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P3D v5 Does scenProc recognize NULL values?

Clutch Cargo

Clutch Cargo

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unitedstates
I have a dataset where the field is VegType and the value in there says NULL. Not sure if is a string "NULL" or a numeric value or a null set or what? I have tried using it as a filter in many ways in the Step LineToPolygon such as:

LineToPoint|fclass="residential" AND VegType=NULL
LineToPoint|fclass="residential" AND VegType="NULL"
LineToPoint|fclass="residential" AND VegType=""
LineToPoint|fclass="residential" AND VegType=0
LineToPoint|fclass="residential" AND VegType="0"

But have been able to produce any results?
 
No, when an attribute shows as NULL in QGIS it is not present. Scenproc will simply not have the attribute on the feature in that case.

I think the filter VegType<>"*" should capture that.
 
I did try VegType<>"*" and no go. Let me dig into this a little deeper as I think something is going on here. Below is a screenshot showing a selected area from a polygonal file called Land Cover (highlighed in yellow). It's a very precise map breaking down data to the pixel it looks like.

scenProc QGIS LC highlighted.jpg


(1) Do you think the "holes" in the selection could be effecting scenProc's processing? Because if I use this step:

LineToPoint|fclass="residential"|SINGLE|100|4|50|String;TYPE|WHITELIGHT|HDG

I get lights with no issues. But the minute I add the LandCover as part of the filter like in this step:

LineToPoint|fclass="residential" AND VegType="*"|SINGLE|100|4|50|String;TYPE|WHITELIGHT|HDG

I get no lights at all... anywhere.

(2) Looking at the highlighted area there and several polys selected and some will have different VegTypes inside those polys. Do you think by having a residential road (line) running across different VegType polys (maybe even going back and forth), is overwhelming scenProc so no agn is produced?

So this may not be an issue of "NULL" values but the Land Cover file itself. I do have an older way I would make my LandCover maps so I think I may need to test between the two methods.

Your thoughts?
 
Clutch Cargo said:
(1) Do you think the "holes" in the selection could be effecting scenProc's processing? Because if I use this step:

LineToPoint|fclass="residential"|SINGLE|100|4|50|String;TYPE|WHITELIGHT|HDG

I get lights with no issues. But the minute I add the LandCover as part of the filter like in this step:

LineToPoint|fclass="residential" AND VegType="*"|SINGLE|100|4|50|String;TYPE|WHITELIGHT|HDG

I get no lights at all... anywhere.
Click to expand...
The LineToPoint step only takes libe features as input. So you can't have a polygon in your filter, there will not be a feature matching that filter.

What you maybe want to do is test if the line is inside a polygon that matches the right vegetation type?
 
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