All map features disapear after sooming in tight.

[bclay1297]

Working with version 3.8 on windows 10, using visual studio 2022.

when I load a MrSID NAIP file everything looks ok but when I zoom in all rasters and vectors disappear and only the blue background shows even though I am still a few throusand feet above ground.

I tested osgEarth_viewer with a simple.earth file that I added the MrSid image to and it did not have the same drop out.

After a few more tests I tried loading the original simple.earth file and used that as my base layer then added the other features and did not have the drop out.

I can work with this configuration but I do not understand what is happening. Is it a memory issue or some LOD defined in the earth file loader I do not have in my code?

[jasonbeverage]

Can you share the file you are loading and an earth file that reproduces the issue?

[bclay1297]

The NAIP MrSid file is over 7gig. you might not want me to post here but it is one of the county sized NAIP images you can get directly by downloading from https://nrcs.app.box.com/v/naip. The error showed in our app without the earth file. Since I added the simple.earth file I have not seen the error. We normally do not use an Earth file because we need to make dynamic changes to the scene. Since it is only used in this case, it will only affect the loading of the monthly Blue Marble images. Even there we should be able to hide the base layer and fade in / out the monthly images

[gwaldron]

Post the earth file anyway.

[bclay1297]

per your request - could not attach the file - system rejected it

This is a modified simple.earth - when zoomed all that way in, all features disappeared. The sid image is over 7 gig and the other files come from the standard osgEarth data collection

---

../data/world.tif

<GDALImage name="GreeneCo">
    <url>D:/Tools/data/GreeneCo/Greene_2024_rgb_100x.sid</url>
</GDALImage>

<OGRFeatures name="US-Data">
    <url>../data/world.shp</url>
</OGRFeatures>

<TiledFeatureModel name="US States" features="US-Data">
    <styles>
        <style type="text/css">
            states {
               stroke: #ffff00; 
               stroke-width: 2px;
               render-depth-offset: true;
            }                    
        </style>
    </styles>        
</TiledFeatureModel>

[jasonbeverage]

Bruce I tried to make a local sample that reproduces your issue. I downloaded one of the county level NAIP files and made a similar map to what you have.

The image itself is just fine and stay s on screen the whole time when I zoom in on it.

The TiledFeatureModel is disappearing b/c the earth itself is getting more verts and more defined curvature when you zoom in. You can turn on wireframe by hitting 'w' and see it is still there.

You can use a FeatureModel layer with terrain-drape if you'd like, I noticed that it doesn't work with TiledFeatureModel

 <FeatureModel name="Countries" features="US-Data">
        <styles>
            <style type="text/css">
            states {
               stroke: #ffff00; 
               stroke-width: 2px;
               render-depth-offset: true;
               altitude-clamping:  terrain-drape;
            }                    
            </style>
        </styles>
    </FeatureModel>

I'm not sure why your imagery is disappearing, can you show a video or point me to file you used on the NAIP website so I can download it?