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It provides an automated method for establishing measurement locations, performs rate calculations, provides the statistical data necessary to assess the robustness of the rates, and includes a beta model of shoreline forecasting with the option to generate 10 and/or 20-year shoreline horizons and uncertainty bands.
#Extension of arcgis file software
The Digital Shoreline Analysis System (DSAS) v5 software is an add-in to Esri ArcGIS desktop (10.4-10.7+) that enables a user to calculate rate-of-change statistics from multiple historical shoreline positions. Following table shows the arrangement of a Point shape type.Computer Software for Calculating Shoreline Change (or positional change of a boundary over time) Lets take an example of Point Shape type to elaborate how a record contains information about such a shape type.Ī point represents a certain geographic location in the order X,Y where each coordinate is represented by a double-precision value. A shape type of 0 represents a null shape that has no geometric data for the shape. The length of the record contents is reflection of the shape parts and vertices.
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The organization of record header is as shown follow: BytesĪ shapefile record contents consist of a shape type followed by the geometric data for that shape. Record header contains information about the record number and content length of the record in a fixed length of 8 bytes. The main file header is followed by variable length records where each record consists of a fixed-length record header followed by variable-length record contents. The values of shape types field in above table are as follow: Value It is to be noted that the value of file length is the total length of the file in 16-bit words which also includes the fifty 16-bit words making up the header. Organization of this main file header along with byte position, value, type and byte order is as shown in the following table. The main File Header starts from the beginning of the file and is 100 bytes in length. The fixed-length file header is followed by variable-length records where every record is made up of a fixed-length record header followed by variable-length record contents. shp file consists of headers and records. Open specifications of shapefile are available online from ESRI in the form of Technical Description and elaborates the overall structure of the file in detail. There can be other optional files as well that share the same name as the main file.
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These features in combination can represent almost any type of shapes like water wells, country boundaries, spatial points, rivers flow, lakes, etc. Data RepresentationĪs mentioned, a shapefile format describes geospatial information of a data set as vector features. The format has been developed as open specifications in order to facilitate interoperability between ESRI and other software products. It represents Geospatial information in the form of vector data to be used by Geographic Information Systems (GIS) applications. SHP is the file extension for one of the primary file types used for representation of ESRI Shapefile.