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Create a tile cache from mosaic dataset without overviews?

DanDowning

Arcgis Server / Linux

Should this work?

With a small subset of images I created a mosaic (with overviews) and created an image service. I then created the tile cache and everything worked fine. I'm trying to do the same thing with all the images, but I don't want to create the overviews. Should I be able to create the cache this way? Tiles are generated, but they are just white.

I found this technical article: 39255 - Caching process creates blank/white tiles when using Mosaic dataset but it didn't help me.

Thanks.

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Accepted answers

JakeSkinner

Hi Dan,

The raw imagery will only be visible to a certain scale. If there is no data at the scale, the cache tile will be blank/white. Take a look at the link that provides a formula you can use to calculate what the max scale will be:

http://resources.arcgis.com/en/help/main/10.2/index.html#//009t00000042000000

For example, if the MaxPS was 120, the max scale the data would be visible at would be:

120 * 96 / 0.0254 = 453,543

Any reason you don't want to create the overviews?

All comments

JakeSkinner

Hi Dan,

http://resources.arcgis.com/en/help/main/10.2/index.html#//009t00000042000000

For example, if the MaxPS was 120, the max scale the data would be visible at would be:

120 * 96 / 0.0254 = 453,543

Any reason you don't want to create the overviews?

DanDowning

Hi Jake,

Thanks for the quick reply. I'm trying to avoid the overviews just to cut out any overhead that I can. There are about 300 Gb of images which is going to give us about 1 Tb of cache. I figured I'd try to save time/storage wherever I can.

The MaxPS is 9.75 so I get a max scale for the raw imagery of 36,850. I started with just caching a few levels (for testing) and I definitely didn't get to that scale so I guess that explains the white tiles.

So I assume the answer is to create overviews, right?

Thanks again

larryzhang

Dan,

Yes, MD with overviews should be used to generate caches.

By the way, worth to share two points:

1. (on your reply: generating 1TB caches from only 300 GB), the figure estimation from GP tools for the size of 'to-be-generated' caches is not right. If that is true, better to check the schema you are using..

2. please genetate caches in desktop (not in server-side). In other words, GP tools for caches can be found under 'data management tools'. In this way, you can avoid network tranffic and improve the performance for caching...

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