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v0.2.48..v0.2.49 changeset generate alpha shape.asciidoc
Garret Voltz edited this page Oct 2, 2019
·
1 revision
diff --git a/docs/commands/generate-alpha-shape.asciidoc b/docs/commands/generate-alpha-shape.asciidoc
index b02900e..20ba311 100644
--- a/docs/commands/generate-alpha-shape.asciidoc
+++ b/docs/commands/generate-alpha-shape.asciidoc
@@ -13,24 +13,18 @@ can be found in the _Cookie Cutter_ section of <<hootalgo, Hootenanny - Algorith
There is a brief PowerPoint available on the subject
https://insightcloud.digitalglobe.com/redmine/attachments/download/1144/Hootenanny%20-%20Alpha%20Shape%202013-03-07.pptx[here].
-* +points+ - The input data to use for deriving the alpha shape. The alpha shape
- algorithm is used to derive a polygon representing the bounds. The inputs may
- be a +.osm.pbf+, +.osm+ or +.shp+ file
-* +alpha+ - The size in meters used for alpha. A larger value makes a smoother
- shape and a smaller value will create a rough shape with more holes. Value in
- meters.
-* +buffer+ - The buffer to add to the alpha shape before cutting. A negative
- value will make the shape smaller. Value in meters. Generally a buffer of zero
- will be used. If using the alpha shape command with cookie cutter it is a good
- idea to use a larger negative value on complex data shapes. This will limit
- the number of holes in the data. A negative value equal to the alpha value is
- a good rule of thumb.
-* +output+ - The output +.osm.pbf+ or +.shp+ data path.
-
-When output to a +.osm+ file the alpha shape will always be a multi-polygon with
-one attribute +area=yes+. When output as a Shapefile it will be a multipolygon
-shapefile with a single record. Hootenanny doesn't support relations in
-+.osm.pbf+ files.
+* +points+ - The input data to use for deriving the alpha shape; may be any supported input format (e.g. OSM file). The alpha shape algorithm
+ is used to derive a polygon representing the bounds.
+* +alpha+ - The size in meters used for alpha. A larger value makes a smoother shape and a smaller value will create a rough shape with more
+ holes. Value in meters.
+* +buffer+ - The buffer to add to the alpha shape before cutting. A negative value will make the shape smaller. Value in meters. Generally a
+ buffer of zero will be used. If using the alpha shape command with cookie cutter it is a good idea to use a larger negative value
+ on complex data shapes. This will limit the number of holes in the data. A negative value equal to the alpha value is a good rule
+ of thumb.
+* +output+ - The output; may be any supported output format (e.g. OSM file).
+
+When output to a +.osm+ file the alpha shape will always be a multi-polygon with one attribute +area=yes+. When output as a Shapefile it will
+be a multipolygon shapefile with a single record. Hootenanny doesn't support relations in +.osm.pbf+ files.
=== Usage
@@ -50,4 +44,5 @@ hoot generate-alpha-shape CapitalHeightsBuildings.shp 200 0 CapitalHeightsShape.
* `cookie.cutter.*` configuration options
* _Horizontal Conflation_, <<hootalgo,Hootenanny - Algorithms>>
+* https://github.com/ngageoint/hootenanny/blob/master/docs/user/SupportedDataFormats.asciidoc#applying-changes-1[Supported Input Formats]