Data Resolution


Definition

The <Data_Resolution> field specifies the resolution of the data, which is the difference between two adjacent geographic, vertical, or temporal values. Controlled keywords representing horizontal, vertical and temporal data resolution ranges can be selected. Selection of data resolution ranges will assist users in refining their search for data within specific resolution ranges.


  • <Latitude_Resolution> is the minimum difference between two adjacent latitude values.
  • <Longitude_Resolution> is the minimum difference between two adjacent longitude values.
  • <Horizontal_Resolution_Range> is a controlled list of  latitude/longitude resolution ranges.  The range should be selected based on the <Latitude_Resolution> and <Longitude_Resolution>.
  • <Vertical_Resolution> is the minimum difference possible between two adjacent vertical values.
  • <Vertical_Resolution_Range> is a controlled list of vertical resolution ranges. The range should be selected based on the specified <Vertical_Resolution>.
  • <Temporal_Resolution> is the frequency of data sampled. For example, <Temporal_Resolution> Daily </Temporal_Resolution>.
  • <Temporal_Resolution_Range> is a controlled list of temporal resolution ranges. The range should be selected based on the specified <Temporal_Resolution>.
 
Syntax

<Data_Resolution>
    <Latitude_Resolution>Text, including units</Latitude_Resolution>
    <Longitude_Resolution>Text, including units</Longitude_Resolution>
    <Horizontal_Resolution_Range>controlled horizontal resolution range keyword </Horizontal_Resolution_Range>
    <Vertical_Resolution>Text, including units</Vertical_Resolution>
    <Vertical_Resolution_Range>controlled vertical resolution range     keyword</Vertical_Resolution_Range
    <Temporal_Resolution>Text, including units</Temporal_Resolution>
    <Temporal_Resolution_Range>controlled temporal resolution range keyword </Temporal_Resolution_Range>
</Data_Resolution>


  • All fields may contain 1 to 80 characters of the UTF-8 character set.
 
Usage
  • The <Data_Resolution> field is highly recommended.
  • The <Data_Resolution> field may be repeated.
  • The <Data_Resolution> subfields are optional and may not be repeated within <Data_Resolution>.
  • The author may enter precise horizontal and vertical spatial resolutions, as well as temporal resolutions.
  • The <Horizontal_Resolution_Range>, <Vertical_Resolution_Range> and the <Temporal_Resolution_Range> keywords should be selected from the set of data resolution keywords.
  • Units must be specified in the <Data_Resolution> text fields. Some suggested units are: m (meters), km (kilometers), degree, hourly, daily, weekly, and monthly.
 

Example

<Data_Resolution>
    <Latitude_Resolution>10 km</Latitude_Resolution>
    <Longitude_Resolution>10 km</Longitude_Resolution>
    <Horizontal_Resolution_Range>10 km - < 50 km or approximately .09 degree - < .5 degree</Horizontal_Resolution_Range>
     <Vertical_Resolution> 100 m </Vertical_Resolution>
     <Vertical_Resolution_Range>30 m -< 100 m</Vertical_Resolution_Range>
    <Temporal_Resolution>Two day repeat observations with a repeat orbit pattern every 16 days.</Temporal_Resolution>
    <Temporal_Resolution_Range>Daily -<Weekly</Temporal_Resolution_Range>
  </Data_Resolution>

 

This document should be cited as:
Directory Interchange Format (DIF) Writer's Guide, 2015.
Global Change Master Directory.
National Aeronautics and Space Administration.
[http://gcmd.nasa.gov/add/difguide/].

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