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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 Terrain Aspect
- Geospatial_Data_Presentation_Form: raster digital data
- Description:
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- Abstract:
- This data set contains the terrain aspect for the Eastern Intensive Study Area (ISA) of the CPC Ecuador Projects, in the northern Oriente of Ecuador. Aspect is the downslope direction of the maximum rate of change on a hillside. It is derived from a digital elevation model (DEM). Each pixel is attributed with a value that represents the compass direction, in degrees clockwise from 0 at north, in which the hillside faces. The raster resolution of the data set is based on the resolution of the source DEM – in this case, 30 meters.
- Purpose:
- The aspect data can be used for any analyses that require a directional terrain 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: terrain
- Theme_Keyword: aspect
- Theme_Keyword: hillside
- Theme_Keyword: direction
- 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 aspect data 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 Digital Elevation Model
- Cross_Reference:
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- Citation_Information:
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- Title: East ISA Terrain Slope
- Cross_Reference:
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- Citation_Information:
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- Title: North ISA Terrain Aspect
- Cross_Reference:
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- Citation_Information:
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- Title: South ISA Terrain Aspect
- Data_Quality_Information:
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- Attribute_Accuracy:
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- Attribute_Accuracy_Report:
- The directional aspect values assigned to the pixels in the data set were generated with the ASPECT algorithm in ARC/INFO, which calculates the direction of greatest elevational change based on surrounding pixels. Aspect values are derived solely from the DEM data. An accuracy assessment of the aspect 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 Digital Elevation Model was used to generate the aspect surface. The ASPECT command in ARC/INFO was used. For each pixel, ASPECT calculates the direction of the greatest rate of elevational change in the surrounding pixels and assigns that value to the pixel.
- 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 aspect direction, in degrees. The directions range from 0 to 359, increasing in a clockwise direction from north, which has the value of 0.
- 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: 4.525
- 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