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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: North ISA Terrain Slope
- Geospatial_Data_Presentation_Form: raster digital data
- Description:
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- Abstract:
- This data set contains the terrain slope for the Northern Intensive Study Area (ISA) of the CPC Ecuador Projects, in the northern Oriente of Ecuador. For a raster terrain data set, slope is the rate of maximum change in the elevation values from the surrounding eight pixels, through the pixel of interest. It is derived from a digital elevation model (DEM). Each pixel is attributed with a value that represents the slope, in degrees. The raster resolution of the data set is based on the resolution of the source DEM – in this case, 30 meters.
- Purpose:
- The slope data can be used for any analyses that require a terrain component that represents rate of change.
- 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: slope
- 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 slope 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: North ISA Digital Elevation Model
- 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: East ISA Terrain Slope
- 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 slope values assigned to the pixels in the data set were generated with the SLOPE algorithm in ARC/INFO, which calculates the RATE of greatest elevational change based on the eight surrounding pixels. Slope values are derived solely from the DEM data, as slope is the first derivative of elevation. An accuracy assessment of the slope 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 North ISA Digital Elevation Model was used to generate the slope surface. The SLOPE command in ARC/INFO was used. For each pixel, SLOPE takes the values of the eight surrounding pixels, fits a plane to the 3×3 pixel array, and calculates the rate of maximum elevational change along the slope. That rate value is assigned to the central 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: 1232
- Column_Count: 931
- 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: 0.000000
- 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 slope rate of change in degrees. The range of slope values is 0 to 90, where 0 indicates perfectly flat terrain, and 90 indicates a vertical wall.
- 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: 4.510
- 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