Open-File Report 2012-1259

SP_Crater.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_Crater_Geog
Alternate Titles: 	South Pole Crater
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    -179.999924
* East Longitude    179.999924
* North Latitude    -64.771375
* South Latitude    -80.314777
* 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_Crater_Geog
Content Type:    Downloadable Data

ESRI Spatial Information 
Extent In The Item's Coordinate Reference
Bounding Rectangle:
* West Longitude    -179.999924
* East Longitude    179.999924
* North Latitude    -64.771375
* South Latitude    -80.314777
* 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_Crater_Geog
* Feature Type:    Simple
* Geometry Type:    Polyline 
* Has Topology:    False
* Feature Count:    348
* Spatial Index:    True
* Linear Referencing:    False

ESRI Fields and Subtypes 
SP_Crater_Geog Feature Class
* ROW COUNT    348
          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    Longitude
ALIAS    Crater_Longitude_East
* DATA TYPE    Double
* WIDTH    8
FIELD DESCRIPTION
Position of the centroid of the crater in decimal degrees east longitude.
FIELD    Latitude
ALIAS    Crater_Latitude_Aerocentric
* DATA TYPE    Double
* WIDTH    8
FIELD DESCRIPTION
Position of the centroid of the crater in decimal degrees latitude (aerocentric).

FIELD    CBarlowID
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    MC
ALIAS    Mars_5M_Chart
* DATA TYPE    SmallInteger
* WIDTH    2
FIELD DESCRIPTION
Mars Chart (1:5 million) number for quadrangle in which dune field is located.
FIELD    area_km_si
ALIAS    Crater_Area_km2_sinu
* DATA TYPE    Double
* WIDTH    8
FIELD DESCRIPTION
Crater area, in km2, is given when a dune field is located within a crater. When a dune field is located within a crater that is within one or more other craters, the innermost crater is considered to exert the most influence, so its area is used. Areas were calculated in the sinusoidal projection and are based on our digitized craters. 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    Cr_diam
ALIAS    Crater_Diameter_km
* DATA TYPE    Double
* WIDTH    8
FIELD DESCRIPTION
Crater diameter, in km, is given when a dune field is located within a crater. Diameter is calculated by formula based on the area of the crater. 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    Shape_Length
* ALIAS    Shape_Length
* DATA TYPE    Double
* WIDTH    8
* FIELD DESCRIPTION
Length of feature in internal units.
* DESCRIPTION SOURCE
ESRI
* DESCRIPTION OF VALUES    Positive real numbers that are automatically generated.
FIELD    Shape_Area
* ALIAS    Shape_Area
* DATA TYPE    Double
* WIDTH    8
FIELD DESCRIPTION
Area of feature in internal units squared. Do not use this field because it is probably not accurate. Use the Crater_Area_km2_sinu field for accurate area values.
* DESCRIPTION SOURCE
ESRI
* DESCRIPTION OF VALUES    Positive real numbers that are automatically generated.

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