Jump to main content.

Land Cover 1986 Metadata

DATASET NAME: NALC86

Identification_Information:
  Citation:
    Citation_Information:
      Originator: IMADES
      Address: Hermosillo, Sonora, Mexico
      Publication_Date:
      Title:
  
  Description: Upper San Pedro Study Area land cover, 1986
    Abstract: Derived from 60-m classified NALC imagery.
    Purpose: San Pedro geodata browser web site

    Supplemental_Information:
      Data_Type: GRID
      Software: Arc/INFO 8.2
      Operating_System: Unix
      Path_Name: \SPDB\Grids\nalc86
      Reviews_Applied_to_Date:	Lockheed Martin internal review
      Related_Spatial_Data_Files: All geodatasets with sp_ prefix
      References_Cited: Skirvin, Susan M., William G. Kepner, 
                        Stuart E. Marsh, Samuel E. Drake, John K. Maingi, 
                        Curtis M. Edmonds, Christopher J. Watts, and David R.
                        Williams. 2003 (in press). Assessing the Accuracy of 
                        Satellite-Derived Land-Cover Classification Using 
                        Historical Aerial Photography, Digital Orthophoto 
                        Quadrangles, and Airborne Video Data. in (R.S. 
                        Lunetta and J.G. Lyon, eds.) Remote Sensing and 
                        GIS Accuracy Assessment.  CRC Press,Boca Raton, FL.
      Notes: Additional information about the NALC project can be found at
             https://www.epa.gov/nerlesd1/land-sci/north-am.htm
      Cloud_Cover: N/A

  Time_Period_of_Content:
    Time_Period_Information:
      Single_Date/Time:
        Calendar_Date:
    Currentness_Reference:
  
  Status: Interim
    Progress:
    Maintenance_and_Update_Frequency: As needed

  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate:  532962
      East_Bounding_Coordinate:  608202
      North_Bounding_Coordinate: 3592644
      South_Bounding_Coordinate: 3426324

  Keywords:
    Theme:
      Theme_Keyword_Thesaurus:
      Theme_Keyword: San Pedro
      Theme_Keyword: land cover map
      Theme_Keyword: watershed
      Theme_Keyword: Landsat

  Access_Constraints:
  Use_Constraints: 

  Data_Provider_Information:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: EPA NERL Las Vegas
        Contact_Person: Bill Kepner
      Contact_Address:
	Address_Type:
	Address: P.O. Box 93478
	City: Las Vegas
	State_or_Province: Nevada
	Postal_Code: 89193-3478
      Contact_Voice_Telephone: 702 798 2193
      Contact_Email_Address: kepner.william@epamail.epa.gov

  Data_Processor_Information:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: IMADES
        Contact_Person: Unknown
      Contact_Address:
	Address_Type:
	Address:
	City: Hermosillo
	State_or_Province: Sonora, Mexico
	Postal_Code:
      Contact_Voice_Telephone:
      Contact_Email_Address:

  Metadata_Reference_Information:
    Metadata_Date: 5/10/2003
    Metadata_Contact:
      Contact_Information:
        Contact_Organization_Primary: Soren Scott
          Contact_Organization: USDA-ARS-SWRC
        Contact_Address:
          Address_Type: mailing
          Address: 2000 E. Allen Rd.
          City: Tucson
          State_or_Province: Arizona
          Postal_Code: 85719-1596
        Contact_Voice_Telephone:
        Contact_Email_Address: sscott@tucson.ars.ag.gov
    Metadata_Standard_Version:


Data_Quality_Information:
  Attribute_Accuracy:		
    Attribute_Accuracy_Report: Skirvin et al., 2003
      Attribute_Accuracy_Value:
      Attribute_Accuracy_Explanation:
  Logical_Consistency_Report: Not presently available
  Completeness_Report: Not presently available
  Positional_Accuracy:
    Horizontal_Positional_Accuracy: Not presently available
    Vertical_Positional_Accuracy: Not presently available
  Lineage:
    Process_Step:
      Process_Description: 1986 NALC 60-meter imagery was classified by 
                           IMADES (Hermosillo, Sonora, Mexico). LMES 
			   clipped the imagery to the SP boundary.
      Process_Date:
      Process_Time:
 
SPATIAL REFERENCE INFORMATION
 
Grid Coordinate System: UTM
Horizontal Datum: NAD83
Zone: 12
Units: METERS
Scale: 60-meter cell base
Cell size (x,y): 60, 60
 
SPATIAL DATA ORGANIZATION INFORMATION
 
Number of Columns: 1254
Number of Rows: 2772
Grid Type: 1
Number of Classes: 10
Minimum Value: 1
Maximum Value: 10


LAND COVER CLASS DESCRIPTIONS FOR THE UPPER SAN PEDRO WATERSHED.
Forest
1		 Vegetative communities comprised principally of trees potentially over 10m in height and typically characterized by closed or multi-layered canopies. Species in this category are evergreen (with the exception ofaspen), largely coniferous (e.g. ponderosa pine), and restricted to the upper elevations of mountains that arise off the desert floor.
Oak Woodland
2		 Vegetative communities dominated (
  • 30% total cover) by evergreen trees (Quercus spp.) with a mean height usually between 6 and 15m. Tree canopy is usually open or interrupted and singularly layered. This cover type often grades into forests at its upper boundary and into semi-arid grassland below.
    • Mesquite Woodland
    3    		 Vegetative communities dominated by leguminous trees (Prosopis spp.) whose crowns cover 15% or more of the ground often resulting in dense thickets (30-75% total cover). Historically maintained maximum development on alluvium of old dissected flood plains; now present without proximity to major watercourses. Winter deciduous and generally found at elevations below 1,200m
    Grassland
    4    		 Vegetative communities dominated by perennial and annual grasses (
  • 35% total cover) with occasional herbaceous species present. Trees and shrubs do not exceed 20% of the total cover. Generally grass height is under 1m and they occur at elevations between 1,100 and 1,700m; sometimes as high as 1,900m. This is a landscape largely dominated by perennial bunch grasses separated by intervening bare ground (45-50% total cover) or low-growing sod grasses and annual grasses with a less-interrupted canopy. Semi-arid grasslands are generally positioned in elevation between evergreen woodland above and desertscrub below.
    • Desertscrub
    5    		 Vegetative communities comprised of short shrubs with sparse foliage (
  • 35% total cover) and small cacti that occur between 700 and 1,500m in elevation. Within the San Pedro river basin this community is often dominated by one of at least three species, i.e. creosotebush, tarbush, and whitethorn acacia. Individual plants are often separated by significant areas of barren ground (40-45% total cover) devoid of perennial vegetation. Many desertscrub species are drought-deciduous.
    • Riparian
    6    		 Vegetative communities adjacent to perennial and intermittent stream reaches. Trees can potentially exceed an overstory height of 10m and are frequently characterized by closed or multi-layered canopies depending on regeneration. Species within the San Pedro basin are largely dominated by two species, i.e. cottonwood and Goodding willow. Riparian species are largely winter deciduous.
    Agriculture
    7    		 Crops actively cultivated (and irrigated). In the San Pedro River basin these are primarily found along the upper terraces of the riparian corridor and are dominated by hay and alfalfa. They are minimally represented in overall extent (less than 3% total cover) within the basin and are irrigated by ground and pivot-sprinkler systems.
    Urban
    8

    (Low and High Density)

    		 This is a land-use dominated by small ejidos (farming villages or communes), retirement homes, or residential neighborhoods (Sierra Vista). Heavy industry is represented by a single open-pit copper mining district near the headwaters of the San Pedro River at Cananea, Sonora (Mexico).
    Water
    9    		 Sparse free-standing water is available in the watershed. This category would be mostly represented by perennial reaches of the San Pedro and Babocomari rivers with some attached pools or repressos (earthen reservoirs), tailings ponds near Cananea, ponds near recreational sites such as parks and golf courses, and sewage treatment ponds east of the city of Sierra Vista, Arizona.

    Barren
    10    		 A cover class represented by large rock outcropping or active and abandoned mines (including tailings) that are largely absent of above-ground vegetation. 
    Error matrix comparing aerial photo interpretation and 1986 land cover
classification, with producer's and user's accuracy by class. Overall
accuracy = 68%. Tau = 0.65. Cohen's Kappa (Khat) = 0.61; 
standard error = 0.029. (Skirvin 2003)
    REFERENCE (Aerial Photo Interpretation Class)
        1 2 3 4 5 6 7 8 10 Grand Total
      1 19 1 0 0 0 0 0 0 0 20
      2 3 35 0 1 0 0 0 0 0 39
    1986 3 0 0 17 3 19 0 1 0 2 42
    Land 4 0 0 12 77 12 0 1 0 2 104
    Cover 5 0 0 8 13 74 0 0 0 0 95
    Classes 6 0 0 0 1 1 19 2 0 0 23
      7 0 0 1 4 3 2 9 1 0 20
      8 0 0 0 5 3 0 0 13 0 21
      10 0 0 3 10 7 0 0 0 0 20
     

    Grand Total

    		 22 36 41 114 119 21 13 14 4 384 
    
        
    

    
  
    
    Land Cover Class
    1986 Map Total
    Photo-interpreter Total
    Number Correct
    Producer's Accuracy (%)
    User's Accuracy (%)
  
    
  
    
    1. Forest
    20
    22
    19
    86
    95
  
    
  
    
    2. Woodland Oak
    39
    36
    35
    97
    90
  
    
  
    
    3. Woodland Mesquite
    42
    41
    17
    42
    41
  
    
  
    
    4. Grassland
    104
    114
    77
    68
    74
  
    
  
    
    5. Desertscrub
    95
    119
    74
    62
    78
  
    
  
    
    6. Riparian Forest
    23
    21
    19
    91
    83
  
    
  
    
    7. Agriculture
    20
    13
    9
    69
    45
  
    
  
    
    8. Urban
    21
    14
    13
    93
    62
  
    
  
    
    10. Barren
    20
    4
    0
    0
    0
  
    
  
    
    
    
    Total
    		
    384
    384
    263
     
     
  
    

    
        
    

ENTITY AND ATTRIBUTE INFORMATION
ATTRIBUTE LISTING FOR: SP_NALC86.VAT
    

    
  
    
    COLUMN
    ITEM NAME
    WIDTH
    OUTPUT
    TYPE
    N.DEC
    
    ALTERNATE NAME
    INDEXED?
  
    
  
    
    1
    VALUE
    4
    10
    B
    -
     
    Indexed
  
    
  
    
    5
    COUNT
    4
    10
    B
    -
     
    -
  
    
  
    
    9
    CLSPCT
    7
    7
    N
    
    
     
    -
  
    

    
        
        
    DOWNLOAD sp_land_cover.avl (NALC86 ArcView Legend)
    
  
	
	
    San Pedro Home 
    
      
    Landscape 
        Ecology | Environmental Sciences 
        | Exposure Research | Research 
        and Development
    
	

     


    


     
	
    Local Navigation
    
	

     


    

 


    Jump to main content.