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addtocells Parameter in shp2vec

O

osman

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74
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germany
Looking thru the documentation I could not make out what excatly is the scope of a cvx file produced without the -addtocells parameter. As I understand a cvx file made without that parameter would overwrite the files(s) in the original scenery.
Two questions for which I could not find an answer:
- is that true for _all_ vector data in the original cvx file, even if the new file contains only data of one category (e.g. only roads) ?
- Probably only those vectors are overwritten which are within a "cell" for which new data are provided, but how large is a "cell" that will be overwritten this way?
I gather that in some cases knowing this could allow us to make scenery without including unnecessary exlude files, if all or some vectors are excluded automatically just by making a cell without the -addtocells parameter.
 
rhumbaflappy

rhumbaflappy

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Staff member
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5,944
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us-wisconsin
The clip level is QMID 11 ( LOD 9 ), so without any experimentation, that is the replacement level. ( traffic is QMID 15 )

If you wish to replace exactly the contents of that "cell", then first clip the shapefile to the QMID 11, then compile without -addtocells. This should replace traffic as well, as the QMID 15 is a subset of the QMID 11.

It might be a matter of semantics, but you aren't actually excluding. Excluding takes out entire lines or polys ( including flattens if desired ) that are intersected with the exclude poly. For example, if a lake straddles more than one QMID 11, then the portion of the lake not in the replacement cell is left untouched.

Without experimenting, I do not know what happens to the flattens/mesh.

Dick
 
D

DougMatthews

Messages
288
Country
us-washington
rhumbaflappy said:
The clip level is QMID 11 ( LOD 9 ), so without any experimentation, that is the replacement level. ( traffic is QMID 15 )

If you wish to replace exactly the contents of that "cell", then first clip the shapefile to the QMID 11, then compile without -addtocells. This should replace traffic as well, as the QMID 15 is a subset of the QMID 11.

It might be a matter of semantics, but you aren't actually excluding. Excluding takes out entire lines or polys ( including flattens if desired ) that are intersected with the exclude poly. For example, if a lake straddles more than one QMID 11, then the portion of the lake not in the replacement cell is left untouched.

Without experimenting, I do not know what happens to the flattens/mesh.

Dick
Click to expand...

Flattens are vector data, so they are affected. Mesh would not be affected by this mechanism.

-Doug
 
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