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Why is my raster not showing up?
Here are some trouble shooting ideas for you: Check the file size to make sure all of the data exists. Calculate Pyramids in case your raster dataset is difficult to view because of a huge file size. Calculate Statistics to ensure you are able to view the correct range of data.
What values does the raster actually store?
Rasters are stored as an ordered list of cell values. For example, 80, 74, 62, 45, 45, 34, and so on. The area (or surface) represented by each cell consists of the same width and height and is an equal portion of the entire surface represented by the raster.
Why would a raster layer not have an attribute table?
The mechanism to automatically build a raster attribute table is not available in ArcGIS Desktop 9.2, as scanning all pixel values to build a raster attribute table on-the-fly is unnecessary if the unique value renderer is not used for displaying raster data in images that are getting larger.
Why is it called on the fly?
In a hurry, on the run, as in I picked up some groceries on the fly. The transfer of this expression, which literally means “in midair or in flight,” dates from the mid-1800s.
What does living on the fly mean?
To do something on the fly is to do it quickly. When people rush, they’re working on the fly. Sometimes people take their time, doing things slowly, carefully, and deliberately.
What happens when you rasterize an image?
Rasterizing a layer means you are converting a vector layer to pixels. This changes how your layer is displayed and what editing capabilities you have. When a vector becomes rasterized, you can see the pixels along the edges instead of a clean line. However, you gain the ability to directly edit the layer.
How to set default location in raster dataset?
The Raster Dataset tab allows you to set six different defaults: The default pyramid building option when they don’t exist The default location to retrieve the georeferencing source The maximum number of unique values within a raster attribute table
Why do I need to calulate my raster data?
Calulate statistics on the raster. You need the statistics to be able to apply stretches etc when displaying your new mosaic. The values you see are just the default max and min values possible for the pixel depth of your raster and not the actual range of the data within it.
Why is raster mosaic not displaying raster values?
The individual rasters are displaying correctly, but when I try to combine them in a Raster Mosaic I get arbitrary values (3.4+038 -> -3.4+038), which is considered to be NoData. I’ve tried several times, half the time I get a warning message upon creation of the Mosaic (001003: Datum Conflict) even though I was sure to match coordinate systems.
Why is my raster data not visible in ArcCatalog?
I have a raster dataset that is not visible in Data View, but it is listed in the Table of Contents. I have tried viewing it in ArcCatalog but it is not visible there either. Is there something I can do make it visible so I can perform further analysis?