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nodata_value is the value that is regarded as "missing" or "not applicable"; this line is optional, but highly recommended as some programs expect this line to be declared (a real number). The remainder of the file lists the raster values for each cell, starting at the upper-left corner.
In this case, some raster file formats allow a vector-like table of attributes to be joined to the raster by matching the ID values. [18] Raster representations of objects are often temporary, only created and used as part of a modelling procedure, rather than in a permanent data store. [20]: 135-137 To be useful in GIS, a raster file must be ...
The value recorded for each cell may be of any level of measurement, including a discrete qualitative value, such as land use type, or a continuous quantitative value, such as temperature, or a null value if no data is available. While a raster cell stores a single value, it can be extended by using raster bands to represent RGB (red, green ...
Cost distance tools are available in most raster GIS software: GRASS GIS (often bundled into QGIS), with separate accumulation and drain functions; ArcGIS Desktop and ArcGIS Pro, with separate accumulation (Cost Distance) and drain geoprocessing tools, as well as Corridor generation. Recently, starting with ArcGIS Pro version 2.5, a new set of ...
In raster data analysis, the overlay of datasets is accomplished through a process known as "local operation on multiple rasters" or "map algebra", through a function that combines the values of each raster's matrix. This function may weigh some inputs more than others through use of an "index model" that reflects the influence of various ...
ArcGIS Desktop Basic, formerly known as ArcView, [79] is the entry level of ArcGIS licensing. With ArcView, one is able to view and edit GIS data held in flat files, or view data stored in a relational database management system by accessing it through ArcSDE .
ESRI's ArcGIS 8.3+ has the capability of rubbersheeting vector data, and ArcMap 9.2+ may also rubber-sheet raster layers.; Autodesk's AutoCAD Map 3D [1] and AutoCAD Civil 3D (which includes most of AutoCAD Map 3D's functionality) allows a user to rubbersheet vector data, and Autodesk's Raster Design (an add-in product for AutoCAD-based products) allows a user to rubbersheet raster data.
The Esri TIN format is a popular yet proprietary geospatial vector data format for geographic information system (GIS) software for storing elevation data as a triangulated irregular network.