MrSID Reader Parameters
Dataset Parameters
This parameter allows you to choose different naming schemes, and the number of feature types generated for the reader.
Feature type name choices:
- From File Name(s):Generates one feature type per source filename.
- From Format Name:Produces only a single feature type containing the format name.
Use this parameter to exposeFormat Attributesin Workbench when you create a workspace:
- In adynamic scenario, it means these attributes can be passed to the output dataset at runtime.
- In a non-dynamic scenario, this parameter allows you to expose additional attributes on multiple feature types. Click the browse button to view the available format attributes (which are different for each format) for the reader.
Using the minimum and maximumxandyparameters, define a bounding box that will be used to filter the input features. Only features that intersect with the bounding box are returned. (Note that this is the bounding box intersection only, and not a full geometry intersection that would be returned by a transformer like theSpatialFilter.)
If all four coordinates of the search envelope are specified as0, the search envelope will be disabled.
Clip to Search Envelope
When selected, this parameter removes any portions of imported features being read that are outside the Search Envelope.
The example below illustrates the results of the Search Envelope whenClip to Search Envelopeis not selected (set to No) and when it is selected (set to Yes).
- No: Any features that cross the search envelope boundary will be read, including the portion that lies outside of the boundary.
- Yes: Any features that cross the search envelope boundary will be clipped at the boundary, and only the portion that lies inside the boundary will be read. The underlying function for theClip to Search Envelopefunction is an intersection; however, whenClip to Search Envelope被选中时,剪切操作也是吗performed in addition to the intersection.
Advanced
Pyramid Level to Read
This parameter specifies the pyramid level from which to read.
Pyramid level 0 represents the original raster data. Values greater than 0 represent increasingly reduced levels of image resolution.
Each pyramid level has half the number of rows and columns of the previous level.