Georeferencing is done with a datum. A datum is usually given by a starting point and direction: it specifies where a clearly identifiable point on earth (the base point) should appear on the spheroid and it shows where a base direction, such as north, points on the spheroid at the base point.
(Buffalo), Rochester Institute of Technology Physician Assistant Program, Rochester Institute of Technology Ultrasound Program, D Jefferson-Lewis BOCES in Watertown, St. Lawrence medical laboratory technician and radiologic technologist for taping. Hudson Mohawk AHEC.
The Picture Exchange Communication System (PECS) was developed over a decade ago as a unique augmentative, alternative training package that allows children and adults with Autism and other communication difficulties to initiate communication.ECS begins with teaching students to exchange a picture of a desired item with a teacher, who immediately honours the request. For example, if they want a drink, they will give a picture of 'drink' to an adult who directly hands them a drink.