Yes, you need to construct the polygon to calculate the area (or length).
JTS has all the tools required to do this. Look at the GeometryFactory.
On Tue, Sep 23, 2014 at 3:22 PM, Alireza Rezaei Mahdiraji <
alireza...@gmail.com> wrote:
>
> Thanks Craig,
>
> What about the case where we have two point nodes, how do we compute the
> length, or when we have a set of points related to a
> polygon, how do we compute the area? Shall we create linestring and
> polygon first and then compute length and area?
>
> Thanks,
> Best,
> Alireza
>
>
> On Friday, September 19, 2014 9:45:02 PM UTC+2, Craig Taverner wrote:
>>
>> I'm assuming these are nodes that represent geometries. In that case you
>> should convert them to the JTS Geometry object and get the length and area
>> from that.
>>
>> For example, if you did a search with the GeoPipeline, you will return a
>> collection of SpatialDatabaseRecord objects, which contain the node and the
>> geometry. You could do something like:
>>
>> for(SpatialDatabaseRecord record:results) {
>> double length = record.getGeometry().getLength();
>> double area = record.getGeometry().getArea();
>> }
>>
>> If you no longer have the SpatialDatabaseRecord, but only the node, you
>> can still convert it to a geometry with:
>> Geometry geom = layer.getGeometryEncoder().decodeGeometry(node);
>>
>> And then call the getLength() and getArea() methods. Check the JTS
>> documentation for more details.
>>
>> On Fri, Sep 19, 2014 at 10:24 AM, Alireza Rezaei Mahdiraji <
>> alire...@gmail.com> wrote:
>>
>>>
>>> Hi All,
>>>
>>> I need to calculate length and area of given node(s) in two cases:
>>>
>>> 1- for length either a node with line string geometry is given or two
>>> nodes with point geometry
>>>
>>> 2- for polygon either a node with polygon geometry is given or the set
>>> of points of the polygon
>>> as separate point geometries.
>>>
>>> I am aware of GeoPipeline.start( boxesLayer ).calculateLength() but it
>>> seems it computes
>>> for all nodes in a layer while I am interested in given set of nodes
>>> (two cases above).
>>>
>>>
>>> Thanks,
>>>
>>> Best,
>>> Alireza
>>>
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>>
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