Changes between Version 13 and Version 14 of WKTRaster/SeamlessArchitecture

Timestamp:

Jul 19, 2011, 7:30:04 AM (13 years ago)

Author:

bnordgren

Comment:

—

WKTRaster/SeamlessArchitecture

@@ -96 +96 @@
 === Spatial information with associated numeric value ===
 
-Vectors represent combined spatial and value information with a structure, record, datatype, or class which has a geometry part and a value part. In [http://docs.codehaus.org/download/attachments/31212/ISO19123 Primer.pdf ISO 19123] this is represented as the type `CV_GeometryValuePair`. In the postgis raster extension, there is a `geomval` type. Any data structure which enforces a one-to-one relationship between a particular geometry and a particular list of values will accomplish this end. Using such a structure, there is a clear separation: the geometry conveys the spatial information and the value conveys the value information.
+Vectors represent combined spatial and value information with a structure, record, datatype, or class which has a geometry part and a value part. In [http://docs.codehaus.org/download/attachments/31212/ISO19123%20Primer.pdf ISO 19123] this is represented as the type `CV_GeometryValuePair`. In the postgis raster extension, there is a `geomval` type. Any data structure which enforces a one-to-one relationship between a particular geometry and a particular list of values will accomplish this end. Using such a structure, there is a clear separation: the geometry conveys the spatial information and the value conveys the value information.
 
 Rasters have the ability to store one or more numeric values at each cell. The number of values present at each cell is exactly equal to the number of bands present in the overall raster. Each band may have a different numeric type, and the bands are ordered. Spatial information is conveyed by "nodata" values: cells containing the "nodata" value are equivalent to cells in a mask containing "false" values. Conversely, cells containing any value ''other than'' the "nodata" value are equivalent to cells in a mask containing true values. Each band may possess a unique "nodata" value which applies only to that band.