Open-File Report 2012-1259 SP_CcDcAzimuth_Point.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_CcDcAzimuth_Point_Geog Alternate Titles: South Pole CcDcAzimuth Point 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 -179.809921 * East Longitude 179.523680 * North Latitude -65.061241 * South Latitude -80.186291 * 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_CcDcAzimuth_Points_Geog Content Type: Downloadable Data ESRI Spatial Information Extent In The Item's Coordinate Reference Bounding Rectangle: * West Longitude -179.809921 * East Longitude 179.523680 * North Latitude -65.061241 * South Latitude -80.186291 * 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_CcDcAzimuth_Points_Geog * Feature Type: Simple * Geometry Type: Point * Has Topology: False * Feature Count: 288 * Spatial Index: True * Linear Referencing: False ESRI Fields and Subtypes SP_CcDcAzimuth_Point_Geog Feature Class * ROW COUNT 288 DEFINITION (shape - point) Points that represent the azimuth found by extending a polyline from crater centroid to the centroid of a dune field within the crater on Mars between lat 65 degrees and 90 degrees S. (~300 records) It is represented as a point so that it can be plotted from the dune centroid for ease of comparison to the Average Slipface Azimuth. Note that the CdDcAzimuth file is also included as a polyline shapefile. In the ArcMap and ArcReader projects this layer will not render when zoomed out beyond 1:20,000,000. Also 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 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 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. The Dune Field ID is listed with every associated image. FIELD Dune_Lon ALIAS Dune_Longitude_East * DATA TYPE Double * WIDTH 8 FIELD DESCRIPTION Records the position of the centroid of the dune field in decimal degrees east longitude. FIELD Dune_Lat ALIAS Dune_Latitude_Aerocentric * DATA TYPE Double * WIDTH 8 FIELD DESCRIPTION This field records the position of the centroid of the dune field in decimal degrees latitude (aerocentric) of the centroid. FIELD CcDcAzGeog 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 system (for compatibility with the EQ and NP parts of MGD3). 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 SF_Az_Geog ALIAS Slipface_1_Azimuth_Geographic * DATA TYPE Double * WIDTH 8 FIELD DESCRIPTION The azimuth, given in decimal degrees, is the average of individual slipface measurements. In selected areas, where THEMIS VIS, MOC NA, or CTX images of sufficient quality were available, polylines were drawn on slipfaces to measure the direction of wind movement at the time the gross dune morphology formed. The scope of this project did not allow for deciphering detailed slipface morphology or for measuring all slipfaces. We attempted to include enough slipface measurements to represent the general circulation (as implied by gross dune morphology) and to give a sense of the complex nature of aeolian activity on Mars. The absence of slipface measurements in a given direction should not be taken as evidence that winds in that direction did not occur. When more than one direction was recorded, slipface measurements were grouped and an average for each direction was calculated. Slipface1 is the direction with the greatest number of slipfaces used in the averaging process. Images were projected to ArcMap in the South Polar Stereographic projection using the Mars_2000 datum. Slipface azimuth was calculated in decimal degrees in the Geographic coordinate system (for compatibility with the Equatorial and North Polar parts of MGD3). FIELD CcDcAzMerc 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. 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 SF_Az_Merc ALIAS Slipface_1_Azimuth_Mercator * DATA TYPE Double * WIDTH 8 FIELD DESCRIPTION The azimuth, given in decimal degrees, is the average of individual slipface measurements. In selected areas, where THEMIS VIS, MOC NA, or CTX images of sufficient quality were available, polylines were drawn on slipfaces to measure the direction of wind movement at the time the gross dune morphology formed. The scope of this project did not allow for deciphering detailed slipface morphology or for measuring all slipfaces. We attempted to include enough slipface measurements to represent the general circulation (as implied by gross dune morphology) and to give a sense of the complex nature of aeolian activity on Mars. The absence of slipface measurements in a given direction should not be taken as evidence that winds in that direction did not occur. When more than one direction was recorded, slipface measurements were grouped and an average for each direction was calculated. Slipface1 is the direction with the greatest number of slipfaces used in the averaging process. Images were projected to ArcMap in the South Polar Stereographic projection using the Mars_2000 datum. Slipface azimuth was calculated in decimal degrees in the Mercator projection for comparison with the CcDcAzimuth in the Mercator projection. We recommend that numerical comparisons be made in the Mercator projection because the Mercator projection preserves direction. FIELD CcDcAzSter ALIAS CcDcAzimuth_Stereographic * DATA TYPE Double * WIDTH 8 FIELD DESCRIPTION The azimuth of the line connecting the crater centroid to dune centroid, calculated in decimal degrees in the South Polar Stereographic projection. This value is provided so that the user can correctly display the point version of the CcDcAzimuth in South Polar Sterographic projection. We recommend that numerical comparisons be made in the Mercator projection because the Mercator projection preserves direction. FIELD CraterBID 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. FIELD Crater_Lon ALIAS Crater_Longitude_East * DATA TYPE Double * WIDTH 8 FIELD DESCRIPTION Position of the centroid of the crater in decimal degrees east longitude. FIELD Crater_Lat ALIAS Crater_Latitude_Aerocentric * DATA TYPE Double * WIDTH 8 FIELD DESCRIPTION Position of the centroid of the crater in decimal degrees latitude (aerocentric). 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