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- 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: East ISA Digital Elevation Model
- Geospatial_Data_Presentation_Form: raster digital data
- Description:
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- Abstract:
- This digital elevation model (DEM) contains hydrologically-correct terrain elevation data in a digital raster format for the Eastern 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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- 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: -76.752607
- East_Bounding_Coordinate: -76.501410
- North_Bounding_Coordinate: -0.002758
- South_Bounding_Coordinate: -0.337303
- 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:
- 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:
- 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:
- 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: East ISA Elevation Contours
- Cross_Reference:
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- Citation_Information:
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- Title: East 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: South ISA Digital Elevation Model
- Cross_Reference:
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- Citation_Information:
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- Title: East ISA Terrain Aspect
- Cross_Reference:
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- Citation_Information:
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- Title: East 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 East ISA Elevation Contour data and the East 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. An East 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: 1233
- Column_Count: 932
- 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:
- 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: 4.411
- 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:
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- 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