The refractile outer portion of the inner member of a rod or cone cell. It is located between the myoid and the outer member of the cell, and contains mitochondria. The myoid is in contact with the external limiting membrane of the retina while the outer member is next to the pigment epithelium. 2. Surface of revolution generated by rotating an ellipse about a major or minor axis.
Definition of GIS. A geographic information system (GIS) is a system designed to capture, store, manipulate, analyze, manage, and present all types of geographical data. The key word to this technology is Geography â this means that some portion of the data is spatial. In other words, data that is in some way referenced to locations on the earth.
GIS is a very powerful decision-making tool that has a massive range of applications, whatever your business â resource management, logistics, planning, transport, surveying, demographic studies, epidemiology and environment, to name but a few.Changes in a particular area or feature over time can be measured.eed and pest management. Invasive weeds and pests can lead to massive economic costs. GIS is used to determine the areas infested by mapping in the field (recording perimeters of infested areas or recording individual points/sightings) or using satellite imagery/remote sensing.