North ISA Terrain Slope

Identification_Information:
Citation:
Citation_Information:
Originator: Spatial Analysis Unit, Carolina Population Center
Publication_Date: 2000
Title: North ISA Terrain Slope
Geospatial_Data_Presentation_Form: raster digital data
Description:
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:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1993
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -76.752607
East_Bounding_Coordinate: -76.501410
North_Bounding_Coordinate: -0.002758
South_Bounding_Coordinate: -0.337303
Keywords:
Theme:
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:
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
Data_Set_Credit:
The slope data was generated by Brian Frizzelle, of the Spatial Analysis Unit, Carolina Population Center.
Security_Information:
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:
Citation_Information:
Title: North ISA Digital Elevation Model
Cross_Reference:
Citation_Information:
Title: North ISA Terrain Aspect
Cross_Reference:
Citation_Information:
Title: East ISA Terrain Slope
Cross_Reference:
Citation_Information:
Title: South ISA Terrain Slope


Data_Quality_Information:
Attribute_Accuracy:
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:
Process_Step:
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:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 1232
Column_Count: 931
Vertical_Count: 1


Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Grid_Coordinate_System:
Grid_Coordinate_System_Name: Universal Transverse Mercator
Universal_Transverse_Mercator:
UTM_Zone_Number: 18
Transverse_Mercator:
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:
Planar_Coordinate_Encoding_Method: row and column
Coordinate_Representation:
Abscissa_Resolution: 30.000000
Ordinate_Resolution: 30.000000
Planar_Distance_Units: meters
Geodetic_Model:
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:
Overview_Description:
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:
Distributor:
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
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
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:
Metadata_Date: 20021004
Metadata_Contact:
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:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile