ellipsoid_Name: WGS_1984
- Semi-major_Axis: 6378137.000000
- Denominator_of_Flattening_Ratio: 298.257224
- Entity_and_Attribute_Information:
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- Overview_Description:
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- Entity_and_Attribute_Overview:
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The pixels are attributed with the elevation, in meters, above mean sea level.
- Distribution_Information:
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- Distributor:
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- Contact_Information:
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- Contact_Person_Primary:
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- Contact_Person: Brian Frizzelle
- Contact_Organization: Carolina Population Center
- Contact_Position: Senior Spatial Analyst
- Contact_Address:
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- Address_Type: mailing and physical address
- Address: 123 W. Franklin St., Suite 205 West
- City: Chapel Hill
- State_or_Province: NC
- Postal_Code: 27516
- Country: USA
- Contact_Voice_Telephone: 919-966-6663
- Contact_Facsimile_Telephone: 919-966-6638
- Contact_Electronic_Mail_Address: brian_frizzelle@unc.edu
- Standard_Order_Process:
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- Digital_Form:
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- Digital_Transfer_Information:
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- Transfer_Size: 4.501
- Ordering_Instructions: Contact Brian Frizzelle to obtain a copy of the data set.
- Custom_Order_Process: Contact Brian Frizzelle to obtain a copy of the data set.
- Technical_Prerequisites: Must have a software package that can read ARC/INFO grids.
- Metadata_Reference_Information:
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- Metadata_Date: 20021004
- Metadata_Contact:
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- Contact_Information:
-
- Contact_Person_Primary:
-
- Contact_Person: Brian Frizzelle
- Contact_Organization: Carolina Population Center
- Contact_Position: Senior Spatial Analyst
- Contact_Address:
-
- Address_Type: mailing and physical address
- Address: 123 W. Franklin St., Suite 205 West
- City: Chapel Hill
- State_or_Province: NC
- Postal_Code: 27516
- Country: USA
- Contact_Voice_Telephone: 919-966-6663
- Contact_Facsimile_Telephone: 919-966-6638
- Contact_Electronic_Mail_Address: brian_frizzelle@unc.edu
- Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
- Metadata_Standard_Version: FGDC-STD-001-1998
- Metadata_Time_Convention: local time
- Metadata_Extensions:
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- Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
- Profile_Name: ESRI Metadata Profile
