Hot answers tagged gvsig
36
There are at least two different kinds of heat maps:
Heatmaps representing concentration of points, and
Heatmaps representing distributions of attribute values
Every method has advantages and problems, I'm afraid going into detail is far beyond this Q&A.
I'll try to list some methods and functions for QGIS and GRASS.
Concentration of points
If you ...
14
While I like heat maps, I realize they are often mis-used.
Typically what I've seen is a process whereby the color of each pixel is based on the result of an inverse distance weighted function applied to a collection of points. Any time a map has a lot of overlapping point markers, I think it is worth considering a heatmap.
Here's a web based api.
...
6
Statistically, here is how you should go about doing a heat map:
1) Integrate point features. The idea of integration is to take points that should be considered coincident and merge them together as a single location. I like to use nearest neighbor analysis and use an appropriate value from there. (For example, when doing a crime heat map, I use the ...
6
For simple heat maps and generating countour lines I've used QGis with the Grass intergration:
Load data-points
Load a limiting shape – eg county boundary
Create a Grass mapset
Open the Grass toolbox and click on the module list to search for each tool
Load v.in.ogr.qgis module and load both the point data and the boundary shape, each time remembering to ...
6
Refractions Research has made a Line Cleaner tool that seems to do what you want.
Line Cleaner cleanses networks by simplifying complex, cyclical, very
short and zero-length geometries, and removing pseudo-nodes and
insignificant vertexes. Most significantly, in the cleansing phase, it
is able to ensure that feature matches can be considered ...
4
I have no experience with gvSig or Kosmo, however I programmed applications for uDig and reused components of Openjump.
From a software engineering perspective uDig proposes a neat platfor supported by Eclipse, an universal tool for serious developers. However, developing for uDig is cumbersome precisely because of the important role the Eclipse framework ...
4
Here a generic soluion, that you can impĺement with PostGIS or any other OGC-compliant software.
NOTE: as I say before, a key concept in FOSS and GIS is standardization: the best solutions adopt standards, like OGC ones.
Your problem is to "find pseudo nodes"... But I think that it is a little more, "find non-pseudo nodes and join lines of pseudo ...
3
If you have trouble accessing the preferences (I can imagine that if your interface is in Russian) you can just edit your $HOME/gvSIG/andami-config.xml where you have to change the value of the attribute "locale-language" to "en" for example. See screenshot:
3
Relima;
I've had this same quest for a while now, I've managed to do it relatively easy with Kosmo in X simple steps:
Convert dwg to dwg 2000 with Teigha File Converter fro the Open Design Alliance;
Open this dwg in Kosmo;
Save it as an ESRI Shape file, as you mention it will create 2 or 3 shapes point, polygons and lines;
Select elements by the field ...
3
Consider ogr2ogr ( http://www.gdal.org/ogr2ogr.html ) for future data conversion needs. It is part of the ogr ( http://www.gdal.org/ogr/ ) project. This is a command line utility to will convert to/from just about anything ( http://www.gdal.org/ogr/ogr_formats.html ).
From the website:
"This program can be used to convert simple features data between file ...
2
As suggested by simo, I posted this question onto gvSIG mailing list and got the following answers/links:
This discussion archive can also be read in context at Nabble: gvSIG advantages
gvsig uses sextante as raster processing framework.
Take a look at what you can do with it:
http://sextantegis.blogspot.com/,
http://sextante.forge.osor.eu/
...
2
That's true, it seems there is not much gvSIG users here.
I have no good reply regarding your question but :
first, you can have a good overview of gvsig features on wikipedia : http://en.wikipedia.org/wiki/GvSIG#Features_gvSIG_Desktop
I would give you the advice to browse gvSIG archives on nabble and maybe to cross-post your question also there! At ...
2
gvSIG uses the same CRS library than QGis, is called Proj4.
In order to load the data you have to:
Create a view in 26971 EPSG code (I guess). See http://i.imagebanana.com/img/ardsef2u/20130304115816Seleccin.png
Load your data and go to the change source transformation. See http://i.imagebanana.com/img/jwjchwo6/20130304120019Seleccin.png
Select the EPSG ...
1
You are using gvSIG 1.10, have you tried to update to 1.12? Here you have some instructions for MacOS
http://gvsigmac.blogspot.com.es/2012/07/gvsig-112-for-mac-107-and-108.html
You can also ask Agustín there, he's very nice and helpful.
1
If you get the "wide" version, you see coordinates in lat/lon, which is distorted. To get a right picture, you can set almost every projected as project CRS suited for your area. With a UTM or a global projection like Google Mercator EPSG:3857 give a silimar picture. The layer CRS still remains to be lat/lon EPSG:4326.
It should not matter whether you do it ...
1
Here are steps to Find your pseudo nodes using OpenJump a free GIS.
QGIS and gvSIG have the Sextante Plugin, so these same steps should work their too,
the Spatial Join might be slightly different.
I used version 1.2 for testing.
-- save the Line endpoints
Sextante toolbox, Topology, Extract endpoints of lines -> endpt_0
-- unsplit your lines
Sextante ...
1
I have found it a little hard to find good documentation on gvSIG. Main development is in spanish so for those of us who are used to english documentation it is a new experience. Quite often the manual are not completely translated.
What I know is that gvSIG forked a while ago and formed gvSIG CE. I dont really know why but it seems that there was some kind ...
1
That manual is really old and outdated.
If you want to set up a gvSIG 1.x workspace you can check this. It's not updated for 1.12 but more or less the process is OK.
If you want to develop with gvSIG 2.0 then you have two situations, it's not the same to develop a gvSIG plugin than working with the core. For the first case you don't need to set up a ...
1
Disclaimer: I'm part of the gvSIG team :-)
gvSIG 2.0 is a very modular application so you can develop new extension to gvSIG desktop (the most usual use case) or create complete new J2SE apps using gvSIG components.
There is a quick start guide for developers that is being translated and updated those days. If you have any question don't hesitate to ask at ...
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