Using Open Source GIS - Revision history

Neteler at 20:38, 9 September 2007

2007-09-09T20:38:30Z

2006-09-21T16:00:08Z

Spatial problems

2006-09-21T15:59:44Z

Spatial problems

2006-09-21T06:19:49Z

Map making

2006-09-21T06:19:27Z

Map making

2006-09-21T06:16:02Z

Spatial descriptions

2006-09-21T06:03:52Z

Spatial problems

2006-09-21T06:02:35Z

Spatial problems

2006-09-21T06:01:30Z

Spatial problems

2006-09-21T06:00:47Z

Spatial problems

← Older revision		Revision as of 20:38, 9 September 2007
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	*Problem: Compute the total area of polygons in a dataset		*Problem: Compute the total area of polygons in a dataset
		+
		+	[[Category:Education]]

@@ Line 44: / Line 44: @@
 # knowing what there is on some location,
 # are there others?
 === Spatial descriptions ===

@@ Line 34: / Line 34: @@
 # finding where something is,
 #* we may not know the something we want to find explicitly, we may also just know something about it
-# finding the best path between two known locations,
+# network problems
-#* the "best" may also mean "at least one", and it can be interpreted as the shortest, fastest, most beautiful, etc
+## finding the best path between two known locations,
 # finding the optimal location for something,
 #* the "location" and the "something" may be a point, a line, or an area
@@ Line 42: / Line 44: @@
 # knowing what there is on some location,
 # are there others?
 === Spatial descriptions ===

@@ Line 51: / Line 51: @@
 === Map making ===
-The general problem of map making is creating a representation of an area. The GIS divides this into two parts: # creating a database of geospatial data and
+The general problem of map making is creating a representation of an area. The GIS divides this into two parts:
 # creating an image from this data.
 The power of GIS is in this separation but also in the possibility to link the two parts into an interactive system.

@@ Line 51: / Line 51: @@
 === Map making ===
-The general problem of map making is creating a representation of an area. The GIS divides this into two parts: (i) creating a database of geospatial data and (ii) creating an image from this data. The power of GIS is in this separation but also in the possibility to link the two parts into an interactive system. The first part immediately raises the question: "what is on the area and how do the things that there are relate to each other?". The second part raises the question: "what kind of image to create, i.e, how do we judge what kind of image is good?".
+The general problem of map making is creating a representation of an area. The GIS divides this into two parts: # creating a database of geospatial data and
 === GIS tool categories ===

@@ Line 45: / Line 45: @@
 === Spatial descriptions ===
-When formulating spatial problems, we may need to formulate our knowledge or wishes also spatially. For example in problem (i), if we want to find a red car on an area, the problem is spatial only in the general sense, but if we want to find a red car which is on a parking lot, then also the description of what we want to find is spatial. Spatial descriptions are attributes of spatial objects (or locations. Spatial descriptions of objects (or associated objects) may describe shape, orientation, associations, amount, or patterns. Spatial descriptions of locations (or associated locations) may describe dimension (0,1,2), shape, orientation.
+When formulating spatial problems, we may need to formulate our knowledge or wishes also spatially. For example in problem (i), if we want to find a red car on an area, the problem is spatial only in the general sense, but if we want to find a red car which is on a parking lot, then also the description of what we want to find is spatial, in this case a spatial association between two spatial objects.
 === Map making ===

@@ Line 31: / Line 31: @@
 === Spatial problems ===
-General spatial problems are: (i) finding where something is, (ii) finding the best path between two known locations, (iii) finding the optimal location for something, (iv) (this is perhaps the most fundamental one) knowing where one is, (v) knowing what there is on some location, and are there others? In the first problem we may not know the something we want to find explicitly, we may also just know something about it. In the second problem the "best" may also mean "at least one", and it can be interpreted as the shortest, fastest, most beautiful, etc. In the third problem the "something" may be a point, a line, or an area. In the fourth problem the location and orientation are not known, also knowing what is in one's neighborhood is a part of this problem.
+General spatial problems are:
 === Spatial descriptions ===