Hi all,
I made an upgrade of Measure extension plugin to version 0.9
The measure tools are available under PLUGIN>MEASURE menu.
All tools are subdivided into two submenus (Projected and Geographic
coordinates)
-- Projected Coordinates --
These tools use JTS libraries embedded into OpenJUMP to calculate under
metrics coordinates
- Measure length of a segment
- Measure length of a linestring
- Measure area of a polygon
- Measure area of a rectangle
- Measure area of a circle by radius
- Measure area of a circle by 3 points
- Measure angle between two segments (2 points click)
- Measure angles of a triangle
- measure angle by goniometer
- Measure azimuth of a segment
- Measure azimuth of an angle bisector
- Measaure Easting/Northing coordinates
-- Geographic coordinates --
There tools are under development and use different libraries to define
measurements under geographic coordinates (only EPSG4326 )
- Measure length of a segment (*)
- Measure length of a linestring (*)
- Measure area of a polygon (**)
- Measure azimuth of a segment (**)
- Measure latitude/longitude
(*) These tools use an embedded library of Vincency's algorithms. WARNING:
these tool are still under test as they can have an error of measure
between 0.5% to 5% . It is not recommended to use them for accurate measure
(**) These tools use an experimental algorithm deriving from paper: "Some
Algorithms for Polygons on a Sphere", R.G. Chamberlain, W.H. Duquette, JPL
Publ 07-3, 2007, But modified to calculate local radius on a sheroid
instead of a shere. WARNING: the approximation of this algorithm is
probably better (in some areas) than original Chamberlain's et al. ones but
it still has an error that depends on latitude and dimension of area. It is
not recommended to use them for accurate measure
All angle measurement are now expressed in degrees
This extension is available at GeoArbores SourceForge site, here:
http://sourceforge.net/projects/opensit/files/Openjump/PlugIn/MeasureExtension/
regards
Peppe
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