Tag Archives: mapping
What is LiDAR Mapping?
LiDAR is an acronym for Light Detection And Ranging. It can functionally be defined as the integration of three technologies into one system which is capable of acquiring data to generate digital elevation models. The three technologies that are combined to generate digital elevation models are lasers, inertial navigation systems and, the global positioning system. LiDAR mapping, therefore, refers to the use of remote sensing technology to create high resolution maps. These digital elevation maps are made by LiDAR equipment usually stationed in aircrafts. This technology is applied in many fields such as geography, archaeology, and seismology. This optical remote sensing technology measures the characteristics of scattered light and information of distant targets. The distance to a target or object is measured using time delay between pulses that are transmitted and the consequent signals which are reflected and detected. LiDAR uses much shorter electromagnetic wavelengths which are Read more…
Satellite Images and GIS Aid in Disease Mapping and Surveillance
Also known as Landscape Epidemiology, which involves the identification of geographical areas where disease is transmitted. By knowing the vegetation and geologic conditions necessary for the maintenance of specific pathogens in nature, one can use the landscape to identify the spatial and temporal distribution of disease risk. Key environmental elements, including elevation, temperature, rainfall, and humidity, influence the presence, development, activity, and longevity of pathogens, vectors, zoonotic reservoirs of infection, and their interactions with humans. To view original story go here http://news.satimagingcorp.com/2009/10/satellite_images_and_gis_aid_in_disease_mapping_and_surveillance.html Vegetation type and distribution are also influenced by the environmental variables mentioned above, and can be expressed as landscape elements that can be sensed remotely and whose relationships can be modeled spatially. For the past 29 years, satellite sensors have proved to be valuable tools for describing the earth’s landscape. Since the launch of Landsat 7 and ASTER, NASA has initiated programs to integrate these technologies into the Read more…
Geographic Information Systems and Map Services
The City’s Geographic Information System (GIS) staff provides information about the City to its citizens and employees. We maintain accurate corporate limits, streets, zoning, and many other layers of information in our City’s GIS system. We also provide technical assistance to other departments to help them develop and maintain their own GIS information. Our staff is currently working towards creating a system from which all City employees will have real time access to our GIS information. The most common way that we communicate GIS information with residents and employees is through maps. We can produce maps up to 34″ x 44″ in size for a minimal fee. Citizens can request a map by emailing us at mckeet@ci.charleston.sc.us, calling or coming by our office at 75 Calhoun Street. Some of our most popular maps are available online for viewing and downloading. A Geographic Information System (GIS) is a system of computer Read more…
