20-arc-minute images of modern topography

Metadata:

Identification_Information:
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1992
Currentness_Reference: publication date of source data
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The image given condenses the original, 16-bit data into classes defined below (see Attribute_Definition). This tends to alter any errors in the original depth values, generally making the errors less visible.
Logical_Consistency_Report:
Please refer to documentation of the source data, ETOPO5 and TBASE. Because the 20-minute gridded data subsume more spatial variability in elevation and bathymetry, these data better represent true topography.
Completeness_Report: Please refer to documentation of the source data, ETOPO5 and TBASE.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Please refer to documentation of the source data, ETOPO5 and TBASE. Because the 20-minute gridded data are arranged on a coarser grid than the original 5-minute data, and the registration error and bias in the original data are smoothed somewhat at this coarser scale, fidelity with ground conditions is improved.
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Pixel
Row_Count: 540
Column_Count: 1080
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 20
Longitude_Resolution: 20
Geographic_Coordinate_Units: Decimal minutes
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Pixel
Entity_Type_Definition: Pixel in the image
Entity_Type_Definition_Source: self-evident
Attribute:
Attribute_Label: Pixel value
Attribute_Definition:
Pixel values are obtained through a look-up table that relates the original source data, 2-byte integers representing elevation or bathymetry in meters above or below sea-level, to color. The mapping is made using the following algorithm. 
if depth < -5000 then color = 0x00,0x00,0x00
if depth < -4000 then color = 0x00,0x00,0x10
if depth < -3000 then color = 0x00,0x00,0x20
if depth < -2000 then color = 0x00,0x00,0x30
if depth < -1000 then color = 0x00,0x00,0x40
if depth <  -900 then color = 0x00,0x00,0x50
if depth <  -800 then color = 0x00,0x00,0x60
if depth <  -700 then color = 0x00,0x00,0x70
if depth <  -600 then color = 0x00,0x00,0x80
if depth <  -500 then color = 0x00,0x00,0x90
if depth <  -400 then color = 0x00,0x00,0xa0
if depth <  -300 then color = 0x00,0x00,0xb0
if depth <  -200 then color = 0x00,0x00,0xc0
if depth <  -190 then color = 0x00,0x00,0xd0
if depth <  -180 then color = 0x00,0x00,0xe0
if depth <  -170 then color = 0x00,0x00,0xf0
if depth <  -160 then color = 0x00,0x00,0xff
if depth <  -150 then color = 0x00,0x10,0xff
if depth <  -140 then color = 0x00,0x20,0xff
if depth <  -130 then color = 0x00,0x30,0xff
if depth <  -120 then color = 0x00,0x40,0xff
if depth <  -110 then color = 0x00,0x50,0xff
if depth <  -100 then color = 0x00,0x60,0xff
if depth <   -90 then color = 0x00,0x70,0xff
if depth <   -80 then color = 0x00,0x80,0xff
if depth <   -70 then color = 0x00,0x90,0xff
if depth <   -60 then color = 0x00,0xa0,0xff
if depth <   -50 then color = 0x00,0xb0,0xff
if depth <   -40 then color = 0x00,0xc0,0xff
if depth <   -30 then color = 0x00,0xd0,0xff
if depth <   -20 then color = 0x00,0xe0,0xff
if depth <   -10 then color = 0x00,0xf0,0xff
if depth <     0 then color = 0x00,0xff,0xff
if depth <    10 then color = 0x00,0xff,0x00
if depth <    20 then color = 0x10,0xff,0x00
if depth <    30 then color = 0x20,0xff,0x00
if depth <    40 then color = 0x30,0xff,0x00
if depth <    50 then color = 0x40,0xff,0x00
if depth <    60 then color = 0x50,0xff,0x00
if depth <    70 then color = 0x60,0xff,0x00
if depth <    80 then color = 0x70,0xff,0x00
if depth <    90 then color = 0x80,0xff,0x00
if depth <   100 then color = 0x90,0xff,0x00
if depth <   110 then color = 0xa0,0xff,0x00
if depth <   120 then color = 0xb0,0xff,0x00
if depth <   130 then color = 0xc0,0xff,0x00
if depth <   140 then color = 0xd0,0xff,0x00
if depth <   150 then color = 0xe0,0xff,0x00
if depth <   160 then color = 0xf0,0xff,0x00
if depth <   170 then color = 0xff,0xff,0x00
if depth <   180 then color = 0xff,0xf0,0x00
if depth <   190 then color = 0xff,0xe0,0x00
if depth <   200 then color = 0xff,0xd0,0x00
if depth <   300 then color = 0xff,0xc0,0x00
if depth <   400 then color = 0xff,0xb0,0x00
if depth <   500 then color = 0xff,0xa0,0x00
if depth <   600 then color = 0xff,0x90,0x00
if depth <   700 then color = 0xff,0x80,0x00
if depth <   800 then color = 0xff,0x70,0x00
if depth <   900 then color = 0xff,0x60,0x00
if depth <  1000 then color = 0xff,0x50,0x00
if depth <  2000 then color = 0xff,0x40,0x00
if depth <  3000 then color = 0xff,0x30,0x00
if depth <  4000 then color = 0xff,0x20,0x00
if depth <  5000 then color = 0xff,0x10,0x00
if depth <  6000 then color = 0xff,0x00,0x00
if depth < 32767 then color = 0xff,0x00,0x00
Attribute_Definition_Source: <URL:http://geochange.er.usgs.gov/pub/data/sea_level/Core/raw/src/color_topo.c>
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 127
Attribute_Units_of_Measure: None; the values are indices into a color look-up table.
Distribution_Information:
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: GIF
Transfer_Size: 0.15
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <URL:http://geochange.er.usgs.gov/pub/data/sea_level/Core/raw/present/images/mod20e.gif>
Network_Resource_Name: <URL:http://geochange.er.usgs.gov/pub/data/sea_level/Core/raw/present/images/mod20t.gif>
Digital_Form:
Digital_Transfer_Information:
Format_Name: PICT
Transfer_Size: 0.25
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <URL:http://geochange.er.usgs.gov/pub/data/sea_level/Core/raw/present/images/mod20e.pict>
Network_Resource_Name: <URL:http://geochange.er.usgs.gov/pub/data/sea_level/Core/raw/present/images/mod20t.pict>
Metadata_Reference_Information:
Record_Identifier_Type: URL
Record_Combine_Method: Replace
Parent_Record: <URL:http://geochange.er.usgs.gov/pub/data/sea_level/Contents/FGDCmeta>
Generated by mp on Mon Oct 28 09:52:17 1996