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Using GIS

 

 

 

 

TPC interfaces with GIS (Graphical Information Systems) via shape files.


What are Shapes?

A shape is a set of vector coordinates that define a feature. TPC supports a number of shapes, including Points, Polylines and Polygons. A hard and fast rule of shape files is that a shape file can contain only one kind of shape. So all the shapes in a file must be points, polylines, or polygons, etc.


What are Shape Files?

Shape files store GIS data. More specifically, they store non-topological geometry and attribute information for the spatial features in a GIS data set. Shapes define positions, boundaries and areas. TPC supports the shape definitions defined in ‘ESRI Shape File Technical Description – An ESRI White Paper – July 1998'.

Shape Files Sets

Shape files come in sets of three –

1.a Shape file (.SHP) that includes the shapes themselves

2. an Index file (.SHX) that stores the locations of the individual shapes in the Shape file

3. a Database file (.DBF) that stores the attributes of each shape.

The three files always share the same file name, as in Phase1.SHP, Phase1.SHX and Phase1.DBF.

Every Shape file must also have an Index file and Database file. Therefore, when TPC writes a shape file, it also writes the corresponding index file and database files.


Exporting Shape Files

TPC can export Points, Traverse and Drawings as shape files. You'll want to consider which export option is best for you.

Importing Shape Files

TPC can import shape files into the survey, creating points and traverses or into a drawing, creating points and polylines.


Coordinate System

TPC supports three coordinate systems used with shape files by reading and writing their corresponding projection (.prj) file.

Geographic

TPC imports / exports geodetic positions for all shapes using a projection file (.prj) that includes the GEOGCS[] information.

The following is in example of what it will look like.

GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]

You must have a CRS (Coordinate Reference System) selected for your survey in order to export geographic shapes.

Projected

TPC imports / exports coordinates for all shapes using a projection file (.prj) that includes the PROJCS[] information.

The following is in example of what it will look like.

PROJCS["NAD_1983_StatePlane_Washington_South_FIPS_4602", GEOGCS["GCS_North_American_1983", DATUM["D_North_American_1983", SPHEROID["GRS_1980",6378137.0,298.257222101] ], PRIMEM["Greenwich",0.0], UNIT["Degree",0.0174532925199433] ], PROJECTION["Lambert_Conformal_Conic"], PARAMETER["False_Easting",500000.0], PARAMETER["False_Northing",0.0], PARAMETER["Central_Meridian",-120.5], PARAMETER["Standard_Parallel_1",45.83333333333334], PARAMETER["Standard_Parallel_2",47.33333333333334], PARAMETER["Latitude_Of_Origin",45.33333333333334], UNIT["Meter",1.0] ]

You must have a CRS (Coordinate Reference System) selected for your survey in order to export geographic shapes.

Local

TPC imports / exports coordinates for all shapes without the use of a projection (.prj) file.


Related Topics

What Shapes Are Supported
Exporting Point Shapes
Exporting Traverse Shapes
Exporting Drawings
Importing Shapes into a Survey
Importing Shapes into a Drawing
Shape Settings
Projections Files

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