I created a mosaic dataset from a set of 12 tiff's spanning the united states. Before running
Build Overviews, the images all join together nicely. But after, they look like this:
Any idea what is going on? Did i do something wrong? Should I have merged the mosaic to a single image first?
Per the comment by @PolyGeo, here is a detailed step by step:
- Gather source data from the FAA (The 12 files under High Altitude Enroute (U.S.) GEO-TIFF Files)
- Unzip each zip file into a directory
- Each of these
tiffiles have an associated
htmlfile that shows some metadata, specifically:
Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257222
- Open ArcMap (10.3.1.4959 License type Advanced), then create a new Blank Map
- Under catalog, right click on any gdb, choose New -> Mosaic Dataset...
- On the Create Mosaic Dataset dialog:
- Under Coordinate System, choose NAD 1983
- Click Environments...
- Under Raster Storage set Pyramid resampling technique and Resample to CUBIC
- Click OK
- Once the dataset is created, right click it and Add Rasters...
- Under Input Data choose Dataset then browse for the 12 tif files from 1.1 above
- Set Environments... the same as 4.2 above
- Click OK
- Then, I created feature polygons for each tif by clicking through the map file at all the corners of the useful data and used that to modify the footprints for each raster (note that I also set Always Clip The Image To Its Footprint)
At this point I have a nicely stitched together mosaic dataset. But when i zoom out past
1:1,250,000 it stopped rendering the image. I analyzed the dataset which provided the warning that I was missing overviews. So i went ahead and right clicked the mosaic dataset, then Optimize -> Build Overviews. The result, is what you see in the attached image...