Of points in the file, point IDs, and their coordinates are listed. Feature-encoded vector files are very simple. Vector file structures in ASCII format so that you can evaluate the content of (assigned to points and stored in the vector file itself) OR may be storedĮxternally in a table and linked through IDs stored in the vector fileįor analytical purposes, vector files must be coded inīinary format, but the View structure feature in Idrisi File Explorer displays Must be kept in separate files (as in many GIS) Other words, features are recognized, but spatial analysis is limited.įormat allows us to display vector features properly, to convert dataīetween raster and vector formats, and to link vector features to theĪttribute table and query database. Objects (points, lines, and polygons), but, in contrast to Arc/Info or Cartalinx, it does not recognize topological information ( connectiveness or neighborliness of vector features). "spaghetti" vector structures, Idrisi recognizes vector features or Idrisi uses feature-encoded vector files. The degree to which the computer recognizes and can analyze vector objects as "spaghetti", feature-encoded, and topological files. There are three major types of vector files: Maximum attribute value as discussed above. Meant by a flag value in this case (unavailable data, excluded data values,Īttribute values as discussed above. Here they are landuseįor which a landuse value is unavailable. Qualitative, these codes only indicate the difference in types of landuse classes.įor attribute data. In this case value units are landuse categories (classes). Here 30 meters (see reference units above). Spatial information is measured (e.g., cell resolution, distance between Info on Reference System Parameter files) Parameter file, such as UTM, SPC, and hundreds of others). (Lat/Long), or a specific referencing system defined by a Reference System Geographic reference system ( e.g, plane, geographic byte, integer (simple integer), and real (floating point). Min and max X and Y, min and max attribute values, Make sure you understand the difference between Also use Help/ File structure to read aboutįile structures in Idrisi. My comments are to the right of eachĭocumentation field. Metadata icon is also accessible from Fileįrom the Tool bar at the top of the Idrisi application window. To see the contents of a raster documentation Stores the information about the data itself and how it Note columnĪnd row positions displayed for every attribute value.
In Idrisi, rows are counted starting from 0 top to bottom, columns starting fromĠ left to right.
#Arcgis file type basics software#
Pixel and going left to right top to bottom.ĭocumentation file tells the software when to draw the next row of Cell values are displayed starting with the upper left Number of columns and rows, which tells the software where to begin to draw the Long list of pixel values (column of values). Raster files have a very simple structure. Run-length encoding, quad-tree structures. FeatureCollection objects contain sets of features.Raster data files include simple raster files (most programs), Geometric objects with additional properties are Feature objects. GeoJSON supports the following geometry types: For example, mobile routing and navigation apps might describe their service coverage using GeoJSON. GeoJSON features are not only used to represent entities of the physical world.
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