GIS Dictionary

1 [data capture] A representation or description of a scene, typically produced by an optical or electronic device, such as a camera or a scanning radiometer. Common examples include remotely … Read more

[data structures] An x,y coordinate pair specifying the location of a pixel, or cell, in terms of its row and column position. The x-coordinate gives the column number (commonly starting … Read more

[data capture] Data produced by scanning a surface with an optical or electronic device. Common examples include scanned documents, remotely sensed data (for example, satellite images), and aerial photographs. An … Read more

A digital image processing technique for increasing the contrast between features in an image by dividing the pixel values in the image by the values of corresponding pixels in a … Read more

[data capture] The ratio between a distance in an image and the actual distance on the ground, calculated as focal length divided by the flying height above mean ground elevation. … Read more

1 [ESRI software] In ArcGIS Server, an extension. 2 [ESRI software] In ArcIMS, a public ArcIMS virtual server for image services

1 [ESRI software] In ArcIMS, a service that uses the spatial server image rendering capabilities. When a request is received, a map is generated on the server, and the response … Read more

[ESRI software] In ArcGIS Image Server, a workspace created using the Image Service Definition Editor toolbar that defines the key properties of a service, including name and default spatial reference … Read more

[ESRI software] In ArcGIS Image Server, a file that stores properties for reestablishing a connection to a service and setting up user-defined image service properties. Image service reference files have … Read more

[data structures] The x,y coordinate space defined by the number of columns and rows in a raster dataset. The origin of image space is commonly the center of the top … Read more

[network analysis] A measure of the amount of resistance, or cost, required to traverse a path in a network, or to move from one element in the network to another. … Read more

[ESRI software] In ArcInfo, a routing model that determines the best route by finding the path of least resistance.

[Internet] A process by which a Web application assumes the identity of a particular user and thus gains all the privileges to which that user is entitled.

[programming] In programming an interface, to provide code for each of the methods of an interface (the interface is defined separately).

[data conversion] To bring data from one computer system or application into another. Importing often involves some form of data conversion.