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Spatial resolution: distance

Name Spatial resolution: distance
Definition Ground Sample Distance (GSD).
Obligation
  • dataset or dataset series: conditional; mandatory for the dataset or dataset series if the resolution distance equivalent can be specified
  • service: conditional; mandatory if there is limitation of spatial resolution for the service
Multiplicity [0..*]
Example 100 (m)

20 (m)
50 (m)
Spatial resolution: distance, is most often specified for gridded (raster) data and products on the basis of gridded (raster) data (such as DOF5). It is Ground Sample Distance (GSD) that is specified for this element, i.e. the distance from one centre of neighbouring spatial ground samples to another. For raster data, this is the ground distance between centres of neighbouring sample pixels expressed in meters. For point data, GSD expresses the degree of point position reliability. If two distances are stated, spatial resolution is the interval limited by those two values. For example, "20, 50" assumes spatial resolution to be the interval of 20 to 50 meters. Decimal values are allowed for this element, but are not recommended, except in special cases. NSDI uses meters for units of length.

Tehnical data
 
INSPIRE equivalent Spatial resolution: distance
Comparison with INSPIRE equivalent
ISO equivalent [61] distance
Comparison with ISO equivalent
XPath identificationInfo[1]/*/spatialResolution/*/distance
Data type a number that expresses the distance with the accompanying unit
Domain Length is the number expressing the value of length and the unit of measure [ISO/TS 19103].
Implementation instructions NSDI uses meters for units of length. If spatial resolution: distance is not documented, spatial resolution: equivalent scale must be documented. Either the spatial resolution: equivalent scale or the spatial resolution: distance is documented. Both elements must not be documented.


Encoding example 1: Spatial resolution - distance
 
<gmd:MD_Metadata…
...
     <gmd:identificationInfo>
...
         <gmd:MD_DataIdentification>
...
             <gmd:spatialResolution>
                 <gmd:MD_Resolution>
                     <gmd:distance>
                         <gco:Distance uom="m">100</gco:Distance>
                     </gmd:distance>
                 </gmd:MD_Resolution>
             </gmd:spatialResolution>
...
         </gmd:MD_DataIdentification>
...
     </gmd:identificationInfo>
...
</gmd:MD_Metadata>

Encoding example 2: Spatial resolution - distance as an interval
 
<gmd:MD_Metadata…
...
     <gmd:identificationInfo>
...
         <gmd:MD_DataIdentification>
...
             <gmd:spatialResolution>
                 <gmd:MD_Resolution>
                     <gmd:distance>
                         <gco:Distance uom="m">20</gco:Distance>
                     </gmd:distance>
                 </gmd:MD_Resolution>
             </gmd:spatialResolution>
             <gmd:spatialResolution>
                 <gmd:MD_Resolution>
                     <gmd:distance>
                         <gco:Distance uom="m">50</gco:Distance>
                     </gmd:distance>
                 </gmd:MD_Resolution>
             </gmd:spatialResolution>
...
         </gmd:MD_DataIdentification>
...
     </gmd:identificationInfo>
...
</gmd:MD_Metadata>