Open-File Report 2012-1259 SP_Average_Slipface.doc Mars Global Digital Dune Database: MC-30 By R.K. Hayward, L.K. Fenton, T.N. Titus, A. Colaprete, and P.R. Christensen 2012 (http:pubs.usgs.gov/of/2012/1259) Summary See Pamphlet.doc, Mars Global Digital Dune Database Purpose. Description See Pamphlet.doc, Mars Global Digital Dune Database Abstract. Credits There are no credits for this item. Access and use limitations There are no restrictions. ArcGIS Metadata Resource Identification Citation Title: Sp_Average_Slipface_Geog Alternate Titles: South Pole Average Slipface Presentation Format: digital map Collection Title: Mars Global Digital Dune Database Responsible Party: Individual's Name: Rosalyn K. Hayward Organization's Name: USGS, Astrogeology Contact's Position: Geologist Contact's Role : Originator Contact Information: Phone: Voice: (928) 566-7022 Fax: (928) 566-7014 Address: Delivery Point: 2255 N. Gemini Dr. City: Flagstaff Administrative Area: Az Postal Code: 86001 Country: United States E-Mail Address: rhayward@usgs.gov Publication_Information: Publication_Place: Reston, Virginia Publisher: U.S. Geological Survey Online_Linkage: http://pubs.usgs.gov/of/2012/1259 Themes Or Categories Of The Resource : geoscientificInformation Tags For Searching: Dune, Aeolian, Mars, Database, Gcm Discipline Keywords: Planetary Science Place Keywords: Mars Theme Keywords: Dune Theme Keywords: Aeolian Theme Keywords: Database Theme Keywords: GCM Dataset Languages: English (United States) Dataset Character Set Utf8 - 8 Bit Ucs Transfer Format Status: Completed Resource Maintenance: Update Frequency: Not Planned Scope Of The Updates: Dataset Resource Constraints: Constraints: Limitations Of Use: There are no restrictions. Spatial Representation Type: Vector * Processing Environment: Microsoft Windows Server 2008 R2 Version 6.1 (Build 7601) Service Pack 1; Esri Arcgis 10.0.2.3200 Other Extent Information: Geographic Extent: Bounding Rectangle: * Extent Type Extent Used For Searching * West Longitude -179.660300 * East Longitude 178.822300 * North Latitude -65.000300 * South Latitude -80.860800 * Extent Contains The Resource: Yes Point Of Contact: Individual's Name: Rosalyn K. Hayward Organization's Name: USGS, Astrogeology Contact's Position: Geologist Contact's Role: Originator Contact Information: Phone: Voice: (928) 566-7022 Fax: (928) 566-7014 Address: Delivery Point: 2255 N. Gemini Dr. City: Flagstaff Administrative Area: Az Postal Code:86001 Country: United States E-Mail Address: rhayward@usgs.Gov Reference System Reference System Identifier Value 104905 * Codespace Esri * Version 10.0.0 Data Quality Scope Of Quality Information Resource Level: dataset Lineage: Process Step: See Pamphlet.doc, Mars Global Digital Dune Database Process. Data Quality Report - Completeness Omission: See Pamphlet.doc, Mars Global Digital Dune Database - Completeness of Database. Data Quality Report - Conceptual Consistency Measure Description: All attributes were verified by displaying the lines in both the database and the spatial coverage and they are believed to be logically consistent. Data Quality Report - Topological Consistency Measure Description: These data are believed to be logically consistent. Line geometry is topologically clean. Data Quality Report - Absolute External Positional Accuracy: Measure Description: The horizontal accuracy is derived from the accuracy of the Mars Orbiter Laser Altimeter (MOLA) dataset [Smith and others, 2001]. The globally adjusted MOLA dataset has an absolute horizontal accuracy on the order of 100 m, but individual features in images can probably only be tied to MOLA-derived shaded-relief digital image models with a precision on the order of 200 m. Other bases used included Thermal Emission Imaging System (THEMIS) digital images [Archinal and others, 2003, Christensen and others, 2004]. The digital features were drawn at 20K to 100K scale with a node spacing of approximately 0.3 km to 2 km. ESRI Metadata and Item Properties Metadata Properties: Arcgis: Arcgis1.0 Metadata Style: FGDC CSDGM Metadata Metadata Standard Or Profile: FGDC Created In Arcgis: 2012-05-14t13:03:12 Last Modified In Arcgis: 2012-06-03t15:08:05 Automatic Updates: Last Update: 2012-06-03t15:06:39 Have Been Performed: Yes Item Properties Name: Sp_Average_Slipface_Geog Content Type: Downloadable Data ESRI Spatial Information Extent In The Item's Coordinate Reference Bounding Rectangle: * West Longitude -179.660300 * East Longitude 178.822300 * North Latitude -65.000300 * South Latitude -80.860800 * Extent Contains The Resource: Yes Coordinate Reference Type: Geographic Geographic Coordinate Reference: GCS_Mars_2000 Coordinate Reference Details Geographic Coordinate System Well-Known Identifier: 104905 X Origin: -399.99999999999989 Y Origin: -399.99999999999989 XY Scale: 1000000000.0000001 Z Origin: -100000 Z Scale: 10000 M Origin: -100000 M Scale: 10000 XY Tolerance: 1.6870604858115214e-008 Z Tolerance: 0.001 M Tolerance: 0.001 High Precision: True Left Longitude: -180 Well-Known Text GEOGCS["GCS_Mars_2000",DATUM["D_Mars_2000",SPHEROID ["Mars_2000_IAU_IAG",3396190.0,169.8944472236118]],PRIMEM ["Reference_Meridian",0.0],UNIT["Degree",0.0174532925199433],AUTHORITY ["ESRI",104905]] ESRI Feature Class Feature Class Name: Sp_Average_Slipface_Geog * Feature Type: Simple * Geometry Type: Point * Has Topology: False * Feature Count: 209 * Spatial Index: True * Linear Referencing: False ESRI Fields and Subtypes SP_Average_Slipface_Geog Feature Class * ROW COUNT 209 DEFINITION (shape - point) An average slipface azimuth was calculated for dune fields with raw slipface measurements. That average is plotted in the average location of the group of raw slipfaces as an arrow (~200 records). FIELD OBJECTID * ALIAS OBJECTID * DATA TYPE OID * WIDTH 4 * FIELD DESCRIPTION Internal feature number. * DESCRIPTION SOURCE ESRI * DESCRIPTION OF VALUES Sequential unique whole numbers that are automatically generated. FIELD Shape * ALIAS Shape * DATA TYPE Geometry * FIELD DESCRIPTION Feature geometry. * DESCRIPTION SOURCE ESRI * DESCRIPTION OF VALUES Coordinates defining the features. FIELD DuneBID ALIAS Dune_Lon_Lat_ID * DATA TYPE String * WIDTH 20 FIELD DESCRIPTION The ID number of the dune field in which the average slipface point is located. Each dune field has a unique ID number constructed after the method used by Barlow (2003) to assign ID numbers to craters. Longitude is listed first and both values are extended to one decimal place. The + or - sign of the latitude is given, indicating the break between the two values. Thus 122.5 east longitude, - 34.5 south latitude, becomes 1225-345. The longitude is always four digits and the latitude is always three digits, filling in with leading zeroes where necessary. FIELD Avg_SF_Lon ALIAS Average_Longitude_East * DATA TYPE Double * WIDTH 8 FIELD DESCRIPTION Records the position of the point that represents the average slipface, in decimal degrees east longitude. FIELD Avg_SF_Lat ALIAS Average_Latitude_Aerocentric * DATA TYPE Double * WIDTH 8 FIELD DESCRIPTION Records the position of the point that represents the average slipface, in decimal degrees latitude (aerocentric). FIELD SF_ID ALIAS Slipface_ID * DATA TYPE String * WIDTH 20 FIELD DESCRIPTION The Dune_lat_lon_ID with a, b, c or d appended when multiple averages are calculated for a single dune field. This occurs when winds are multidirectional. FIELD SF_Count ALIAS Slipface_Count * DATA TYPE Integer * WIDTH 4 FIELD DESCRIPTION The number of raw slipfaces used to calculate the average slipface. FIELD AvgSF_Geog ALIAS Slipface_Azimuth_Geographic * DATA TYPE Double * WIDTH 8 FIELD DESCRIPTION The average slipface, in decimal degrees, for a given group of raw slipface measurements. It is calculated in the Geographic coordinate system (for compatibility with the EQ and NP parts of MGD3). We recommend that numerical comparisons be made in the Mercator projection because the Mercator projection preserves direction. FIELD AvgSF_Merc ALIAS Slipface_Azimuth_Mercator * DATA TYPE Double * WIDTH 8 FIELD DESCRIPTION The average slipface, in decimal degrees, for a given group of raw slipface measurements. It is calculated in the Mercator projection. This value for the average slipface azimuth can be compared to the crater centroid to dune centroid azimuth because they were both calculated in the Mercator projection. We recommend that numerical comparisons be made in the Mercator projection because the Mercator projection preserves direction. FIELD AvgSF_Ster ALIAS Slipface_Azimuth_Stereographic * DATA TYPE Double * WIDTH 8 FIELD DESCRIPTION The average slipface, in decimal degrees, for a given group of raw slipface measurements, as calculated in the South Polar Stereographic projection. The average azimuth was calculated by (1) displaying the raw slipface lines in Stereographic projection, (2) using ArcMap to calculate the azimuth in the Stereographic projection, and (3) averaging the individual raw slipface azimuths within a given group. The Stereographic azimuth should be used to rotate the arrow when being displayed in the South Polar Stereographic projection. We recommend that numerical comparisons be made in the Mercator projection because the Mercator projection preserves direction. FIELD CcDcAz_Geo ALIAS CcDcAzimuth_Geographic * DATA TYPE Double * WIDTH 8 FIELD DESCRIPTION ArcMap tools were used to create polylines that extend from crater centroid to dune centroid. The azimuth is calculated in decimal degrees in the Geographic coordinate (for compatibility with the EQ and NP parts of MGD3). We recommend that numerical comparisons be made in the Mercator projection because the Mercator projection preserves direction. Note that the term "crater" was used for simplicity, even though a small number of the circular depressions containing dunes may not be impact craters. FIELD CcDcAz_Mer ALIAS CcDcAzimuth_Mercator * DATA TYPE Double * WIDTH 8 FIELD DESCRIPTION ArcMap tools were used to create polylines that extend from crater centroid to dune centroid. The azimuth is calculated in decimal degrees in the Mercator projection and so can be used for comparison to AvgSF_Merc. Note that the term "crater" was used for simplicity, even though a small number of the circular depressions containing dunes may not be impact craters. We recommend that numerical comparisons be made in the Mercator projection because the Mercator projection preserves direction. FIELD CraterID ALIAS Crater_ “BarlowID” * DATA TYPE String * WIDTH 20 FIELD DESCRIPTION A unique ID number constructed after the method used by Barlow (2003) to assign ID numbers to craters. Longitude is listed first and both values are extended to one decimal place. The + or - sign of the latitude is given, indicating the break between the two values. Thus 122.5 east longitude, -34.5 south latitude, becomes 1225-345. The longitude is always four digits and the latitude is always three digits, filling in with leading zeroes where necessary. Note that the term "crater" was used for simplicity, even though a small number of the circular depressions containing dunes may not be impact craters. This information is only provided when the slipface average is associated with dunes in a crater that also has a CcDcAzimuth. Metadata Details Metadata Language: English Metadata Character Set: Utf8 - 8 Bit Ucs Transfer Format Scope Of The Data Described By The Metadata: Dataset * Scope Name: Dataset Metadata Contact: Individual's Name: Rosalyn K. Hayward Organization's Name: USGS,Astrogeology Contact's Position: Geologist Contact's Role: Originator Contact Information: Phone: Voice: (928) 566-7022 Fax: (928) 566-7014 Address: Delivery Point: 2255 N. Gemini Dr. City: Flagstaff Administrative Area: Az Postal Code: 86001 Country: United States E-Mail Address: rhayward@usgs.gov * Last Update: 2012-06-03 Maintenance: Update Frequency: Not Planned Scope Of The Updates: Dataset