Changes between Version 46 and Version 47 of PostGIS_Raster_SoC_Idea_2012/Distance_Analysis_Tools

Timestamp:

Jun 18, 2012, 10:39:00 PM (12 years ago)

Author:

qliu

Comment:

—

PostGIS_Raster_SoC_Idea_2012/Distance_Analysis_Tools

@@ -487 +487 @@
      Generate one single raster (rectan) in which pixel values represent the Euclidean distance from the center of the pixels to the center of its nearest source point.
    * Proposed Algorithm:
-     * Scan through pixels, compute the KNN index for each pixel to its nearest source point, assign Euclidean distance using the coordinates of the center of the pixel and the center of its nearest source point (d(dx,dy) = sqrt(dx^2 + dy^2)).  If distance exceed max_distance specified, NoData value is used instead.
+     * Scan through pixels, compute the KNN index for each pixel to its nearest source point, assign Euclidean distance using the coordinates of the center of the pixel and the center of its nearest source point (d(dx,dy) = sqrt(dx^2^ + dy^2^)).  If distance exceed max_distance specified, NoData value is used instead.
      * Create a single raster with distance as pixel value (ST_RasterFromText()?) using dimensions and georeferencing information specified
    * Scalability: