Gis 23 Lecture 3 Gis Data Representation Modeling Pdf Efficiency considerations: storage requirements processing to structure data into the desired storage format processing for simple retrieval and display of data the suitability of the data model to allow the data to be manipulated for spatial operations or spatial modelling. In contrast to the raster data model is the vector data model. in this model, space is not quantized into discrete grid cells like the raster model. vector data models use points and their associated x, y coordinate pairs to represent the vertices of spatial features, much as if they were being drawn on a map by hand (aronoff 1989).aronoff, s. 1989. geographic information systems: a management.
Vector Data Model Gis Pdf Geographic Information System Curve 6.1 vector data models in contrast to the raster data model is the vector data model. in this model, space is not quantized into discrete grid cells like the raster model. vector data models use points and their associated x, y coordinate pairs to represent the vertices of spatial features, much as if they were being drawn on a map by hand. the data attributes of these features are then stored. The best data model for a given organization or application depends on the most common operations, the experiences and views of the gis users, the form of available data, and the influence of the data model on data quality. Vector data model is an object based approach to the representation of real world features. this data model is best suited to represent discreet objects. in this method the entire earth surface feature including man made and natural can be represented by only three entities in gis. these entities name. Raster data model raster data models cover an area with a uniform grid of points. raster data is basically the same data that you have when you take a picture. in gis, these "pictures" just referenced to the earth. in gis, we can represent a large variety of information in rasters. below is a "digital elevation model" or "dem".
Gis Data Models Raster Data Model Vector Data Model Gisrsstudy Vector data model is an object based approach to the representation of real world features. this data model is best suited to represent discreet objects. in this method the entire earth surface feature including man made and natural can be represented by only three entities in gis. these entities name. Raster data model raster data models cover an area with a uniform grid of points. raster data is basically the same data that you have when you take a picture. in gis, these "pictures" just referenced to the earth. in gis, we can represent a large variety of information in rasters. below is a "digital elevation model" or "dem". Again, the vector data model is best for describing discrete geographic entities that have sharp boundaries such as streets and buildings. however, the vector model is commonly used to define entities that have fuzzy and less discrete boundaries. Raster and vector data model and structures geographic information system is a computer system for capturing, storing, quiering, analyzing and displaying the geographical data. the gis can be grouped to computer system, gis software, brain ware and infracture. since late 1960‟s computer have been used to store and process geographic data.
Gsp 270 Data Models Again, the vector data model is best for describing discrete geographic entities that have sharp boundaries such as streets and buildings. however, the vector model is commonly used to define entities that have fuzzy and less discrete boundaries. Raster and vector data model and structures geographic information system is a computer system for capturing, storing, quiering, analyzing and displaying the geographical data. the gis can be grouped to computer system, gis software, brain ware and infracture. since late 1960‟s computer have been used to store and process geographic data.
68 Gis Data Models Discovering New Insights From Gis Data Models