Changes between Version 242 and Version 243 of WKTRaster/SpecificationWorking03

Timestamp:

10/02/12 11:16:43 (12 years ago)

Author:

pracine

Comment:

—

WKTRaster/SpecificationWorking03

@@ -498 +498 @@
   This function can further be generalised by adding parameters to define a buffer area around the pixel centroid or the pixel boundary. This would provide a category 4 type of function. (e.g. ST_Density())
 
- The METHOD could be:
-
-  * from any kind of coverage: COUNT, DISTINCT_COUNT, COUNT_MOST_FREQUENT, COUNT_LEAST_FREQUENT, MOST_FREQUENT_VALUE, LEAST_FREQUENT_VALUE, MAXIMUM, MINIMUM, RANGE, SUM, MEAN, STDDEV
-
-  * from a line coverage could also be MAX_LENGTH, MIN_LENGTH, LENGTH_RANGE, LENGTH_SUM, LENGTH_MEAN, LENGTH_STDDEV, COMBINED_MAX_LENGTH, COMBINED_MIN_LENGTH, COMBINED_MEAN_LENGTH, COMBINED_STDDEV_LENGTH, LENGTH_OF_LINE_WITH_GREATEST_VALUE, LENGTH_OF_LINE_WITH_SMALLEST_VALUE, LENGTH_OF_LINE_WITH_MOST_FREQUENT_VALUE, LENGTH_OF_LEAST_FREQUENT_VALUE, VALUE_OF_LONGEST, VALUE_OF_SHORTEST, VALUE_OF_COMBINED_LONGEST, VALUE_OF_COMBINED_SHORTEST, WEIGHTED_SUM, WEIGHTED_MEAN
-
-  * from a polygon coverage could also be MAX_AREA, MIN_AREA, AREA_RANGE, AREA_SUM, AREA_MEAN, AREA_STDDEV, COMBINED_MAX_AREA, COMBINED_MIN_AREA, COMBINED_MEAN_AREA, COMBINED_STDDEV_AREA, AREA_OF_POLYGON_WITH_GREATEST_VALUE, AREA_OF_POLYGON_WITH_SMALLEST_VALUE, AREA_OF_POLYGON_WITH_MOST_FREQUENT_VALUE, AREA_OF_LEAST_FREQUENT_VALUE, VALUE_OF_LARGEST, VALUE_OF_SMALLEST, VALUE_OF_COMBINED_LARGEST, VALUE_OF_COMBINED_SMALLEST, WEIGHTED_SUM, WEIGHTED_MEAN, MEAN_VALUE_AT_PIXEL_CENTROID, FIRST_VALUE_AT_PIXEL_CENTROID, LAST_VALUE_AT_PIXEL_CENTROID, FIRST_NON_NULL_VALUE_AT_PIXEL_CENTROID
+ The first series of METHODs return statistics about the intersection of the footprint of each pixel:
+
+  * with any kind of coverage, returning value frequencies: COUNT_OF_VALUES, COUNT_OF_DISTINCT_VALUES, COUNT_OF_MOST_FREQUENT_VALUE, COUNT_OF_LEAST_FREQUENT_VALUE
+
+  * with any kind of coverage, returning brute (in opposition to weighted) stats on values: FIRST_VALUE, LAST_VALUE, MOST_FREQUENT_VALUE, LEAST_FREQUENT_VALUE, MIN_VALUE, MAX_VALUE, RANGE_OF_VALUES, SUM_OF_VALUES, MEAN_OF_VALUES, STDDEV_OF_VALUES
+
+  * with a line coverage, returning length stats: FIRST_LENGTH, LAST_LENGTH, MIN_LENGTH, MAX_LENGTH, RANGE_OF_LENGTHS, SUM_OF_LENGTHS, MEAN_OF_LENGTHS, STDDEV_OF_LENGTHS
+
+  * with a line coverage, returning stats on length of merged lines (having the same value): MIN_LENGTH_OF_MERGED_LINES, MAX_LENGTH_OF_MERGED_LINES, RANGE_OF_LENGTHS_OF_MERGED_LINES, MEAN_LENGTH_OF_MERGED_LINES, STDDEV_LENGTH_OF_MERGED_LINES, TOTAL_LENGTH_OF_LINES_HAVING_GREATEST_VALUE, TOTAL_LENGTH_OF_LINE_HAVING_SMALLEST_VALUE, TOTAL_LENGTH_OF_LINE_WITH_MOST_FREQUENT_VALUE, TOTAL_LENGTH_OF_LINE_WITH_LEAST_FREQUENT_VALUE
+
+  * with a line coverage, returning the value of lines having some special lengths: VALUE_OF_LONGEST, VALUE_OF_SHORTEST, VALUE_OF_MERGED_LONGEST, VALUE_OF_MERGED_SHORTEST
+
+  * with a line coverage, returning the value of lines weighted by their lengths: LENGTH_WEIGHTED_SUM_OF_VALUES, LENGTH_WEIGHTED_MEAN_OF_VALUES, LENGTH_WEIGHTED_STDDEV_OF_VALUES
+
+  * with a polygon coverage, returning area stats: FIRST_AREA, LAST_AREA, MIN_AREA, MAX_AREA, RANGE_OF_AREAS, SUM_OF_AREAS, MEAN_OF_AREAS, STDDEV_OF_AREAS
+
+  * with a polygon coverage, returning stats on area of merged polygons (having the same value): MIN_AREA_OF_MERGED_POLYGONS, MAX_AREA_OF_MERGED_POLYGONS, RANGE_OF_AREAS_OF_MERGED_POLYGONS, MEAN_AREA_OF_MERGED_POLYGONS, STDDEV_AREA_OF_MERGED_POLYGONS, TOTAL_AREA_OF_POLYGONS_HAVING_GREATEST_VALUE, TOTAL_AREA_OF_POLYGON_HAVING_SMALLEST_VALUE, TOTAL_AREA_OF_POLYGON_WITH_MOST_FREQUENT_VALUE, TOTAL_AREA_OF_POLYGON_WITH_LEAST_FREQUENT_VALUE
+
+  * with a polygon coverage, returning the value of polygons having some special areas: VALUE_OF_BIGGEST, VALUE_OF_SMALLEST, VALUE_OF_MERGED_BIGGEST, VALUE_OF_MERGED_SMALLEST
+
+  * with a polygon coverage, returning the value of polygons weighted by their areas: AREA_WEIGHTED_SUM_OF_VALUES, AREA_WEIGHTED_MEAN_OF_VALUES, AREA_WEIGHTED_STDDEV_OF_VALUES
+
+ The second series of METHODs return statistics about the intersection of the centroids of each pixel:
+
+  * with any kind of coverage, returning value frequencies: COUNT_OF_VALUES_AT_PIXEL_CENTROID, COUNT_OF_DISTINCT_VALUES_AT_PIXEL_CENTROID, COUNT_OF_MOST_FREQUENT_VALUE_AT_PIXEL_CENTROID, COUNT_OF_LEAST_FREQUENT_VALUE_AT_PIXEL_CENTROID
+
+  * with any kind of coverage, returning brute (in opposition to weighted) stats on values: FIRST_VALUE_AT_PIXEL_CENTROID, LAST_VALUE_AT_PIXEL_CENTROID, MOST_FREQUENT_VALUE_AT_PIXEL_CENTROID, LEAST_FREQUENT_VALUE_AT_PIXEL_CENTROID, MIN_VALUE_AT_PIXEL_CENTROID, MAX_VALUE_AT_PIXEL_CENTROID, RANGE_OF_VALUES_AT_PIXEL_CENTROID, SUM_OF_VALUES_AT_PIXEL_CENTROID, MEAN_OF_VALUES_AT_PIXEL_CENTROID, STDDEV_OF_VALUES_AT_PIXEL_CENTROID
+
 
   * ST_GeomToRaster(rast, 'schemaname', 'tablename', 'geomolumnname', 'METHOD') - A variant of ST_GeomToRaster() accepting an already defined raster. This is the equivalent to a variant of ST_UnionToRaster(rast, set of geometry, ...) described in Objective FV.19 but not an aggregate and faster while we wait for a faster ST_Union().