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Feature #574

Updated by Stefan Eichert almost 9 years ago

Whitepaper Geometries 


 Content Topics: 

 Concept 
 1. What types of physical things with locations are there according to the sources 
 1a. How exactly - only polygons or fuzzy is their extend defined 
 1b. Which various possibilites can be observed regarding the identification of an physical object with a spatial position point and line, too? 

 Technical Basics 
 2. What types of geometries are needed to map the spatial extend/position of the objects To do: 

 Technical Details 
 3. Tables used - possibiltiy to represent the objects and their location draw multiple polygones (without holes) 
 4. Queries and Triggers used to update/delete/insert additional/needed information.  

 UI and Userinput 
 5. Buttons and forms 
 5.1. Add Geometry 


 What types of physical things with locations are there according to the sources 
 What we have in the sources (archaeological/written): 
 -roads/routes/rivers 
 --to be displayed as lines/corridors - certainty dropdown 

 -physical things with fixed location (settlements, buildings, regions) 
 --to be displayed as points/polygons Thoughts Stefan: 

 -physical things within larger administrative units 
 --to be displayed as point/polygons 

 UI: what to draw:  
 1. Point: centerpoint of location. Drawn by user  
 2. Polygon: a) Shape of physical thing b) area in which physical thing is located 

 Backend: what to create:  
 if Polygon is drawn/updated GIS-centerpoint should be triggered 



 3. Line: a) exactly known route b) corridor in which route lies 


 Polygons 

 all at once possible in any combination 
 defined by a certain type or subtype 
 Types: 
 Area of possible localisation (with a certain probability, defined by user) 
 Shape of place: E.g. the outline of a village, a building... = you are certain about the localisation 
 Corridor Polygon: Boundaries of a possible route.. Route must lie within the corridor. 

 Fake: Tools and lines: very small/thin polygons 

 To discuss: more than 1 possible location of 1 physical thing 

 Probability/Certainty of location 

 Centerpoint of place: E.g. the point where a strayfind has been found, like a localisation via GPS... 


 How to implement:  

 1-n connection from place (E53-localisation of place) to postgis table - geometry collection or various tables? 
 Probably better with geometry collection -- all in one table 

 to be continued... 





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