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  2. List of GIS data sources - Wikipedia

    en.wikipedia.org/wiki/List_of_GIS_data_sources

    SoilGrids1km is a collection of updatable soil property and class maps of the world at a resolution of 1 km produced using state-of-the-art model-based statistical methods. Presents estimates (means and 90% confidence intervals) for pH, texture (sa, si, cl), organic carbon and more for 6 depth layers up to 2 m depth.

  3. Data model (GIS) - Wikipedia

    en.wikipedia.org/wiki/Data_model_(GIS)

    In a manner similar to that shown in figure 11, the stack-unit's occurrence (the map unit's outcrop), geometry (the map unit's boundaries), and descriptors (the physical properties of the geologic units included in the stack-unit) are managed as they are for a typical 2-D geologic map. [31] Raster-based stacked surfaces depict the surface of ...

  4. Shapefile - Wikipedia

    en.wikipedia.org/wiki/Shapefile

    The shapefile format is a digital vector storage format for storing geographic location and associated attribute information. This format lacks the capacity to store topological information. The shapefile format was introduced with ArcView GIS version 2 in the early 1990s. It is now possible to read and write geographical datasets using the ...

  5. ArcGIS - Wikipedia

    en.wikipedia.org/wiki/ArcGIS

    ArcGIS 9 was released in May 2004, which included ArcGIS Server and ArcGIS Engine for developers. [39] The ArcGIS 9 release includes a geoprocessing environment that allows execution of traditional GIS processing tools (such as clipping, overlay, and spatial analysis) interactively or from any scripting language that supports COM standards.

  6. GIS file format - Wikipedia

    en.wikipedia.org/wiki/GIS_file_format

    There are some important advantages and disadvantages to using a raster or vector data model to represent reality: Raster datasets record a value for all points in the area covered which may require more storage space than representing data in a vector format that can store data only where needed.

  7. Geospatial metadata - Wikipedia

    en.wikipedia.org/wiki/Geospatial_metadata

    Geospatial metadata (also geographic metadata) is a type of metadata applicable to geographic data and information.Such objects may be stored in a geographic information system (GIS) or may simply be documents, data-sets, images or other objects, services, or related items that exist in some other native environment but whose features may be appropriate to describe in a (geographic) metadata ...

  8. World file - Wikipedia

    en.wikipedia.org/wiki/World_file

    Graphical view of world files parameters and computed values of the four first upper left pixels of an image. The generic meaning of the six parameters in a world file (as defined by Esri [1]) is: Line 1: A: pixel size in the x-direction in map units/pixel; Line 2: D: rotation about y-axis; Line 3: B: rotation about x-axis

  9. Geographic information system - Wikipedia

    en.wikipedia.org/wiki/Geographic_Information_System

    Scanning a map results in raster data that could be further processed to produce vector data. When data is captured, the user should consider if the data should be captured with either a relative accuracy or absolute accuracy, since this could not only influence how information will be interpreted but also the cost of data capture.