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Stakeholders

Such as Federal Public Service, Federal Statutory Bodies, State Public Service, State Statutory Bodies, Local Authorities and Private Sector.

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Symbology

Symbology, in the context of Cartographic design, is the use of graphical techniques to represent geographic information on a map. Map symbols for geographic features include Visual variables such as color, size, and shape.

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Soils

Soil data consist of georeferenced digital map data and associated tabular attribute data. The map data describe the spatial distribution of the various soils that cover Earth’s surface. The attribute data describe the proportionate extent of the various soils, as well as the physical and chemical characteristics of those soils. The physical and chemical properties are based on observed and measured values, as well as model-generated values. Also included are model-generated assessments of the suitability or limitations of the soils to various land uses.

Source: OMB Circular A–16: Appendix E (2002)

Category: NSDI Data Themes (NDT)

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Stereographic Projection

[map projection] A stereographic projection is a mapping function that projects an entire sphere on a plane – except at one point: the projection point.

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Stereo Pairs

[remote sensing] Stereo pairs are overlapping photos taken at different positions but of the same area. Parallax is used to interpret height differences within the overlapping area.

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State Plane Coordinates

[coordinate system] State Plane Coordinates is a standardized system in the United States based on Lambert conformal conic and transverse Mercator projections.

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Spherical Coordinates

[coordinate system] Spherical coordinates is a coordinate system based on a sphere defined by two angles of rotation in orthogonal planes. The most common is latitudes and longitudes in a geographic coordinate system.

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Spatial Relationship

[data structure] A spatial relationship links GIS features with a table by a unique identifier all stored in a relational database management system.

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Spaghetti Data Model

[data structure] The spaghetti data model is a simple GIS model where lines may cross without intersecting or topology and usually no attributes are created.

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Skeletonize

 [GIS processing] Skeletonizing is the process of thinning a raster line to a single pixel width, typically for conversion to vector data format.

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Sidelap

[remote sensing] Sidelap (or side overlap) consists of the overlapping edge areas of photographs between adjacent flight lines.

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Shaded Relief

[remote sensing] A shaded relief map displays the brightness and shadows of terrain reflection given a sun angle and direction of sunlight.

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Selection Tool

[GIS processing] The selection tool identifies an object or set of objects based on user-selected criteria and properties, typically with Structured Query Language (SQL).